Re: [V2] drm: msm: adreno: use IS_ERR() instead of null pointer check

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On 07/11/2020 06:19, 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 and IS_ERR_OR_NULL().

Not quite. a6xx_gmu_get_mmio() can return NULL, as it uses ioremap() internally. And ioremap returns NULL in case of error. So the proper check should be IS_ERR_OR_NULL().


Signed-off-by: Wang Qing <wangqing@xxxxxxxx>
---
  drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 6 +++---
  1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
index 491fee4..82420f7
--- 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;
if (adreno_is_a618(adreno_gpu) || adreno_is_a640(adreno_gpu))
@@ -580,9 +580,9 @@ static void a6xx_gmu_rpmh_init(struct a6xx_gmu *gmu)
  	wmb();
err:
-	if (!IS_ERR_OR_NULL(pdcptr))
+	if (!IS_ERR(pdcptr))
  		iounmap(pdcptr);
-	if (!IS_ERR_OR_NULL(seqptr))
+	if (!IS_ERR(seqptr))
  		iounmap(seqptr);
  }


--
With best wishes
Dmitry



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