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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: anholt/linux#114 Signed-off-by: Stefan Schake <stschake@gmail.com> Fixes: d5b1a78 ("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 (cherry picked from commit 253696ccd613fbdaa5aba1de44c461a058e0a114)
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