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From: Jens Axboe <axboe@kernel.dk>
To: linux-kernel@vger.kernel.org
Cc: Jens Axboe <axboe@kernel.dk>
Subject: [PATCH 291/437] drivers/net/wireless/marvell: convert to read/write iterators
Date: Thu, 11 Apr 2024 09:17:11 -0600
Message-ID: <20240411153126.16201-292-axboe@kernel.dk>
In-Reply-To: <20240411153126.16201-1-axboe@kernel.dk>
References: <20240411153126.16201-1-axboe@kernel.dk>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit

Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 .../net/wireless/marvell/libertas/debugfs.c   | 242 +++++++-----------
 .../net/wireless/marvell/mwifiex/debugfs.c    | 183 ++++++-------
 2 files changed, 172 insertions(+), 253 deletions(-)

diff --git a/drivers/net/wireless/marvell/libertas/debugfs.c b/drivers/net/wireless/marvell/libertas/debugfs.c
index c604613ab506..0a5a2084b0d6 100644
--- a/drivers/net/wireless/marvell/libertas/debugfs.c
+++ b/drivers/net/wireless/marvell/libertas/debugfs.c
@@ -22,18 +22,16 @@ static char *szStates[] = {
 static void lbs_debug_init(struct lbs_private *priv);
 #endif
 
-static ssize_t write_file_dummy(struct file *file, const char __user *buf,
-                                size_t count, loff_t *ppos)
+static ssize_t write_file_dummy(struct kiocb *iocb, struct iov_iter *from)
 {
         return -EINVAL;
 }
 
 static const size_t len = PAGE_SIZE;
 
-static ssize_t lbs_dev_info(struct file *file, char __user *userbuf,
-				  size_t count, loff_t *ppos)
+static ssize_t lbs_dev_info(struct kiocb *iocb, struct iov_iter *to)
 {
-	struct lbs_private *priv = file->private_data;
+	struct lbs_private *priv = iocb->ki_filp->private_data;
 	size_t pos = 0;
 	unsigned long addr = get_zeroed_page(GFP_KERNEL);
 	char *buf = (char *)addr;
@@ -46,23 +44,22 @@ static ssize_t lbs_dev_info(struct file *file, char __user *userbuf,
 	pos += snprintf(buf+pos, len-pos, "region_code = %02x\n",
 				(u32) priv->regioncode);
 
-	res = simple_read_from_buffer(userbuf, count, ppos, buf, pos);
+	res = simple_copy_to_iter(buf, &iocb->ki_pos, pos, to);
 
 	free_page(addr);
 	return res;
 }
 
-static ssize_t lbs_sleepparams_write(struct file *file,
-				const char __user *user_buf, size_t count,
-				loff_t *ppos)
+static ssize_t lbs_sleepparams_write(struct kiocb *iocb, struct iov_iter *from)
 {
-	struct lbs_private *priv = file->private_data;
+	struct lbs_private *priv = iocb->ki_filp->private_data;
+	size_t count = iov_iter_count(from);
 	ssize_t ret;
 	struct sleep_params sp;
 	int p1, p2, p3, p4, p5, p6;
 	char *buf;
 
-	buf = memdup_user_nul(user_buf, min(count, len - 1));
+	buf = iterdup_nul(from, min(count, len - 1));
 	if (IS_ERR(buf))
 		return PTR_ERR(buf);
 
@@ -89,10 +86,9 @@ static ssize_t lbs_sleepparams_write(struct file *file,
 	return ret;
 }
 
-static ssize_t lbs_sleepparams_read(struct file *file, char __user *userbuf,
-				  size_t count, loff_t *ppos)
+static ssize_t lbs_sleepparams_read(struct kiocb *iocb, struct iov_iter *to)
 {
-	struct lbs_private *priv = file->private_data;
+	struct lbs_private *priv = iocb->ki_filp->private_data;
 	ssize_t ret;
 	size_t pos = 0;
 	struct sleep_params sp;
@@ -110,23 +106,22 @@ static ssize_t lbs_sleepparams_read(struct file *file, char __user *userbuf,
 			sp.sp_calcontrol, sp.sp_extsleepclk,
 			sp.sp_reserved);
 
-	ret = simple_read_from_buffer(userbuf, count, ppos, buf, pos);
+	ret = simple_copy_to_iter(buf, &iocb->ki_pos, pos, to);
 
 out_unlock:
 	free_page(addr);
 	return ret;
 }
 
-static ssize_t lbs_host_sleep_write(struct file *file,
-				const char __user *user_buf, size_t count,
-				loff_t *ppos)
+static ssize_t lbs_host_sleep_write(struct kiocb *iocb, struct iov_iter *from)
 {
-	struct lbs_private *priv = file->private_data;
+	struct lbs_private *priv = iocb->ki_filp->private_data;
+	size_t count = iov_iter_count(from);
 	ssize_t ret;
 	int host_sleep;
 	char *buf;
 
-	buf = memdup_user_nul(user_buf, min(count, len - 1));
+	buf = iterdup_nul(from, min(count, len - 1));
 	if (IS_ERR(buf))
 		return PTR_ERR(buf);
 
@@ -159,10 +154,9 @@ static ssize_t lbs_host_sleep_write(struct file *file,
 	return ret;
 }
 
-static ssize_t lbs_host_sleep_read(struct file *file, char __user *userbuf,
-				  size_t count, loff_t *ppos)
+static ssize_t lbs_host_sleep_read(struct kiocb *iocb, struct iov_iter *to)
 {
-	struct lbs_private *priv = file->private_data;
+	struct lbs_private *priv = iocb->ki_filp->private_data;
 	ssize_t ret;
 	size_t pos = 0;
 	unsigned long addr = get_zeroed_page(GFP_KERNEL);
@@ -172,7 +166,7 @@ static ssize_t lbs_host_sleep_read(struct file *file, char __user *userbuf,
 
 	pos += snprintf(buf, len, "%d\n", priv->is_host_sleep_activated);
 
