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| author | Arnd Bergmann <arnd@arndb.de> | 2018-11-02 16:14:32 +0100 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2018-11-06 13:57:42 +0100 |
| commit | 3fc202e81db70bf60beb9296eefd4e48d6304607 (patch) | |
| tree | 3900c89db4a74de4d662970f72b7fe7bab52f974 /drivers/hid/hid-asus.c | |
| parent | 0c7244209588630a9b45e52490ef1390e04499a6 (diff) | |
| download | lwn-3fc202e81db70bf60beb9296eefd4e48d6304607.tar.gz lwn-3fc202e81db70bf60beb9296eefd4e48d6304607.zip | |
HID: asus: fix build warning wiht CONFIG_ASUS_WMI disabled
asus_wmi_evaluate_method() is an empty dummy function when CONFIG_ASUS_WMI
is disabled, or not reachable from a built-in device driver. This leads to
a theoretical evaluation of an uninitialized variable that the compiler
complains about, failing to check that the hardcoded return value makes
this an unreachable code path:
In file included from include/linux/printk.h:336,
from include/linux/kernel.h:14,
from include/linux/list.h:9,
from include/linux/dmi.h:5,
from drivers/hid/hid-asus.c:29:
drivers/hid/hid-asus.c: In function 'asus_input_configured':
include/linux/dynamic_debug.h:135:3: error: 'value' may be used uninitialized in this function [-Werror=maybe-uninitialized]
__dynamic_dev_dbg(&descriptor, dev, fmt, \
^~~~~~~~~~~~~~~~~
drivers/hid/hid-asus.c:359:6: note: 'value' was declared here
u32 value;
^~~~~
With an extra IS_ENABLED() check, the warning goes away.
Fixes: 3b692c55e58d ("HID: asus: only support backlight when it's not driven by WMI")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid/hid-asus.c')
| -rw-r--r-- | drivers/hid/hid-asus.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/hid/hid-asus.c b/drivers/hid/hid-asus.c index dc6d6477e961..a1fa2fc8c9b5 100644 --- a/drivers/hid/hid-asus.c +++ b/drivers/hid/hid-asus.c @@ -359,6 +359,9 @@ static bool asus_kbd_wmi_led_control_present(struct hid_device *hdev) u32 value; int ret; + if (!IS_ENABLED(CONFIG_ASUS_WMI)) + return false; + ret = asus_wmi_evaluate_method(ASUS_WMI_METHODID_DSTS2, ASUS_WMI_DEVID_KBD_BACKLIGHT, 0, &value); hid_dbg(hdev, "WMI backlight check: rc %d value %x", ret, value); |