| Message ID | 20240319035555.1577734-1-lizhijian@fujitsu.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | [v2] drm,fbdev: td043mtea1: Convert sprintf() family to sysfs_emit() family | expand |
On 19/03/2024 16:07, Neil Armstrong wrote: > Hi, > > On 19/03/2024 04:55, Li Zhijian wrote: >> 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 > > Please split patches in 2, while the driver targets the same hw, they > are not under the same subsystems. Got it, i will do that soon. Thanks Zhijian > > Neil > >> >> 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; >> } >
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; }
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(-)