-	ret = simple_read_from_buffer(userbuf, count, ppos, buf, pos);
+	ret = simple_copy_to_iter(buf, &iocb->ki_pos, pos, to);
 
 	free_page(addr);
 	return ret;
@@ -215,12 +209,11 @@ static void *lbs_tlv_find(uint16_t tlv_type, const uint8_t *tlv, uint16_t size)
 
 
 static ssize_t lbs_threshold_read(uint16_t tlv_type, uint16_t event_mask,
-				  struct file *file, char __user *userbuf,
-				  size_t count, loff_t *ppos)
+				  struct kiocb *iocb, struct iov_iter *to)
 {
 	struct cmd_ds_802_11_subscribe_event *subscribed;
 	struct mrvl_ie_thresholds *got;
-	struct lbs_private *priv = file->private_data;
+	struct lbs_private *priv = iocb->ki_filp->private_data;
 	ssize_t ret = 0;
 	size_t pos = 0;
 	char *buf;
@@ -255,7 +248,7 @@ static ssize_t lbs_threshold_read(uint16_t tlv_type, uint16_t event_mask,
 				!!(events & event_mask));
 	}
 
-	ret = simple_read_from_buffer(userbuf, count, ppos, buf, pos);
+	ret = simple_copy_to_iter(buf, &iocb->ki_pos, pos, to);
 
  out_cmd:
 	kfree(subscribed);
@@ -267,19 +260,18 @@ static ssize_t lbs_threshold_read(uint16_t tlv_type, uint16_t event_mask,
 
 
 static ssize_t lbs_threshold_write(uint16_t tlv_type, uint16_t event_mask,
-				   struct file *file,
-				   const char __user *userbuf, size_t count,
-				   loff_t *ppos)
+				   struct kiocb *iocb, struct iov_iter *from)
 {
 	struct cmd_ds_802_11_subscribe_event *events;
 	struct mrvl_ie_thresholds *tlv;
-	struct lbs_private *priv = file->private_data;
+	struct lbs_private *priv = iocb->ki_filp->private_data;
+	size_t count = iov_iter_count(from);
 	int value, freq, new_mask;
 	uint16_t curr_mask;
 	char *buf;
 	int ret;
 
-	buf = memdup_user_nul(userbuf, min(count, len - 1));
+	buf = iterdup_nul(from, min(count, len - 1));
 	if (IS_ERR(buf))
 		return PTR_ERR(buf);
 
@@ -335,105 +327,81 @@ static ssize_t lbs_threshold_write(uint16_t tlv_type, uint16_t event_mask,
 }
 
 
-static ssize_t lbs_lowrssi_read(struct file *file, char __user *userbuf,
-				size_t count, loff_t *ppos)
+static ssize_t lbs_lowrssi_read(struct kiocb *iocb, struct iov_iter *to)
 {
 	return lbs_threshold_read(TLV_TYPE_RSSI_LOW, CMD_SUBSCRIBE_RSSI_LOW,
-				  file, userbuf, count, ppos);
+				  iocb, to);
 }
 
-
-static ssize_t lbs_lowrssi_write(struct file *file, const char __user *userbuf,
-				 size_t count, loff_t *ppos)
+static ssize_t lbs_lowrssi_write(struct kiocb *iocb, struct iov_iter *from)
 {
 	return lbs_threshold_write(TLV_TYPE_RSSI_LOW, CMD_SUBSCRIBE_RSSI_LOW,
-				   file, userbuf, count, ppos);
+				   iocb, from);
 }
 
-
-static ssize_t lbs_lowsnr_read(struct file *file, char __user *userbuf,
-			       size_t count, loff_t *ppos)
+static ssize_t lbs_lowsnr_read(struct kiocb *iocb, struct iov_iter *to)
 {
 	return lbs_threshold_read(TLV_TYPE_SNR_LOW, CMD_SUBSCRIBE_SNR_LOW,
-				  file, userbuf, count, ppos);
+				  iocb, to);
 }
 
-
-static ssize_t lbs_lowsnr_write(struct file *file, const char __user *userbuf,
-				size_t count, loff_t *ppos)
+static ssize_t lbs_lowsnr_write(struct kiocb *iocb, struct iov_iter *from)
 {
 	return lbs_threshold_write(TLV_TYPE_SNR_LOW, CMD_SUBSCRIBE_SNR_LOW,
-				   file, userbuf, count, ppos);
+				   iocb, from);
 }
 
-
-static ssize_t lbs_failcount_read(struct file *file, char __user *userbuf,
-				  size_t count, loff_t *ppos)
+static ssize_t lbs_failcount_read(struct kiocb *iocb, struct iov_iter *to)
 {
 	return lbs_threshold_read(TLV_TYPE_FAILCOUNT, CMD_SUBSCRIBE_FAILCOUNT,
-				  file, userbuf, count, ppos);
+				  iocb, to);
 }
 
-
-static ssize_t lbs_failcount_write(struct file *file, const char __user *userbuf,
-				   size_t count, loff_t *ppos)
+static ssize_t lbs_failcount_write(struct kiocb *iocb, struct iov_iter *from)
 {
 	return lbs_threshold_write(TLV_TYPE_FAILCOUNT, CMD_SUBSCRIBE_FAILCOUNT,
-				   file, userbuf, count, ppos);
+				   iocb, from);
 }
 
-
-static ssize_t lbs_highrssi_read(struct file *file, char __user *userbuf,
-				 size_t count, loff_t *ppos)
+static ssize_t lbs_highrssi_read(struct kiocb *iocb, struct iov_iter *to)
 {
 	return lbs_threshold_read(TLV_TYPE_RSSI_HIGH, CMD_SUBSCRIBE_RSSI_HIGH,
-				  file, userbuf, count, ppos);
+				  iocb, to);
 }
 
-
-static ssize_t lbs_highrssi_write(struct file *file, const char __user *userbuf,
-				  size_t count, loff_t *ppos)
+static ssize_t lbs_highrssi_write(struct kiocb *iocb, struct iov_iter *from)
 {
 	return lbs_threshold_write(TLV_TYPE_RSSI_HIGH, CMD_SUBSCRIBE_RSSI_HIGH,
-				   file, userbuf, count, ppos);
+				   iocb, from);
 }
 
