Re: [PATCH] gpio: cdev: avoid uninitialized variable dereference

["Arnd Bergmann" <arnd@xxxxxxxx>]

On Fri, Feb 16, 2024, at 14:19, Bartosz Golaszewski wrote:
> On Fri, Feb 16, 2024 at 2:00 PM Arnd Bergmann <arnd@xxxxxxxxxx> wrote:
>>
>> From: Arnd Bergmann <arnd@xxxxxxxx>
>>
>> The 'gc' variable is never set before it gets printed:
>>
>> drivers/gpio/gpiolib-cdev.c:2802:11: error: variable 'gc' is uninitialized when used here [-Werror,-Wuninitialized]
>>  2802 |         chip_dbg(gc, "added GPIO chardev (%d:%d)\n", MAJOR(devt), gdev->id);
>>       |                  ^~
>> drivers/gpio/gpiolib.h:277:11: note: expanded from macro 'chip_dbg'
>>   277 |         dev_dbg(&gc->gpiodev->dev, "(%s): " fmt, gc->label, ##__VA_ARGS__)
>>       |                  ^~
>>
>> Use dev_dbg() directly.
>>
>> Fixes: 8574b5b47610 ("gpio: cdev: use correct pointer accessors with SRCU")
>> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
>> ---
>
> I seem to have beat you to it[1] and my patch doesn't change the log
> message so I'll apply it instead of this one.

Ok, thanks. I thought about doing this, but could not
figure out which of the RCU primitives to use.

     Arnd