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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Dmitry Torokhov <dmitry.torokhov@gmail.com>,
        "David S. Miller" <davem@davemloft.net>,
        Ben Hutchings <ben.hutchings@codethink.co.uk>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.9 35/90] ptp: use is_visible method to hide unused attributes
Date:   Mon, 18 May 2020 19:36:13 +0200
Message-Id: <20200518173458.246665640@linuxfoundation.org>
In-Reply-To: <20200518173450.930655662@linuxfoundation.org>
References: <20200518173450.930655662@linuxfoundation.org>
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From: Dmitry Torokhov <dmitry.torokhov@gmail.com>

commit af59e717d5ff9c8dbf9bcc581c0dfb3b2a9c9030 upstream.

Instead of creating selected attributes after the device is created (and
after userspace potentially seen uevent), lets use attribute group
is_visible() method to control which attributes are shown. This will allow
us to create all attributes (except "pins" group, which will be taken care
of later) before userspace gets notified about new ptp class device.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/ptp/ptp_sysfs.c | 125 ++++++++++++++++++----------------------
 1 file changed, 55 insertions(+), 70 deletions(-)

diff --git a/drivers/ptp/ptp_sysfs.c b/drivers/ptp/ptp_sysfs.c
index 302e626fe6b01..a55a6eb4dfde9 100644
--- a/drivers/ptp/ptp_sysfs.c
+++ b/drivers/ptp/ptp_sysfs.c
@@ -46,27 +46,6 @@ PTP_SHOW_INT(n_periodic_outputs, n_per_out);
 PTP_SHOW_INT(n_programmable_pins, n_pins);
 PTP_SHOW_INT(pps_available, pps);
 
-static struct attribute *ptp_attrs[] = {
-	&dev_attr_clock_name.attr,
-	&dev_attr_max_adjustment.attr,
-	&dev_attr_n_alarms.attr,
-	&dev_attr_n_external_timestamps.attr,
-	&dev_attr_n_periodic_outputs.attr,
-	&dev_attr_n_programmable_pins.attr,
-	&dev_attr_pps_available.attr,
-	NULL,
-};
-
-static const struct attribute_group ptp_group = {
-	.attrs = ptp_attrs,
-};
-
-const struct attribute_group *ptp_groups[] = {
-	&ptp_group,
-	NULL,
-};
-
-
 static ssize_t extts_enable_store(struct device *dev,
 				  struct device_attribute *attr,
 				  const char *buf, size_t count)
@@ -91,6 +70,7 @@ static ssize_t extts_enable_store(struct device *dev,
 out:
 	return err;
 }
+static DEVICE_ATTR(extts_enable, 0220, NULL, extts_enable_store);
 
 static ssize_t extts_fifo_show(struct device *dev,
 			       struct device_attribute *attr, char *page)
@@ -124,6 +104,7 @@ out:
 	mutex_unlock(&ptp->tsevq_mux);
 	return cnt;
 }
+static DEVICE_ATTR(fifo, 0444, extts_fifo_show, NULL);
 
 static ssize_t period_store(struct device *dev,
 			    struct device_attribute *attr,
@@ -151,6 +132,7 @@ static ssize_t period_store(struct device *dev,
 out:
 	return err;
 }
+static DEVICE_ATTR(period, 0220, NULL, period_store);
 