-
-static ssize_t lbs_highsnr_read(struct file *file, char __user *userbuf,
-				size_t count, loff_t *ppos)
+static ssize_t lbs_highsnr_read(struct kiocb *iocb, struct iov_iter *to)
 {
 	return lbs_threshold_read(TLV_TYPE_SNR_HIGH, CMD_SUBSCRIBE_SNR_HIGH,
-				  file, userbuf, count, ppos);
+				  iocb, to);
 }
 
-
-static ssize_t lbs_highsnr_write(struct file *file, const char __user *userbuf,
-				 size_t count, loff_t *ppos)
+static ssize_t lbs_highsnr_write(struct kiocb *iocb, struct iov_iter *from)
 {
 	return lbs_threshold_write(TLV_TYPE_SNR_HIGH, CMD_SUBSCRIBE_SNR_HIGH,
-				   file, userbuf, count, ppos);
+				   iocb, from);
 }
 
-static ssize_t lbs_bcnmiss_read(struct file *file, char __user *userbuf,
-				size_t count, loff_t *ppos)
+static ssize_t lbs_bcnmiss_read(struct kiocb *iocb, struct iov_iter *to)
 {
 	return lbs_threshold_read(TLV_TYPE_BCNMISS, CMD_SUBSCRIBE_BCNMISS,
-				  file, userbuf, count, ppos);
+				  iocb, to);
 }
 
-
-static ssize_t lbs_bcnmiss_write(struct file *file, const char __user *userbuf,
-				 size_t count, loff_t *ppos)
+static ssize_t lbs_bcnmiss_write(struct kiocb *iocb, struct iov_iter *from)
 {
 	return lbs_threshold_write(TLV_TYPE_BCNMISS, CMD_SUBSCRIBE_BCNMISS,
-				   file, userbuf, count, ppos);
+				   iocb, from);
 }
 
-
-static ssize_t lbs_rdmac_read(struct file *file, char __user *userbuf,
-				  size_t count, loff_t *ppos)
+static ssize_t lbs_rdmac_read(struct kiocb *iocb, struct iov_iter *to)
 {
-	struct lbs_private *priv = file->private_data;
+	struct lbs_private *priv = iocb->ki_filp->private_data;
 	ssize_t pos = 0;
 	int ret;
 	unsigned long addr = get_zeroed_page(GFP_KERNEL);
@@ -448,20 +416,19 @@ static ssize_t lbs_rdmac_read(struct file *file, char __user *userbuf,
 	if (!ret) {
 		pos = snprintf(buf, len, "MAC[0x%x] = 0x%08x\n",
 				priv->mac_offset, val);
-		ret = simple_read_from_buffer(userbuf, count, ppos, buf, pos);
+		ret = simple_copy_to_iter(buf, &iocb->ki_pos, pos, to);
 	}
 	free_page(addr);
 	return ret;
 }
 
-static ssize_t lbs_rdmac_write(struct file *file,
-				    const char __user *userbuf,
-				    size_t count, loff_t *ppos)
+static ssize_t lbs_rdmac_write(struct kiocb *iocb, struct iov_iter *from)
 {
-	struct lbs_private *priv = file->private_data;
+	struct lbs_private *priv = iocb->ki_filp->private_data;
+	size_t count = iov_iter_count(from);
 	char *buf;
 
-	buf = memdup_user_nul(userbuf, min(count, len - 1));
+	buf = iterdup_nul(from, min(count, len - 1));
 	if (IS_ERR(buf))
 		return PTR_ERR(buf);
 
@@ -470,17 +437,15 @@ static ssize_t lbs_rdmac_write(struct file *file,
 	return count;
 }
 
-static ssize_t lbs_wrmac_write(struct file *file,
-				    const char __user *userbuf,
-				    size_t count, loff_t *ppos)
+static ssize_t lbs_wrmac_write(struct kiocb *iocb, struct iov_iter *from)
 {
-
-	struct lbs_private *priv = file->private_data;
+	struct lbs_private *priv = iocb->ki_filp->private_data;
+	size_t count = iov_iter_count(from);
 	ssize_t res;
 	u32 offset, value;
 	char *buf;
 
-	buf = memdup_user_nul(userbuf, min(count, len - 1));
+	buf = iterdup_nul(from, min(count, len - 1));
 	if (IS_ERR(buf))
 		return PTR_ERR(buf);
 
@@ -500,10 +465,9 @@ static ssize_t lbs_wrmac_write(struct file *file,
 	return res;
 }
 
-static ssize_t lbs_rdbbp_read(struct file *file, char __user *userbuf,
-				  size_t count, loff_t *ppos)
+static ssize_t lbs_rdbbp_read(struct kiocb *iocb, struct iov_iter *to)
 {
-	struct lbs_private *priv = file->private_data;
+	struct lbs_private *priv = iocb->ki_filp->private_data;
 	ssize_t pos = 0;
 	int ret;
 	unsigned long addr = get_zeroed_page(GFP_KERNEL);
@@ -518,21 +482,20 @@ static ssize_t lbs_rdbbp_read(struct file *file, char __user *userbuf,
 	if (!ret) {
 		pos = snprintf(buf, len, "BBP[0x%x] = 0x%08x\n",
 				priv->bbp_offset, val);
-		ret = simple_read_from_buffer(userbuf, count, ppos, buf, pos);
+		ret = simple_copy_to_iter(buf, &iocb->ki_pos, pos, to);
 	}
 	free_page(addr);
 
 	return ret;
 }
 
-static ssize_t lbs_rdbbp_write(struct file *file,
-				    const char __user *userbuf,
-				    size_t count, loff_t *ppos)
+static ssize_t lbs_rdbbp_write(struct kiocb *iocb, struct iov_iter *from)
 {
-	struct lbs_private *priv = file->private_data;
+	struct lbs_private *priv = iocb->ki_filp->private_data;
+	size_t count = iov_iter_count(from);
 	char *buf;
 
