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drm/vc4: Account for interrupts in flight 

Synchronously disable the IRQ to make the following cancel_work_sync
invocation effective.

An interrupt in flight could enqueue further overflow mem work. As we
free the binner BO immediately following vc4_irq_uninstall this caused
a NULL pointer dereference in the work callback vc4_overflow_mem_work.

Link: https://github.com/anholt/linux/issues/114
Signed-off-by: Stefan Schake <stschake@gmail.com>
Fixes: d5b1a78a77 ("drm/vc4: Add support for drawing 3D frames.")
Signed-off-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Eric Anholt <eric@anholt.net>
Link: https://patchwork.freedesktop.org/patch/msgid/1510275907-993-2-git-send-email-stschake@gmail.com
This commit is contained in:
Stefan Schake 2017-11-10 02:05:06 +01:00 committed by Eric Anholt
parent 44419ce7d7
commit 253696ccd6
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/vc4/vc4_irq.c
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@ -208,6 +208,9 @@ vc4_irq_postinstall(struct drm_device *dev)
{
struct vc4_dev *vc4 = to_vc4_dev(dev);
/* Undo the effects of a previous vc4_irq_uninstall. */
enable_irq(dev->irq);
/* Enable both the render done and out of memory interrupts. */
V3D_WRITE(V3D_INTENA, V3D_DRIVER_IRQS);
@ -225,6 +228,9 @@ vc4_irq_uninstall(struct drm_device *dev)
/* Clear any pending interrupts we might have left. */
V3D_WRITE(V3D_INTCTL, V3D_DRIVER_IRQS);
/* Finish any interrupt handler still in flight. */
disable_irq(dev->irq);
cancel_work_sync(&vc4->overflow_mem_work);
}