 static ssize_t pps_enable_store(struct device *dev,
 				struct device_attribute *attr,
@@ -177,6 +159,57 @@ static ssize_t pps_enable_store(struct device *dev,
 out:
 	return err;
 }
+static DEVICE_ATTR(pps_enable, 0220, NULL, pps_enable_store);
+
+static struct attribute *ptp_attrs[] = {
+	&dev_attr_clock_name.attr,
+
+	&dev_attr_max_adjustment.attr,
+	&dev_attr_n_alarms.attr,
+	&dev_attr_n_external_timestamps.attr,
+	&dev_attr_n_periodic_outputs.attr,
+	&dev_attr_n_programmable_pins.attr,
+	&dev_attr_pps_available.attr,
+
+	&dev_attr_extts_enable.attr,
+	&dev_attr_fifo.attr,
+	&dev_attr_period.attr,
+	&dev_attr_pps_enable.attr,
+	NULL
+};
+
+static umode_t ptp_is_attribute_visible(struct kobject *kobj,
+					struct attribute *attr, int n)
+{
+	struct device *dev = kobj_to_dev(kobj);
+	struct ptp_clock *ptp = dev_get_drvdata(dev);
+	struct ptp_clock_info *info = ptp->info;
+	umode_t mode = attr->mode;
+
+	if (attr == &dev_attr_extts_enable.attr ||
+	    attr == &dev_attr_fifo.attr) {
+		if (!info->n_ext_ts)
+			mode = 0;
+	} else if (attr == &dev_attr_period.attr) {
+		if (!info->n_per_out)
+			mode = 0;
+	} else if (attr == &dev_attr_pps_enable.attr) {
+		if (!info->pps)
+			mode = 0;
+	}
+
+	return mode;
+}
+
+static const struct attribute_group ptp_group = {
+	.is_visible	= ptp_is_attribute_visible,
+	.attrs		= ptp_attrs,
+};
+
+const struct attribute_group *ptp_groups[] = {
+	&ptp_group,
+	NULL
+};
 
 static int ptp_pin_name2index(struct ptp_clock *ptp, const char *name)
 {
@@ -235,26 +268,11 @@ static ssize_t ptp_pin_store(struct device *dev, struct device_attribute *attr,
 	return count;
 }
 
-static DEVICE_ATTR(extts_enable, 0220, NULL, extts_enable_store);
-static DEVICE_ATTR(fifo,         0444, extts_fifo_show, NULL);
-static DEVICE_ATTR(period,       0220, NULL, period_store);
-static DEVICE_ATTR(pps_enable,   0220, NULL, pps_enable_store);
-
 int ptp_cleanup_sysfs(struct ptp_clock *ptp)
 {
 	struct device *dev = ptp->dev;
 	struct ptp_clock_info *info = ptp->info;
 
-	if (info->n_ext_ts) {
-		device_remove_file(dev, &dev_attr_extts_enable);
-		device_remove_file(dev, &dev_attr_fifo);
-	}
-	if (info->n_per_out)
-		device_remove_file(dev, &dev_attr_period);
-
-	if (info->pps)
-		device_remove_file(dev, &dev_attr_pps_enable);
-
 	if (info->n_pins) {
 		sysfs_remove_group(&dev->kobj, &ptp->pin_attr_group);
 		kfree(ptp->pin_attr);
@@ -307,46 +325,13 @@ no_dev_attr:
 
 int ptp_populate_sysfs(struct ptp_clock *ptp)
 {
-	struct device *dev = ptp->dev;
 	struct ptp_clock_info *info = ptp->info;
 	int err;
 
-	if (info->n_ext_ts) {
-		err = device_create_file(dev, &dev_attr_extts_enable);
-		if (err)
-			goto out1;
-		err = device_create_file(dev, &dev_attr_fifo);
-		if (err)
-			goto out2;
-	}
-	if (info->n_per_out) {
-		err = device_create_file(dev, &dev_attr_period);
-		if (err)
-			goto out3;
-	}
-	if (info->pps) {
-		err = device_create_file(dev, &dev_attr_pps_enable);
-		if (err)
-			goto out4;
-	}
 	if (info->n_pins) {
 		err = ptp_populate_pins(ptp);
 		if (err)
-			goto out5;
+			return err;
 	}
 	return 0;
-out5:
-	if (info->pps)
-		device_remove_file(dev, &dev_attr_pps_enable);
-out4:
-	if (info->n_per_out)
-		device_remove_file(dev, &dev_attr_period);
-out3:
-	if (info->n_ext_ts)
-		device_remove_file(dev, &dev_attr_fifo);
-out2:
-	if (info->n_ext_ts)
-		device_remove_file(dev, &dev_attr_extts_enable);
-out1:
-	return err;
 }
-- 
2.20.1