-	buf = memdup_user_nul(userbuf, min(count, len - 1));
+	buf = iterdup_nul(from, min(count, len - 1));
 	if (IS_ERR(buf))
 		return PTR_ERR(buf);
 
@@ -542,17 +505,15 @@ static ssize_t lbs_rdbbp_write(struct file *file,
 	return count;
 }
 
-static ssize_t lbs_wrbbp_write(struct file *file,
-				    const char __user *userbuf,
-				    size_t count, loff_t *ppos)
+static ssize_t lbs_wrbbp_write(struct kiocb *iocb, struct iov_iter *from)
 {
-
-	struct lbs_private *priv = file->private_data;
+	struct lbs_private *priv = iocb->ki_filp->private_data;
+	size_t count = iov_iter_count(from);
 	ssize_t res;
 	u32 offset, value;
 	char *buf;
 
-	buf = memdup_user_nul(userbuf, min(count, len - 1));
+	buf = iterdup_nul(from, min(count, len - 1));
 	if (IS_ERR(buf))
 		return PTR_ERR(buf);
 
@@ -572,10 +533,9 @@ static ssize_t lbs_wrbbp_write(struct file *file,
 	return res;
 }
 
-static ssize_t lbs_rdrf_read(struct file *file, char __user *userbuf,
-				  size_t count, loff_t *ppos)
+static ssize_t lbs_rdrf_read(struct kiocb *iocb, struct iov_iter *to)
 {
-	struct lbs_private *priv = file->private_data;
+	struct lbs_private *priv = iocb->ki_filp->private_data;
 	ssize_t pos = 0;
 	int ret;
 	unsigned long addr = get_zeroed_page(GFP_KERNEL);
@@ -590,21 +550,20 @@ static ssize_t lbs_rdrf_read(struct file *file, char __user *userbuf,
 	if (!ret) {
 		pos = snprintf(buf, len, "RF[0x%x] = 0x%08x\n",
 				priv->rf_offset, val);
-		ret = simple_read_from_buffer(userbuf, count, ppos, buf, pos);
+		ret = simple_copy_to_iter(buf, &iocb->ki_pos, pos, to);
 	}
 	free_page(addr);
 
 	return ret;
 }
 
-static ssize_t lbs_rdrf_write(struct file *file,
-				    const char __user *userbuf,
-				    size_t count, loff_t *ppos)
+static ssize_t lbs_rdrf_write(struct kiocb *iocb, struct iov_iter *from)
 {
-	struct lbs_private *priv = file->private_data;
+	struct lbs_private *priv = iocb->ki_filp->private_data;
+	size_t count = iov_iter_count(from);
 	char *buf;
 
-	buf = memdup_user_nul(userbuf, min(count, len - 1));
+	buf = iterdup_nul(from, min(count, len - 1));
 	if (IS_ERR(buf))
 		return PTR_ERR(buf);
 
@@ -613,17 +572,15 @@ static ssize_t lbs_rdrf_write(struct file *file,
 	return count;
 }
 
-static ssize_t lbs_wrrf_write(struct file *file,
-				    const char __user *userbuf,
-				    size_t count, loff_t *ppos)
+static ssize_t lbs_wrrf_write(struct kiocb *iocb, struct iov_iter *from)
 {
-
-	struct lbs_private *priv = file->private_data;
+	struct lbs_private *priv = iocb->ki_filp->private_data;
+	size_t count = iov_iter_count(from);
 	ssize_t res;
 	u32 offset, value;
 	char *buf;
 
-	buf = memdup_user_nul(userbuf, min(count, len - 1));
+	buf = iterdup_nul(from, min(count, len - 1));
 	if (IS_ERR(buf))
 		return PTR_ERR(buf);
 
@@ -646,8 +603,8 @@ static ssize_t lbs_wrrf_write(struct file *file,
 #define FOPS(fread, fwrite) { \
 	.owner = THIS_MODULE, \
 	.open = simple_open, \
-	.read = (fread), \
-	.write = (fwrite), \
+	.read_iter = (fread), \
+	.write_iter = (fwrite), \
 	.llseek = generic_file_llseek, \
 }
 
@@ -796,15 +753,12 @@ static int num_of_items = ARRAY_SIZE(items);
 /**
  * lbs_debugfs_read - proc read function
  *
- * @file:	file to read
- * @userbuf:	pointer to buffer
- * @count:	number of bytes to read
- * @ppos:	read data starting position
+ * @iocb:	metadata for IO
+ * @to:		iov_iter to copy to
  *
  * returns:	amount of data read or negative error code
  */
-static ssize_t lbs_debugfs_read(struct file *file, char __user *userbuf,
-			size_t count, loff_t *ppos)
+static ssize_t lbs_debugfs_read(struct kiocb *iocb, struct iov_iter *to)
 {
 	int val = 0;
 	size_t pos = 0;
@@ -819,7 +773,7 @@ static ssize_t lbs_debugfs_read(struct file *file, char __user *userbuf,
 
 	p = buf;
 
-	d = file->private_data;
+	d = iocb->ki_filp->private_data;
 
 	for (i = 0; i < num_of_items; i++) {
 		if (d[i].size == 1)
@@ -834,7 +788,7 @@ static ssize_t lbs_debugfs_read(struct file *file, char __user *userbuf,
 		pos += sprintf(p + pos, "%s=%d\n", d[i].name, val);
 	}
 
