Re: [PATCH v2] accel/qaic: initialize ret variable to 0

[Pranjal Ramajor Asha Kanojiya <quic_pkanojiy@quicinc.com>]

On 5/17/2023 10:26 PM, Jeffrey Hugo wrote:
> From: Tom Rix <trix@redhat.com>
> 
> clang static analysis reports
> drivers/accel/qaic/qaic_data.c:610:2: warning: Undefined or garbage
>    value returned to caller [core.uninitialized.UndefReturn]
>          return ret;
>          ^~~~~~~~~~
> 
>  From a code analysis of the function, the ret variable is only set some
> of the time but is always returned.  This suggests ret can return
> uninitialized garbage. However BO allocation will ensure ret is always
> set in reality.
> 
> Initialize ret to 0 to silence the warning.
> 
> Fixes: ff13be830333 ("accel/qaic: Add datapath")
> Signed-off-by: Tom Rix <trix@redhat.com>
> [jhugo: Reword commit text]
> Signed-off-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
> ---
>   drivers/accel/qaic/qaic_data.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/accel/qaic/qaic_data.c b/drivers/accel/qaic/qaic_data.c
> index 8ab26e64b231..e42c1f9ffff8 100644
> --- a/drivers/accel/qaic/qaic_data.c
> +++ b/drivers/accel/qaic/qaic_data.c
> @@ -591,7 +591,7 @@ static int qaic_gem_object_mmap(struct drm_gem_object *obj, struct vm_area_struc
>   	struct qaic_bo *bo = to_qaic_bo(obj);
>   	unsigned long offset = 0;
>   	struct scatterlist *sg;
> -	int ret;
> +	int ret = 0;
>   
>   	if (obj->import_attach)
>   		return -EINVAL;

Reviewed-by: Pranjal Ramajor Asha Kanojiya <quic_pkanojiy@quicinc.com>