From: Li Zhijian <lizhijian@fujitsu.com>
To: linux-kernel@vger.kernel.org
Cc: Li Zhijian <lizhijian@fujitsu.com>,
Neil Armstrong <neil.armstrong@linaro.org>,
Jessica Zhang <quic_jesszhan@quicinc.com>,
Sam Ravnborg <sam@ravnborg.org>,
Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
Maxime Ripard <mripard@kernel.org>,
Thomas Zimmermann <tzimmermann@suse.de>,
David Airlie <airlied@gmail.com>, Daniel Vetter <daniel@ffwll.ch>,
Helge Deller <deller@gmx.de>,
linux-omap@vger.kernel.org, linux-fbdev@vger.kernel.org,
dri-devel@lists.freedesktop.org
Subject: [PATCH v2] drm,fbdev: td043mtea1: Convert sprintf() family to sysfs_emit() family
Date: Tue, 19 Mar 2024 11:55:55 +0800 [thread overview]
Message-ID: <20240319035555.1577734-1-lizhijian@fujitsu.com> (raw)
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@linaro.org>
CC: Jessica Zhang <quic_jesszhan@quicinc.com>
CC: Sam Ravnborg <sam@ravnborg.org>
CC: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
CC: Maxime Ripard <mripard@kernel.org>
CC: Thomas Zimmermann <tzimmermann@suse.de>
CC: David Airlie <airlied@gmail.com>
CC: Daniel Vetter <daniel@ffwll.ch>
CC: Helge Deller <deller@gmx.de>
CC: linux-omap@vger.kernel.org
CC: linux-fbdev@vger.kernel.org
CC: dri-devel@lists.freedesktop.org
Signed-off-by: Li Zhijian <lizhijian@fujitsu.com>
---
V2:
Fix missing '+' before '=' in drivers/video/fbdev/omap2/omapfb/displays/panel-tpo-td043mtea1.c
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 ++++---------
.../omap2/omapfb/displays/panel-tpo-td043mtea1.c | 12 ++++--------
2 files changed, 8 insertions(+), 17 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;
}
diff --git a/drivers/video/fbdev/omap2/omapfb/displays/panel-tpo-td043mtea1.c b/drivers/video/fbdev/omap2/omapfb/displays/panel-tpo-td043mtea1.c
index 477789cff8e0..3624452e1dd0 100644
--- a/drivers/video/fbdev/omap2/omapfb/displays/panel-tpo-td043mtea1.c
+++ b/drivers/video/fbdev/omap2/omapfb/displays/panel-tpo-td043mtea1.c
@@ -228,14 +228,10 @@ static ssize_t tpo_td043_gamma_show(struct device *dev,
int ret;
int i;
- for (i = 0; i < ARRAY_SIZE(ddata->gamma); i++) {
- ret = snprintf(buf + len, PAGE_SIZE - len, "%u ",
- ddata->gamma[i]);
- if (ret < 0)
- return ret;
- len += ret;
- }
- buf[len - 1] = '\n';
+ for (i = 0; i < ARRAY_SIZE(ddata->gamma); i++)
+ len += sysfs_emit_at(buf, len, "%u ", ddata->gamma[i]);
+ if (len)
+ buf[len - 1] = '\n';
return len;
}
--
2.29.2
next reply other threads:[~2024-03-19 3:56 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-19 3:55 Li Zhijian [this message]
2024-03-19 8:07 ` [PATCH v2] drm,fbdev: td043mtea1: Convert sprintf() family to sysfs_emit() family Neil Armstrong
2024-03-19 9:05 ` Zhijian Li (Fujitsu)
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