-	res = simple_read_from_buffer(userbuf, count, ppos, p, pos);
+	res = simple_copy_to_iter(p, &iocb->ki_pos, pos, to);
 
 	free_page(addr);
 	return res;
@@ -843,28 +797,26 @@ static ssize_t lbs_debugfs_read(struct file *file, char __user *userbuf,
 /**
  * lbs_debugfs_write - proc write function
  *
- * @f:		file pointer
- * @buf:	pointer to data buffer
- * @cnt:	data number to write
- * @ppos:	file position
+ * @iocb:	metadata for IO
+ * @from:	iov_iter to cooy from
  *
  * returns:	amount of data written
  */
-static ssize_t lbs_debugfs_write(struct file *f, const char __user *buf,
-			    size_t cnt, loff_t *ppos)
+static ssize_t lbs_debugfs_write(struct kiocb *iocb, struct iov_iter *from)
 {
+	size_t cnt = iov_iter_count(from);
 	int r, i;
 	char *pdata;
 	char *p;
 	char *p0;
 	char *p1;
 	char *p2;
-	struct debug_data *d = f->private_data;
+	struct debug_data *d = iocb->ki_filp->private_data;
 
 	if (cnt == 0)
 		return 0;
 
-	pdata = memdup_user_nul(buf, cnt);
+	pdata = iterdup_nul(from, cnt);
 	if (IS_ERR(pdata))
 		return PTR_ERR(pdata);
 
@@ -902,8 +854,8 @@ static ssize_t lbs_debugfs_write(struct file *f, const char __user *buf,
 static const struct file_operations lbs_debug_fops = {
 	.owner = THIS_MODULE,
 	.open = simple_open,
-	.write = lbs_debugfs_write,
-	.read = lbs_debugfs_read,
+	.write_iter = lbs_debugfs_write,
+	.read_iter = lbs_debugfs_read,
 	.llseek = default_llseek,
 };
 
diff --git a/drivers/net/wireless/marvell/mwifiex/debugfs.c b/drivers/net/wireless/marvell/mwifiex/debugfs.c
index 9deaf59dcb62..ad94780582e2 100644
--- a/drivers/net/wireless/marvell/mwifiex/debugfs.c
+++ b/drivers/net/wireless/marvell/mwifiex/debugfs.c
@@ -58,12 +58,9 @@ static char *bss_modes[] = {
  *      - Multicast count
  *      - Multicast addresses
  */
-static ssize_t
-mwifiex_info_read(struct file *file, char __user *ubuf,
-		  size_t count, loff_t *ppos)
+static ssize_t mwifiex_info_read(struct kiocb *iocb, struct iov_iter *to)
 {
-	struct mwifiex_private *priv =
-		(struct mwifiex_private *) file->private_data;
+	struct mwifiex_private *priv = iocb->ki_filp->private_data;
 	struct net_device *netdev = priv->netdev;
 	struct netdev_hw_addr *ha;
 	struct netdev_queue *txq;
@@ -133,8 +130,8 @@ mwifiex_info_read(struct file *file, char __user *ubuf,
 	}
 	p += sprintf(p, "\n");
 
-	ret = simple_read_from_buffer(ubuf, count, ppos, (char *) page,
-				      (unsigned long) p - page);
+	ret = simple_copy_to_iter((char *) page, &iocb->ki_pos,
+				      (unsigned long) p - page, to);
 
 free_and_exit:
 	free_page(page);
@@ -162,12 +159,9 @@ mwifiex_info_read(struct file *file, char __user *ubuf,
  *      - Number of received beacons
  *      - Number of missed beacons
  */
-static ssize_t
-mwifiex_getlog_read(struct file *file, char __user *ubuf,
-		    size_t count, loff_t *ppos)
+static ssize_t mwifiex_getlog_read(struct kiocb *iocb, struct iov_iter *to)
 {
-	struct mwifiex_private *priv =
-		(struct mwifiex_private *) file->private_data;
+	struct mwifiex_private *priv = iocb->ki_filp->private_data;
 	unsigned long page = get_zeroed_page(GFP_KERNEL);
 	char *p = (char *) page;
 	ssize_t ret;
@@ -220,8 +214,8 @@ mwifiex_getlog_read(struct file *file, char __user *ubuf,
 		     stats.bcn_miss_cnt);
 
 
-	ret = simple_read_from_buffer(ubuf, count, ppos, (char *) page,
-				      (unsigned long) p - page);
+	ret = simple_copy_to_iter((char *) page, &iocb->ki_pos,
+				      (unsigned long) p - page, to);
 
 free_and_exit:
 	free_page(page);
@@ -238,12 +232,9 @@ mwifiex_getlog_read(struct file *file, char __user *ubuf,
  *      - Receive packet number of each nosie_flr
  *      - Receive packet number of each signal streath
  */
-static ssize_t
-mwifiex_histogram_read(struct file *file, char __user *ubuf,
-		       size_t count, loff_t *ppos)
+static ssize_t mwifiex_histogram_read(struct kiocb *iocb, struct iov_iter *to)
 {
-	struct mwifiex_private *priv =
-		(struct mwifiex_private *)file->private_data;
+	struct mwifiex_private *priv = iocb->ki_filp->private_data;
 	ssize_t ret;
 	struct mwifiex_histogram_data *phist_data;
 	int i, value;
@@ -309,8 +300,8 @@ mwifiex_histogram_read(struct file *file, char __user *ubuf,
 				i, value);
 	}
 
-	ret = simple_read_from_buffer(ubuf, count, ppos, (char *)page,
-				      (unsigned long)p - page);
+	ret = simple_copy_to_iter((char *)page, &iocb->ki_pos,
+				      (unsigned long)p - page, to);
 
 free_and_exit:
 	free_page(page);
@@ -318,10 +309,9 @@ mwifiex_histogram_read(struct file *file, char __user *ubuf,
 }
 
 static ssize_t
-mwifiex_histogram_write(struct file *file, const char __user *ubuf,
-			size_t count, loff_t *ppos)
+mwifiex_histogram_write(struct kiocb *iocb, struct iov_iter *from)
 {
-	struct mwifiex_private *priv = (void *)file->private_data;
+	struct mwifiex_private *priv = iocb->ki_filp->private_data;
 
 	if (priv && priv->hist_data)
 		mwifiex_hist_data_reset(priv);
@@ -377,12 +367,9 @@ static struct mwifiex_debug_info info;
  *      - Tx BA stream table (TID, RA)
  *      - Rx reorder table (TID, TA, Start window, Window size, Buffer)
  */
-static ssize_t
-mwifiex_debug_read(struct file *file, char __user *ubuf,
-		   size_t count, loff_t *ppos)
+static ssize_t mwifiex_debug_read(struct kiocb *iocb, struct iov_iter *to)
 {
-	struct mwifiex_private *priv =
-		(struct mwifiex_private *) file->private_data;
+	struct mwifiex_private *priv = iocb->ki_filp->private_data;
 	unsigned long page = get_zeroed_page(GFP_KERNEL);
 	char *p = (char *) page;
 	ssize_t ret;
@@ -396,8 +383,8 @@ mwifiex_debug_read(struct file *file, char __user *ubuf,
 
 	p += mwifiex_debug_info_to_buffer(priv, p, &info);
 
