linux-kernel - [PATCH v3] drm/panel: tpo-td043mtea1: Convert sprintf() family to sysfs

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Message-Id: <20240319092310.1590270-1-lizhijian@fujitsu.com>
Date: Tue, 19 Mar 2024 17:23:10 +0800
From: Li Zhijian <lizhijian@...itsu.com>
To: linux-kernel@...r.kernel.org
Cc: Li Zhijian <lizhijian@...itsu.com>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Jessica Zhang <quic_jesszhan@...cinc.com>,
	Sam Ravnborg <sam@...nborg.org>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Daniel Vetter <daniel@...ll.ch>,
	dri-devel@...ts.freedesktop.org
Subject: [PATCH v3] drm/panel: tpo-td043mtea1: Convert sprintf() family to sysfs_emit() family

Per filesystems/sysfs.rst, show() should only use sysfs_emit()
or sysfs_emit_at() when formatting the value to be returned to user space.

coccinelle complains that there are still a couple of functions that use
snprintf(). Convert them to sysfs_emit().

sprintf() and scnprintf() will be converted as well if they have.

Generally, this patch is generated by
make coccicheck M=<path/to/file> MODE=patch \
COCCI=scripts/coccinelle/api/device_attr_show.cocci

No functional change intended

CC: Neil Armstrong <neil.armstrong@...aro.org>
CC: Jessica Zhang <quic_jesszhan@...cinc.com>
CC: Sam Ravnborg <sam@...nborg.org>
CC: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
CC: Maxime Ripard <mripard@...nel.org>
CC: Thomas Zimmermann <tzimmermann@...e.de>
CC: David Airlie <airlied@...il.com>
CC: Daniel Vetter <daniel@...ll.ch>
CC: dri-devel@...ts.freedesktop.org
Signed-off-by: Li Zhijian <lizhijian@...itsu.com>
---
V3:
   split it from a mess of drm,fbdev because they are not the same subsystem.

This is a part of the work "Fix coccicheck device_attr_show warnings"[1]
Split them per subsystem so that the maintainer can review it easily
[1] https://lore.kernel.org/lkml/20240116041129.3937800-1-lizhijian@fujitsu.com/
---
 drivers/gpu/drm/panel/panel-tpo-td043mtea1.c | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/panel/panel-tpo-td043mtea1.c b/drivers/gpu/drm/panel/panel-tpo-td043mtea1.c
index cf4609bb9b1d..0983fe47eb5a 100644
--- a/drivers/gpu/drm/panel/panel-tpo-td043mtea1.c
+++ b/drivers/gpu/drm/panel/panel-tpo-td043mtea1.c
@@ -242,16 +242,11 @@ static ssize_t gamma_show(struct device *dev, struct device_attribute *attr,
 	struct td043mtea1_panel *lcd = dev_get_drvdata(dev);
 	ssize_t len = 0;
 	unsigned int i;
-	int ret;
 
-	for (i = 0; i < ARRAY_SIZE(lcd->gamma); i++) {
-		ret = snprintf(buf + len, PAGE_SIZE - len, "%u ",
-			       lcd->gamma[i]);
-		if (ret < 0)
-			return ret;
-		len += ret;
-	}
-	buf[len - 1] = '\n';
+	for (i = 0; i < ARRAY_SIZE(lcd->gamma); i++)
+		len += sysfs_emit_at(buf, len, "%u ", lcd->gamma[i]);
+	if (len)
+		buf[len - 1] = '\n';
 
 	return len;
 }
-- 
2.29.2