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
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@ -64,7 +64,13 @@ static irqreturn_t lima_pp_bcast_irq_handler(int irq, void *data)
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struct lima_ip *pp_bcast = data;
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struct lima_device *dev = pp_bcast->dev;
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struct lima_sched_pipe *pipe = dev->pipe + lima_pipe_pp;
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struct drm_lima_m450_pp_frame *frame = pipe->current_task->frame;
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struct drm_lima_m450_pp_frame *frame;
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/* for shared irq case */
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if (!pipe->current_task)
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return IRQ_NONE;
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frame = pipe->current_task->frame;
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for (i = 0; i < frame->num_pp; i++) {
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struct lima_ip *ip = pipe->processor[i];
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