-	ret = simple_read_from_buffer(ubuf, count, ppos, (char *) page,
-				      (unsigned long) p - page);
+	ret = simple_copy_to_iter((char *) page, &iocb->ki_pos,
+				      (unsigned long) p - page, to);
 
 free_and_exit:
 	free_page(page);
@@ -414,14 +401,14 @@ static u32 saved_reg_type, saved_reg_offset, saved_reg_value;
  * This function can be used to write to a register.
  */
 static ssize_t
-mwifiex_regrdwr_write(struct file *file,
-		      const char __user *ubuf, size_t count, loff_t *ppos)
+mwifiex_regrdwr_write(struct kiocb *iocb, struct iov_iter *from)
 {
 	char *buf;
 	int ret;
 	u32 reg_type = 0, reg_offset = 0, reg_value = UINT_MAX;
+	size_t count = iov_iter_count(from);
 
-	buf = memdup_user_nul(ubuf, min(count, (size_t)(PAGE_SIZE - 1)));
+	buf = iterdup_nul(from, min(count, (size_t)(PAGE_SIZE - 1)));
 	if (IS_ERR(buf))
 		return PTR_ERR(buf);
 
@@ -451,12 +438,9 @@ mwifiex_regrdwr_write(struct file *file,
  *
  * This function can be used to read from a register.
  */
-static ssize_t
-mwifiex_regrdwr_read(struct file *file, char __user *ubuf,
-		     size_t count, loff_t *ppos)
+static ssize_t mwifiex_regrdwr_read(struct kiocb *iocb, struct iov_iter *to)
 {
-	struct mwifiex_private *priv =
-		(struct mwifiex_private *) file->private_data;
+	struct mwifiex_private *priv = iocb->ki_filp->private_data;
 	unsigned long addr = get_zeroed_page(GFP_KERNEL);
 	char *buf = (char *) addr;
 	int pos = 0, ret = 0;
@@ -479,7 +463,7 @@ mwifiex_regrdwr_read(struct file *file, char __user *ubuf,
 				saved_reg_type, saved_reg_offset,
 				saved_reg_value);
 
-		ret = simple_read_from_buffer(ubuf, count, ppos, buf, pos);
+		ret = simple_copy_to_iter(buf, &iocb->ki_pos, pos, to);
 
 		goto done;
 	}
@@ -494,7 +478,7 @@ mwifiex_regrdwr_read(struct file *file, char __user *ubuf,
 	pos += snprintf(buf, PAGE_SIZE, "%u 0x%x 0x%x\n", saved_reg_type,
 			saved_reg_offset, reg_value);
 
-	ret = simple_read_from_buffer(ubuf, count, ppos, buf, pos);
+	ret = simple_copy_to_iter(buf, &iocb->ki_pos, pos, to);
 
 done:
 	free_page(addr);
@@ -506,11 +490,9 @@ mwifiex_regrdwr_read(struct file *file, char __user *ubuf,
  * This function can be used read driver debugging mask value.
  */
 static ssize_t
-mwifiex_debug_mask_read(struct file *file, char __user *ubuf,
-			size_t count, loff_t *ppos)
+mwifiex_debug_mask_read(struct kiocb *iocb, struct iov_iter *to)
 {
-	struct mwifiex_private *priv =
-		(struct mwifiex_private *)file->private_data;
+	struct mwifiex_private *priv = iocb->ki_filp->private_data;
 	unsigned long page = get_zeroed_page(GFP_KERNEL);
 	char *buf = (char *)page;
 	size_t ret = 0;
@@ -521,7 +503,7 @@ mwifiex_debug_mask_read(struct file *file, char __user *ubuf,
 
 	pos += snprintf(buf, PAGE_SIZE, "debug mask=0x%08x\n",
 			priv->adapter->debug_mask);
-	ret = simple_read_from_buffer(ubuf, count, ppos, buf, pos);
+	ret = simple_copy_to_iter(buf, &iocb->ki_pos, pos, to);
 
 	free_page(page);
 	return ret;
@@ -532,15 +514,15 @@ mwifiex_debug_mask_read(struct file *file, char __user *ubuf,
  * This function can be used read driver debugging mask value.
  */
 static ssize_t
-mwifiex_debug_mask_write(struct file *file, const char __user *ubuf,
-			 size_t count, loff_t *ppos)
+mwifiex_debug_mask_write(struct kiocb *iocb, struct iov_iter *from)
 {
 	int ret;
 	unsigned long debug_mask;
-	struct mwifiex_private *priv = (void *)file->private_data;
+	struct mwifiex_private *priv = iocb->ki_filp->private_data;
+	size_t count = iov_iter_count(from);
 	char *buf;
 
-	buf = memdup_user_nul(ubuf, min(count, (size_t)(PAGE_SIZE - 1)));
+	buf = iterdup_nul(from, min(count, (size_t)(PAGE_SIZE - 1)));
 	if (IS_ERR(buf))
 		return PTR_ERR(buf);
 
@@ -559,15 +541,14 @@ mwifiex_debug_mask_write(struct file *file, const char __user *ubuf,
 /* debugfs verext file write handler.
  * This function is called when the 'verext' file is opened for write
  */
-static ssize_t
-mwifiex_verext_write(struct file *file, const char __user *ubuf,
-		     size_t count, loff_t *ppos)
+static ssize_t mwifiex_verext_write(struct kiocb *iocb, struct iov_iter *from)
 {
 	int ret;
 	u32 versionstrsel;
-	struct mwifiex_private *priv = (void *)file->private_data;
+	struct mwifiex_private *priv = iocb->ki_filp->private_data;
+	size_t count = iov_iter_count(from);
 
