Re: [PATCH v2 1/1] drm/msm/dpu: Fix error return code in dpu_mdss_init()

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On 10/05/2021 06:16, Zhen Lei wrote:
The error code returned by platform_get_irq() is stored in 'irq', it's
forgotten to be copied to 'ret' before being returned. As a result, the
value 0 of 'ret' is returned incorrectly.

After the above fix is completed, initializing the local variable 'ret'
to 0 is no longer needed, remove it.

In addition, when dpu_mdss_init() is successfully returned, the value of
'ret' is always 0. Therefore, replace "return ret" with "return 0" to make
the code clearer.

Fixes: 070e64dc1bbc ("drm/msm/dpu: Convert to a chained irq chip")
Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Signed-off-by: Zhen Lei <thunder.leizhen@xxxxxxxxxx>

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>

---
  drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c | 8 +++++---
  1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
index 06b56fec04e047a..6b0a7bc87eb75b8 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
@@ -225,7 +225,7 @@ int dpu_mdss_init(struct drm_device *dev)
  	struct msm_drm_private *priv = dev->dev_private;
  	struct dpu_mdss *dpu_mdss;
  	struct dss_module_power *mp;
-	int ret = 0;
+	int ret;
  	int irq;
dpu_mdss = devm_kzalloc(dev->dev, sizeof(*dpu_mdss), GFP_KERNEL);
@@ -253,8 +253,10 @@ int dpu_mdss_init(struct drm_device *dev)
  		goto irq_domain_error;
irq = platform_get_irq(pdev, 0);
-	if (irq < 0)
+	if (irq < 0) {
+		ret = irq;
  		goto irq_error;
+	}
irq_set_chained_handler_and_data(irq, dpu_mdss_irq,
  					 dpu_mdss);
@@ -263,7 +265,7 @@ int dpu_mdss_init(struct drm_device *dev)
pm_runtime_enable(dev->dev); - return ret;
+	return 0;
irq_error:
  	_dpu_mdss_irq_domain_fini(dpu_mdss);



--
With best wishes
Dmitry



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