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drm/lima: handle shared irq case for lima_pp_bcast_irq_handler 

On Hikey board all lima ip blocks are shared with one irq.
This patch avoids a NULL ptr deref crash on this platform
on startup. Tested with Weston and kmscube.

Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
Cc: Rob Herring <robh@kernel.org>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Qiang Yu <yuq825@gmail.com>
Signed-off-by: Qiang Yu <yuq825@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1555662781-22570-7-git-send-email-peter.griffin@linaro.org
This commit is contained in:
Peter Griffin 2019-04-19 09:33:01 +01:00 committed by Qiang Yu
parent 96354b5ca4
commit 409c53f07a
1 changed files with 7 additions and 1 deletions
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8
drivers/gpu/drm/lima/lima_pp.c
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@ -64,7 +64,13 @@ static irqreturn_t lima_pp_bcast_irq_handler(int irq, void *data)
struct lima_ip *pp_bcast = data;
struct lima_device *dev = pp_bcast->dev;
struct lima_sched_pipe *pipe = dev->pipe + lima_pipe_pp;
struct drm_lima_m450_pp_frame *frame = pipe->current_task->frame;
struct drm_lima_m450_pp_frame *frame;
/* for shared irq case */
if (!pipe->current_task)
return IRQ_NONE;
frame = pipe->current_task->frame;
for (i = 0; i < frame->num_pp; i++) {
struct lima_ip *ip = pipe->processor[i];