5.15-stable review patch. If anyone has any objections, please let me know.
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From: Yao Zi ziyao@disroot.org
[ Upstream commit 5c7bebc1a3f0661db558d60e14dde27fc216d9dc ]
When an error occurs in sysfs show callback, we should return the errno directly instead of formatting it as the result, which produces meaningless output and doesn't inform the userspace of the error.
Fixes: 468f96bfa3a0 ("platform/x86: panasonic-laptop: Add support for battery charging threshold (eco mode)") Fixes: d5a81d8e864b ("platform/x86: panasonic-laptop: Add support for optical driver power in Y and W series") Signed-off-by: Yao Zi ziyao@disroot.org Reviewed-by: Hans de Goede hdegoede@redhat.com Link: https://lore.kernel.org/r/20241118064637.61832-3-ziyao@disroot.org Reviewed-by: Ilpo Järvinen ilpo.jarvinen@linux.intel.com Signed-off-by: Ilpo Järvinen ilpo.jarvinen@linux.intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/platform/x86/panasonic-laptop.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/drivers/platform/x86/panasonic-laptop.c b/drivers/platform/x86/panasonic-laptop.c index 26f4d15c3bf13..e412a550f0983 100644 --- a/drivers/platform/x86/panasonic-laptop.c +++ b/drivers/platform/x86/panasonic-laptop.c @@ -602,8 +602,7 @@ static ssize_t eco_mode_show(struct device *dev, struct device_attribute *attr, result = 1; break; default: - result = -EIO; - break; + return -EIO; } return sysfs_emit(buf, "%u\n", result); } @@ -749,7 +748,12 @@ static ssize_t current_brightness_store(struct device *dev, struct device_attrib static ssize_t cdpower_show(struct device *dev, struct device_attribute *attr, char *buf) { - return sysfs_emit(buf, "%d\n", get_optd_power_state()); + int state = get_optd_power_state(); + + if (state < 0) + return state; + + return sysfs_emit(buf, "%d\n", state); }
static ssize_t cdpower_store(struct device *dev, struct device_attribute *attr,