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From: Ricardo Ribalda <ribalda@chromium.org>
Date: Thu, 11 Apr 2024 21:17:55 +0000
Subject: [PATCH 6/7] media: dvb-frontends: drx39xyj: Refactor firmware
 upload
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Message-Id: <20240411-fix-smatch-v1-6-045f92467937@chromium.org>
References: <20240411-fix-smatch-v1-0-045f92467937@chromium.org>
In-Reply-To: <20240411-fix-smatch-v1-0-045f92467937@chromium.org>
To: Bluecherry Maintainers <maintainers@bluecherrydvr.com>, 
 Anton Sviridenko <anton@corp.bluecherry.net>, 
 Andrey Utkin <andrey_utkin@fastmail.com>, 
 Ismael Luceno <ismael@iodev.co.uk>, 
 Mauro Carvalho Chehab <mchehab@kernel.org>, 
 Patrice Chotard <patrice.chotard@foss.st.com>
Cc: Hans Verkuil <hverkuil-cisco@xs4all.nl>, linux-media@vger.kernel.org, 
 linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, 
 Ricardo Ribalda <ribalda@chromium.org>

Do not cache the file, instead load it on demand.

This makes smatch a happy parser:
drivers/media/dvb-frontends/drx39xyj/drxj.c:11908 drx_ctrl_u_code() warn: 'fw' from request_firmware() not released on lines: 11877,11886,11896.

Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
 drivers/media/dvb-frontends/drx39xyj/drx_driver.h |  2 -
 drivers/media/dvb-frontends/drx39xyj/drxj.c       | 49 +++++++++++------------
 2 files changed, 23 insertions(+), 28 deletions(-)

diff --git a/drivers/media/dvb-frontends/drx39xyj/drx_driver.h b/drivers/media/dvb-frontends/drx39xyj/drx_driver.h
index 15f7e58c5a308..2c2fd4bf79ccf 100644
--- a/drivers/media/dvb-frontends/drx39xyj/drx_driver.h
+++ b/drivers/media/dvb-frontends/drx39xyj/drx_driver.h
@@ -33,7 +33,6 @@
 
 #include <linux/kernel.h>
 #include <linux/errno.h>
-#include <linux/firmware.h>
 #include <linux/i2c.h>
 
 /*
@@ -1910,7 +1909,6 @@ struct drx_demod_instance {
 	/* generic demodulator data */
 
 	struct i2c_adapter	*i2c;
-	const struct firmware	*firmware;
 };
 
 /*-------------------------------------------------------------------------
diff --git a/drivers/media/dvb-frontends/drx39xyj/drxj.c b/drivers/media/dvb-frontends/drx39xyj/drxj.c
index 19d8de400a687..1ef53754bc037 100644
--- a/drivers/media/dvb-frontends/drx39xyj/drxj.c
+++ b/drivers/media/dvb-frontends/drx39xyj/drxj.c
@@ -56,6 +56,7 @@ INCLUDE FILES
 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
 
 #include <linux/module.h>
+#include <linux/firmware.h>
 #include <linux/init.h>
 #include <linux/string.h>
 #include <linux/slab.h>
@@ -11750,6 +11751,7 @@ static int drx_ctrl_u_code(struct drx_demod_instance *demod,
 	u8 *mc_data = NULL;
 	unsigned size;
 	char *mc_file;
+	const struct firmware *fw;
 
 	/* Check arguments */
 	if (!mc_info || !mc_info->mc_file)
@@ -11757,28 +11759,22 @@ static int drx_ctrl_u_code(struct drx_demod_instance *demod,
 
 	mc_file = mc_info->mc_file;
 
-	if (!demod->firmware) {
-		const struct firmware *fw = NULL;
-
-		rc = request_firmware(&fw, mc_file, demod->i2c->dev.parent);
-		if (rc < 0) {
-			pr_err("Couldn't read firmware %s\n", mc_file);
-			return rc;
-		}
-		demod->firmware = fw;
-
-		if (demod->firmware->size < 2 * sizeof(u16)) {
-			rc = -EINVAL;
-			pr_err("Firmware is too short!\n");
-			goto release;
-		}
+	rc = request_firmware(&fw, mc_file, demod->i2c->dev.parent);
+	if (rc < 0) {
+		pr_err("Couldn't read firmware %s\n", mc_file);
+		return rc;
+	}
 
-		pr_info("Firmware %s, size %zu\n",
-			mc_file, demod->firmware->size);
+	if (fw->size < 2 * sizeof(u16)) {
+		rc = -EINVAL;
+		pr_err("Firmware is too short!\n");
+		goto release;
 	}
 
-	mc_data_init = demod->firmware->data;
-	size = demod->firmware->size;
+	pr_info("Firmware %s, size %zu\n", mc_file, fw->size);
+
+	mc_data_init = fw->data;
+	size = fw->size;
 
 	mc_data = (void *)mc_data_init;
 	/* Check data */
@@ -11874,7 +11870,8 @@ static int drx_ctrl_u_code(struct drx_demod_instance *demod,
 						    0x0000)) {
 					pr_err("error reading firmware at pos %zd\n",
 					       mc_data - mc_data_init);
-					return -EIO;
+					rc = -EIO;
+					goto release;
 				}
 
 				result = memcmp(curr_ptr, mc_data_buffer,
@@ -11883,7 +11880,8 @@ static int drx_ctrl_u_code(struct drx_demod_instance *demod,
 				if (result) {
 					pr_err("error verifying firmware at pos %zd\n",
 					       mc_data - mc_data_init);
-					return -EIO;
+					rc = -EIO;
+					goto release;
 				}
 
 				curr_addr += ((dr_xaddr_t)(bytes_to_comp / 2));
@@ -11893,17 +11891,17 @@ static int drx_ctrl_u_code(struct drx_demod_instance *demod,
 			break;
 		}
 		default:
-			return -EINVAL;
+			rc = -EINVAL;
+			goto release;
 
 		}
 		mc_data += mc_block_nr_bytes;
 	}
 
-	return 0;
+	rc = 0;
 
 release:
-	release_firmware(demod->firmware);
-	demod->firmware = NULL;
+	release_firmware(fw);
 
 	return rc;
 }
@@ -12271,7 +12269,6 @@ static void drx39xxj_release(struct dvb_frontend *fe)
 	kfree(demod->my_ext_attr);
 	kfree(demod->my_common_attr);
 	kfree(demod->my_i2c_dev_addr);
-	release_firmware(demod->firmware);
 	kfree(demod);
 	kfree(state);
 }

-- 
2.44.0.683.g7961c838ac-goog