[PATCH] accel/qaic: initialize ret variable to 0
Jeffrey Hugo
quic_jhugo at quicinc.com
Tue Apr 18 20:46:33 UTC 2023
On 4/18/2023 1:20 PM, Tom Rix wrote:
> 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;
> ^~~~~~~~~~
>
> The ret variable is only set some of the time but is always returned.
> So initialize ret to 0.
This does not appear to be entirely accurate to me.
Do you know what analysis Clang is doing? Is it limited to the function
itself?
remap_pfn_range, which initializes ret, will always run at-least once.
Feels more accurate to say that Clang cannot detect that ret will be
initialized, and we want to quiet the warning from the false positive.
> Fixes: ff13be830333 ("accel/qaic: Add datapath")
> Signed-off-by: Tom Rix <trix at redhat.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 c0a574cd1b35..b46a16fb3080 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;
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