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.
Signed-off-by: Jordan Crouse <jcrouse@xxxxxxxxxxxxxx>
---
drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
index 9e533b86682c..2235ef8129f4 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
@@ -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);
--
2.18.0