-	ret = kstrtou32_from_user(ubuf, count, 10, &versionstrsel);
+	ret = kstrtou32_from_iter(from, count, 10, &versionstrsel);
 	if (ret)
 		return ret;
 
@@ -581,11 +562,9 @@ mwifiex_verext_write(struct file *file, const char __user *ubuf,
  * This function can be used read driver exteneed verion string.
  */
 static ssize_t
-mwifiex_verext_read(struct file *file, char __user *ubuf,
-		    size_t count, loff_t *ppos)
+mwifiex_verext_read(struct kiocb *iocb, struct iov_iter *to)
 {
-	struct mwifiex_private *priv =
-		(struct mwifiex_private *)file->private_data;
+	struct mwifiex_private *priv = iocb->ki_filp->private_data;
 	char buf[256];
 	int ret;
 
@@ -593,25 +572,24 @@ mwifiex_verext_read(struct file *file, char __user *ubuf,
 	ret = snprintf(buf, sizeof(buf), "version string: %s\n",
 		       priv->version_str);
 
-	return simple_read_from_buffer(ubuf, count, ppos, buf, ret);
+	return simple_copy_to_iter(buf, &iocb->ki_pos, ret, to);
 }
 
 /* Proc memrw file write handler.
  * This function is called when the 'memrw' file is opened for writing
  * This function can be used to write to a memory location.
  */
-static ssize_t
-mwifiex_memrw_write(struct file *file, const char __user *ubuf, size_t count,
-		    loff_t *ppos)
+static ssize_t mwifiex_memrw_write(struct kiocb *iocb, struct iov_iter *from)
 {
 	int ret;
 	char cmd;
 	struct mwifiex_ds_mem_rw mem_rw;
 	u16 cmd_action;
-	struct mwifiex_private *priv = (void *)file->private_data;
+	struct mwifiex_private *priv = iocb->ki_filp->private_data;
+	size_t count = iov_iter_count(from);
 	char *buf;
 
-	buf = memdup_user_nul(ubuf, min(count, (size_t)(PAGE_SIZE - 1)));
+	buf = iterdup_nul(from, min(count, (size_t)(PAGE_SIZE - 1)));
 	if (IS_ERR(buf))
 		return PTR_ERR(buf);
 
@@ -647,11 +625,9 @@ mwifiex_memrw_write(struct file *file, const char __user *ubuf, size_t count,
  * This function is called when the 'memrw' file is opened for reading
  * This function can be used to read from a memory location.
  */
-static ssize_t
-mwifiex_memrw_read(struct file *file, char __user *ubuf,
-		   size_t count, loff_t *ppos)
+static ssize_t mwifiex_memrw_read(struct kiocb *iocb, struct iov_iter *to)
 {
-	struct mwifiex_private *priv = (void *)file->private_data;
+	struct mwifiex_private *priv = iocb->ki_filp->private_data;
 	unsigned long addr = get_zeroed_page(GFP_KERNEL);
 	char *buf = (char *)addr;
 	int ret, pos = 0;
@@ -661,7 +637,7 @@ mwifiex_memrw_read(struct file *file, char __user *ubuf,
 
 	pos += snprintf(buf, PAGE_SIZE, "0x%x 0x%x\n", priv->mem_rw.addr,
 			priv->mem_rw.value);
-	ret = simple_read_from_buffer(ubuf, count, ppos, buf, pos);
+	ret = simple_copy_to_iter(buf, &iocb->ki_pos, pos, to);
 
 	free_page(addr);
 	return ret;
@@ -676,15 +652,14 @@ static u32 saved_offset = -1, saved_bytes = -1;
  *
  * This function can be used to write to a RDEEPROM location.
  */
-static ssize_t
-mwifiex_rdeeprom_write(struct file *file,
-		       const char __user *ubuf, size_t count, loff_t *ppos)
+static ssize_t mwifiex_rdeeprom_write(struct kiocb *iocb, struct iov_iter *from)
 {
 	char *buf;
 	int ret = 0;
 	int offset = -1, bytes = -1;
+	size_t count = iov_iter_count(from);
 
-	buf = memdup_user_nul(ubuf, min(count, (size_t)(PAGE_SIZE - 1)));
+	buf = iterdup_nul(from, min(count, (size_t)(PAGE_SIZE - 1)));
 	if (IS_ERR(buf))
 		return PTR_ERR(buf);
 
@@ -713,12 +688,9 @@ mwifiex_rdeeprom_write(struct file *file,
  *
  * This function can be used to read from a RDEEPROM location.
  */
-static ssize_t
-mwifiex_rdeeprom_read(struct file *file, char __user *ubuf,
-		      size_t count, loff_t *ppos)
+static ssize_t mwifiex_rdeeprom_read(struct kiocb *iocb, struct iov_iter *to)
 {
-	struct mwifiex_private *priv =
-		(struct mwifiex_private *) file->private_data;
+	struct mwifiex_private *priv = iocb->ki_filp->private_data;
 	unsigned long addr = get_zeroed_page(GFP_KERNEL);
 	char *buf = (char *) addr;
 	int pos, ret, i;
@@ -747,7 +719,7 @@ mwifiex_rdeeprom_read(struct file *file, char __user *ubuf,
 		pos += scnprintf(buf + pos, PAGE_SIZE - pos, "%d ", value[i]);
 
 done:
-	ret = simple_read_from_buffer(ubuf, count, ppos, buf, pos);
+	ret = simple_copy_to_iter(buf, &iocb->ki_pos, pos, to);
 out_free:
 	free_page(addr);
 	return ret;
@@ -756,18 +728,17 @@ mwifiex_rdeeprom_read(struct file *file, char __user *ubuf,
 /* Proc hscfg file write handler
  * This function can be used to configure the host sleep parameters.
  */
-static ssize_t
-mwifiex_hscfg_write(struct file *file, const char __user *ubuf,
-		    size_t count, loff_t *ppos)
+static ssize_t mwifiex_hscfg_write(struct kiocb *iocb, struct iov_iter *from)
 {
-	struct mwifiex_private *priv = (void *)file->private_data;
+	struct mwifiex_private *priv = iocb->ki_filp->private_data;
+	size_t count = iov_iter_count(from);
 	char *buf;
 	int ret, arg_num;
 	struct mwifiex_ds_hs_cfg hscfg;
 	int conditions = HS_CFG_COND_DEF;
 	u32 gpio = HS_CFG_GPIO_DEF, gap = HS_CFG_GAP_DEF;
 
