[PATCH] drm: Use IS_ERR() instead of null pointer check

[Sam Ravnborg]

Hi Wang.

Thanks for the fix.

On Fri, Nov 06, 2020 at 10:31:19AM +0800, Wang Qing wrote:
> a6xx_gmu_get_mmio() never return null in case of error, but ERR_PTR(),
> so we should use IS_ERR() instead of null pointer check
> 
> Signed-off-by: Wang Qing <wangqing at vivo.com>

In the future please put "drm/<driver-dir>:" in the subject.
See git log . in said directory for normal practice - this let the
readers see this is an msm related patch.



> ---
>  drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> index 491fee4..8c81a89
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> @@ -492,7 +492,7 @@ static void a6xx_gmu_rpmh_init(struct a6xx_gmu *gmu)
>  	void __iomem *seqptr = a6xx_gmu_get_mmio(pdev, "gmu_pdc_seq");
>  	uint32_t pdc_address_offset;
>  
> -	if (!pdcptr || !seqptr)
> +	if (IS_ERR(pdcptr) || IS_ERR(seqptr))
>  		goto err;

When the pointer is checked after the err: label the function
IS_ERR_OR_NULL() is used. Please update both places so they match.

	Sam

>  
>  	if (adreno_is_a618(adreno_gpu) || adreno_is_a640(adreno_gpu))
> -- 
> 2.7.4
> 
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