在 2020/11/2 20:09, Thomas Zimmermann 写道:
Hi
Am 02.11.20 um 12:19 schrieb Tian Tao:
Add the detection of false for irq, so that the EINVAL is not
returned when dev->irq_enabled is false.
Signed-off-by: Tian Tao <tiantao6@xxxxxxxxxxxxx>
---
drivers/gpu/drm/drm_irq.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index 09d6e9e..7537a3d 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -172,6 +172,9 @@ int drm_irq_uninstall(struct drm_device *dev)
bool irq_enabled;
int i;
+ if (!dev->irq_enabled || !dev)
+ return 0;
+
Dereferencing a pointer before NULL-checking it, is Yoda programming. :)
I'd just drop the test for !dev and assume that dev is always valid.
I suggest to change the int return value to void and return nothing.
Re-reading the actual implementation of this function, this location
might be too early. Further below there already is a test for
irq_enabled. Put a drm_WARN_ON around it and it should be fine. This way
the vblank handlers will be disabled and erroneous callers will see a
warning in the kernel's log.
thank you，I will send a new patch to fix that.
Best regards
Thomas
irq_enabled = dev->irq_enabled;
dev->irq_enabled = false;
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