linux-kernel - [PATCH linux-next v3] fbdev: use sysfs

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Date:   Mon, 5 Dec 2022 16:31:39 +0800 (CST)
From:   <ye.xingchen@....com.cn>
To:     <deller@....de>
Cc:     <javierm@...hat.com>, <tzimmermann@...e.de>,
        <geert+renesas@...der.be>, <linux-fbdev@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH linux-next v3] fbdev: 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>
---
v2 -> v3
Fix the mistakes in v2.
 drivers/video/fbdev/sh_mobile_lcdcfb.c |  8 ++++----
 drivers/video/fbdev/uvesafb.c          | 10 +++++-----
 2 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/video/fbdev/sh_mobile_lcdcfb.c b/drivers/video/fbdev/sh_mobile_lcdcfb.c
index 6d00893d41f4..ad9323ed8e2e 100644
--- a/drivers/video/fbdev/sh_mobile_lcdcfb.c
+++ b/drivers/video/fbdev/sh_mobile_lcdcfb.c
@@ -1188,7 +1188,7 @@ overlay_alpha_show(struct device *dev, struct device_attribute *attr, char *buf)
 	struct fb_info *info = dev_get_drvdata(dev);
 	struct sh_mobile_lcdc_overlay *ovl = info->par;

-	return scnprintf(buf, PAGE_SIZE, "%u\n", ovl->alpha);
+	return sysfs_emit(buf, "%u\n", ovl->alpha);
 }

 static ssize_t
@@ -1226,7 +1226,7 @@ overlay_mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 	struct fb_info *info = dev_get_drvdata(dev);
 	struct sh_mobile_lcdc_overlay *ovl = info->par;

-	return scnprintf(buf, PAGE_SIZE, "%u\n", ovl->mode);
+	return sysfs_emit(buf, "%u\n", ovl->mode);
 }

 static ssize_t
@@ -1265,7 +1265,7 @@ overlay_position_show(struct device *dev, struct device_attribute *attr,
 	struct fb_info *info = dev_get_drvdata(dev);
 	struct sh_mobile_lcdc_overlay *ovl = info->par;

-	return scnprintf(buf, PAGE_SIZE, "%d,%d\n", ovl->pos_x, ovl->pos_y);
+	return sysfs_emit(buf, "%d,%d\n", ovl->pos_x, ovl->pos_y);
 }

 static ssize_t
@@ -1306,7 +1306,7 @@ overlay_rop3_show(struct device *dev, struct device_attribute *attr, char *buf)
 	struct fb_info *info = dev_get_drvdata(dev);
 	struct sh_mobile_lcdc_overlay *ovl = info->par;

-	return scnprintf(buf, PAGE_SIZE, "%u\n", ovl->rop3);
+	return sysfs_emit(buf, "%u\n", ovl->rop3);
 }

 static ssize_t
diff --git a/drivers/video/fbdev/uvesafb.c b/drivers/video/fbdev/uvesafb.c
index 00d789b6c0fa..ba8028a0cc7a 100644
--- a/drivers/video/fbdev/uvesafb.c
+++ b/drivers/video/fbdev/uvesafb.c
@@ -1580,7 +1580,7 @@ static ssize_t uvesafb_show_vendor(struct device *dev,
 	struct uvesafb_par *par = info->par;

 	if (par->vbe_ib.oem_vendor_name_ptr)
-		return scnprintf(buf, PAGE_SIZE, "%s\n", (char *)
+		return sysfs_emit(buf, "%s\n", (char *)
 			(&par->vbe_ib) + par->vbe_ib.oem_vendor_name_ptr);
 	else
 		return 0;
@@ -1595,7 +1595,7 @@ static ssize_t uvesafb_show_product_name(struct device *dev,
 	struct uvesafb_par *par = info->par;

 	if (par->vbe_ib.oem_product_name_ptr)
-		return scnprintf(buf, PAGE_SIZE, "%s\n", (char *)
+		return sysfs_emit(buf, "%s\n", (char *)
 			(&par->vbe_ib) + par->vbe_ib.oem_product_name_ptr);
 	else
 		return 0;
@@ -1610,7 +1610,7 @@ static ssize_t uvesafb_show_product_rev(struct device *dev,
 	struct uvesafb_par *par = info->par;

 	if (par->vbe_ib.oem_product_rev_ptr)
-		return scnprintf(buf, PAGE_SIZE, "%s\n", (char *)
+		return sysfs_emit(buf, "%s\n", (char *)
 			(&par->vbe_ib) + par->vbe_ib.oem_product_rev_ptr);
 	else
 		return 0;
@@ -1625,7 +1625,7 @@ static ssize_t uvesafb_show_oem_string(struct device *dev,
 	struct uvesafb_par *par = info->par;

 	if (par->vbe_ib.oem_string_ptr)
-		return scnprintf(buf, PAGE_SIZE, "%s\n",
+		return sysfs_emit(buf, "%s\n",
 			(char *)(&par->vbe_ib) + par->vbe_ib.oem_string_ptr);
 	else
 		return 0;
@@ -1639,7 +1639,7 @@ static ssize_t uvesafb_show_nocrtc(struct device *dev,
 	struct fb_info *info = dev_get_drvdata(dev);
 	struct uvesafb_par *par = info->par;

-	return scnprintf(buf, PAGE_SIZE, "%d\n", par->nocrtc);
+	return sysfs_emit(buf, "%d\n", par->nocrtc);
 }

 static ssize_t uvesafb_store_nocrtc(struct device *dev,
-- 
2.25.1