linux-kernel - [PATCH] media: pvrusb2: use sysfs_emit() to instead of scnprintf()

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Date:   Thu, 1 Dec 2022 19:27:59 +0800 (CST)
From:   <ye.xingchen@....com.cn>
To:     <isely@...ox.com>
Cc:     <mchehab@...nel.org>, <linux-media@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] media: pvrusb2: use sysfs_emit() to instead of scnprintf()

From: ye xingchen <ye.xingchen@....com.cn>

Follow the advice of the Documentation/filesystems/sysfs.rst and show()
should only use sysfs_emit() or sysfs_emit_at() when formatting the
value to be returned to user space.

Signed-off-by: ye xingchen <ye.xingchen@....com.cn>
---
 drivers/media/usb/pvrusb2/pvrusb2-sysfs.c | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/drivers/media/usb/pvrusb2/pvrusb2-sysfs.c b/drivers/media/usb/pvrusb2/pvrusb2-sysfs.c
index 3e42e209be37..81c8b65bd9ef 100644
--- a/drivers/media/usb/pvrusb2/pvrusb2-sysfs.c
+++ b/drivers/media/usb/pvrusb2/pvrusb2-sysfs.c
@@ -81,7 +81,7 @@ static ssize_t show_name(struct device *class_dev,
 	pvr2_sysfs_trace("pvr2_sysfs(%p) show_name(cid=%d) is %s",
 			 cip->chptr, cip->ctl_id, name);
 	if (!name) return -EINVAL;
-	return scnprintf(buf, PAGE_SIZE, "%s\n", name);
+	return sysfs_emit(buf, "%s\n", name);
 }

 static ssize_t show_type(struct device *class_dev,
@@ -102,7 +102,7 @@ static ssize_t show_type(struct device *class_dev,
 	}
 	pvr2_sysfs_trace("pvr2_sysfs(%p) show_type(cid=%d) is %s",
 			 cip->chptr, cip->ctl_id, name);
-	return scnprintf(buf, PAGE_SIZE, "%s\n", name);
+	return sysfs_emit(buf, "%s\n", name);
 }

 static ssize_t show_min(struct device *class_dev,
@@ -115,7 +115,7 @@ static ssize_t show_min(struct device *class_dev,
 	val = pvr2_ctrl_get_min(cip->cptr);
 	pvr2_sysfs_trace("pvr2_sysfs(%p) show_min(cid=%d) is %ld",
 			 cip->chptr, cip->ctl_id, val);
-	return scnprintf(buf, PAGE_SIZE, "%ld\n", val);
+	return sysfs_emit(buf, "%ld\n", val);
 }

 static ssize_t show_max(struct device *class_dev,
@@ -128,7 +128,7 @@ static ssize_t show_max(struct device *class_dev,
 	val = pvr2_ctrl_get_max(cip->cptr);
 	pvr2_sysfs_trace("pvr2_sysfs(%p) show_max(cid=%d) is %ld",
 			 cip->chptr, cip->ctl_id, val);
-	return scnprintf(buf, PAGE_SIZE, "%ld\n", val);
+	return sysfs_emit(buf, "%ld\n", val);
 }

 static ssize_t show_def(struct device *class_dev,
@@ -551,7 +551,7 @@ static ssize_t v4l_minor_number_show(struct device *class_dev,
 	struct pvr2_sysfs *sfp;
 	sfp = dev_get_drvdata(class_dev);
 	if (!sfp) return -EINVAL;
-	return scnprintf(buf,PAGE_SIZE,"%d\n",
+	return sysfs_emit(buf, "%d\n",
 			 pvr2_hdw_v4l_get_minor_number(sfp->channel.hdw,
 						       pvr2_v4l_type_video));
 }
@@ -563,7 +563,7 @@ static ssize_t bus_info_show(struct device *class_dev,
 	struct pvr2_sysfs *sfp;
 	sfp = dev_get_drvdata(class_dev);
 	if (!sfp) return -EINVAL;
-	return scnprintf(buf,PAGE_SIZE,"%s\n",
+	return sysfs_emit(buf, "%s\n",
 			 pvr2_hdw_get_bus_info(sfp->channel.hdw));
 }

@@ -574,7 +574,7 @@ static ssize_t hdw_name_show(struct device *class_dev,
 	struct pvr2_sysfs *sfp;
 	sfp = dev_get_drvdata(class_dev);
 	if (!sfp) return -EINVAL;
-	return scnprintf(buf,PAGE_SIZE,"%s\n",
+	return sysfs_emit(buf, "%s\n",
 			 pvr2_hdw_get_type(sfp->channel.hdw));
 }

@@ -585,7 +585,7 @@ static ssize_t hdw_desc_show(struct device *class_dev,
 	struct pvr2_sysfs *sfp;
 	sfp = dev_get_drvdata(class_dev);
 	if (!sfp) return -EINVAL;
-	return scnprintf(buf,PAGE_SIZE,"%s\n",
+	return sysfs_emit(buf, "%s\n",
 			 pvr2_hdw_get_desc(sfp->channel.hdw));
 }

@@ -597,7 +597,7 @@ static ssize_t v4l_radio_minor_number_show(struct device *class_dev,
 	struct pvr2_sysfs *sfp;
 	sfp = dev_get_drvdata(class_dev);
 	if (!sfp) return -EINVAL;
-	return scnprintf(buf,PAGE_SIZE,"%d\n",
+	return sysfs_emit(buf, "%d\n",
 			 pvr2_hdw_v4l_get_minor_number(sfp->channel.hdw,
 						       pvr2_v4l_type_radio));
 }
@@ -609,7 +609,7 @@ static ssize_t unit_number_show(struct device *class_dev,
 	struct pvr2_sysfs *sfp;
 	sfp = dev_get_drvdata(class_dev);
 	if (!sfp) return -EINVAL;
-	return scnprintf(buf,PAGE_SIZE,"%d\n",
+	return sysfs_emit(buf, "%d\n",
 			 pvr2_hdw_get_unit_number(sfp->channel.hdw));
 }

-- 
2.25.1