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From 253696ccd613fbdaa5aba1de44c461a058e0a114 Mon Sep 17 00:00:00 2001
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From: Stefan Schake <stschake@gmail.com>
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Date: Fri, 10 Nov 2017 02:05:06 +0100
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Subject: drm/vc4: Account for interrupts in flight
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Synchronously disable the IRQ to make the following cancel_work_sync
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invocation effective.
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An interrupt in flight could enqueue further overflow mem work. As we
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free the binner BO immediately following vc4_irq_uninstall this caused
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a NULL pointer dereference in the work callback vc4_overflow_mem_work.
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Link: https://github.com/anholt/linux/issues/114
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Signed-off-by: Stefan Schake <stschake@gmail.com>
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Fixes: d5b1a78a772f ("drm/vc4: Add support for drawing 3D frames.")
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Signed-off-by: Eric Anholt <eric@anholt.net>
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Reviewed-by: Eric Anholt <eric@anholt.net>
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Link: https://patchwork.freedesktop.org/patch/msgid/1510275907-993-2-git-send-email-stschake@gmail.com
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diff --git a/drivers/gpu/drm/vc4/vc4_irq.c b/drivers/gpu/drm/vc4/vc4_irq.c
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index 7d7af3a..61b2e53 100644
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--- a/drivers/gpu/drm/vc4/vc4_irq.c
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+++ b/drivers/gpu/drm/vc4/vc4_irq.c
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@@ -208,6 +208,9 @@ vc4_irq_postinstall(struct drm_device *dev)
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{
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struct vc4_dev *vc4 = to_vc4_dev(dev);
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+ /* Undo the effects of a previous vc4_irq_uninstall. */
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+ enable_irq(dev->irq);
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+
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/* Enable both the render done and out of memory interrupts. */
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V3D_WRITE(V3D_INTENA, V3D_DRIVER_IRQS);
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@@ -225,6 +228,9 @@ vc4_irq_uninstall(struct drm_device *dev)
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/* Clear any pending interrupts we might have left. */
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V3D_WRITE(V3D_INTCTL, V3D_DRIVER_IRQS);
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+ /* Finish any interrupt handler still in flight. */
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+ disable_irq(dev->irq);
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+
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cancel_work_sync(&vc4->overflow_mem_work);
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}
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--
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cgit v0.10.2
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