-	buf = memdup_user_nul(ubuf, min(count, (size_t)(PAGE_SIZE - 1)));
+	buf = iterdup_nul(from, min(count, (size_t)(PAGE_SIZE - 1)));
 	if (IS_ERR(buf))
 		return PTR_ERR(buf);
 
@@ -815,11 +786,9 @@ mwifiex_hscfg_write(struct file *file, const char __user *ubuf,
  * This function can be used to read host sleep configuration
  * parameters from driver.
  */
-static ssize_t
-mwifiex_hscfg_read(struct file *file, char __user *ubuf,
-		   size_t count, loff_t *ppos)
+static ssize_t mwifiex_hscfg_read(struct kiocb *iocb, struct iov_iter *to)
 {
-	struct mwifiex_private *priv = (void *)file->private_data;
+	struct mwifiex_private *priv = iocb->ki_filp->private_data;
 	unsigned long addr = get_zeroed_page(GFP_KERNEL);
 	char *buf = (char *)addr;
 	int pos, ret;
@@ -834,17 +803,16 @@ mwifiex_hscfg_read(struct file *file, char __user *ubuf,
 	pos = snprintf(buf, PAGE_SIZE, "%u 0x%x 0x%x\n", hscfg.conditions,
 		       hscfg.gpio, hscfg.gap);
 
-	ret = simple_read_from_buffer(ubuf, count, ppos, buf, pos);
+	ret = simple_copy_to_iter(buf, &iocb->ki_pos, pos, to);
 
 	free_page(addr);
 	return ret;
 }
 
-static ssize_t
-mwifiex_timeshare_coex_read(struct file *file, char __user *ubuf,
-			    size_t count, loff_t *ppos)
+static ssize_t mwifiex_timeshare_coex_read(struct kiocb *iocb,
+					   struct iov_iter *to)
 {
-	struct mwifiex_private *priv = file->private_data;
+	struct mwifiex_private *priv = iocb->ki_filp->private_data;
 	char buf[3];
 	bool timeshare_coex;
 	int ret;
@@ -859,21 +827,21 @@ mwifiex_timeshare_coex_read(struct file *file, char __user *ubuf,
 		return ret;
 
 	len = sprintf(buf, "%d\n", timeshare_coex);
-	return simple_read_from_buffer(ubuf, count, ppos, buf, len);
+	return simple_copy_to_iter(buf, &iocb->ki_pos, len, to);
 }
 
 static ssize_t
-mwifiex_timeshare_coex_write(struct file *file, const char __user *ubuf,
-			     size_t count, loff_t *ppos)
+mwifiex_timeshare_coex_write(struct kiocb *iocb, struct iov_iter *from)
 {
 	bool timeshare_coex;
-	struct mwifiex_private *priv = file->private_data;
+	struct mwifiex_private *priv = iocb->ki_filp->private_data;
+	size_t count = iov_iter_count(from);
 	int ret;
 
 	if (priv->adapter->fw_api_ver != MWIFIEX_FW_V15)
 		return -EOPNOTSUPP;
 
-	ret = kstrtobool_from_user(ubuf, count, &timeshare_coex);
+	ret = kstrtobool_from_iter(from, count, &timeshare_coex);
 	if (ret)
 		return ret;
 
@@ -885,16 +853,15 @@ mwifiex_timeshare_coex_write(struct file *file, const char __user *ubuf,
 		return count;
 }
 
-static ssize_t
-mwifiex_reset_write(struct file *file,
-		    const char __user *ubuf, size_t count, loff_t *ppos)
+static ssize_t mwifiex_reset_write(struct kiocb *iocb, struct iov_iter *from)
 {
-	struct mwifiex_private *priv = file->private_data;
+	struct mwifiex_private *priv = iocb->ki_filp->private_data;
+	size_t count = iov_iter_count(from);
 	struct mwifiex_adapter *adapter = priv->adapter;
 	bool result;
 	int rc;
 
-	rc = kstrtobool_from_user(ubuf, count, &result);
+	rc = kstrtobool_from_iter(from, count, &result);
 	if (rc)
 		return rc;
 
@@ -916,20 +883,20 @@ mwifiex_reset_write(struct file *file,
 
 #define MWIFIEX_DFS_FILE_OPS(name)                                      \
 static const struct file_operations mwifiex_dfs_##name##_fops = {       \
-	.read = mwifiex_##name##_read,                                  \
-	.write = mwifiex_##name##_write,                                \
+	.read_iter = mwifiex_##name##_read,                             \
+	.write_iter = mwifiex_##name##_write,                           \
 	.open = simple_open,                                            \
 };
 
 #define MWIFIEX_DFS_FILE_READ_OPS(name)                                 \
 static const struct file_operations mwifiex_dfs_##name##_fops = {       \
-	.read = mwifiex_##name##_read,                                  \
+	.read_iter = mwifiex_##name##_read,                             \
 	.open = simple_open,                                            \
 };
 
 #define MWIFIEX_DFS_FILE_WRITE_OPS(name)                                \
 static const struct file_operations mwifiex_dfs_##name##_fops = {       \
-	.write = mwifiex_##name##_write,                                \
+	.write_iter = mwifiex_##name##_write,                           \
 	.open = simple_open,                                            \
 };
 
-- 
2.43.0