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drm/msm/dpu: Remove dpu_mdss_isr when dpu_mdss_destroy is called 

The MDSS device is created before the MSM driver attempts to bind the
sub components. If any of the components return -EPROBE_DEFER the MDSS
device is destroyed and tried again later.

If this happens the dpu_mdss_isr interrupt created from the DPU MDSS
is not freed when the MDSS device is destroyed and has a risk of
triggering later and hitting a fault by accessing a mmio region that
no longer exists. Even if the interrupt isn't triggered by
accident when the device attempts to reprobe it would error out
when it tries to re-register the interrupt so unconditionally removing
it in the destroy is the right move.

Switch the device managed dpu_mdss_isr to be unmanaged and add a
free_irq() in the mdss destroy function.

Reviewed-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>

Signed-off-by: Rob Clark <robdclark@gmail.com>
This commit is contained in:
Jordan Crouse 2018-08-28 15:23:04 -06:00 committed by Rob Clark
parent 96fc56a775
commit d270bdf41e
1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
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@ -158,6 +158,8 @@ static void dpu_mdss_destroy(struct drm_device *dev)
_dpu_mdss_irq_domain_fini(dpu_mdss);
free_irq(platform_get_irq(pdev, 0), dpu_mdss);
msm_dss_put_clk(mp->clk_config, mp->num_clk);
devm_kfree(&pdev->dev, mp->clk_config);
@ -215,7 +217,7 @@ int dpu_mdss_init(struct drm_device *dev)
if (ret)
goto irq_domain_error;
ret = devm_request_irq(dev->dev, platform_get_irq(pdev, 0),
ret = request_irq(platform_get_irq(pdev, 0),
dpu_mdss_irq, 0, "dpu_mdss_isr", dpu_mdss);
if (ret) {
DPU_ERROR("failed to init irq: %d\n", ret);