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[v2,6/6] drm/lima: handle shared irq case for lima_pp_bcast_irq_handler

Message ID 1555662781-22570-7-git-send-email-peter.griffin@linaro.org
State Accepted
Commit 409c53f07a81f8db122c461f3255c6f43558c881
Headers show
Series Add HiKey / HI6220 SoC Mali-450 support | expand

Commit Message

Peter Griffin April 19, 2019, 8:33 a.m. UTC 
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>
---
 drivers/gpu/drm/lima/lima_pp.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

-- 
2.7.4
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Patch

diff --git a/drivers/gpu/drm/lima/lima_pp.c b/drivers/gpu/drm/lima/lima_pp.c
index d29721e..8fef224 100644
--- a/drivers/gpu/drm/lima/lima_pp.c
+++ b/drivers/gpu/drm/lima/lima_pp.c
@@ -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];