[PATCH] drm/msm/dsi: add protection against NULL dsi device

[Abhinav Kumar]

When panel probe happens after DSI probe, the DSI probe
is deferred as per current design. In the probe defer path
dsi device is destroyed. This NULL dsi device could be
deferenced by the panel probe in the mipi_dsi_attach path.

Check for NULL dsi device before accessing it.

Reported-by: Jeffrey Hugo <jhugo at codeaurora.org>
Tested-by: Jeffrey Hugo <jhugo at codeaurora.org>
Signed-off-by: Abhinav Kumar <abhinavk at codeaurora.org>
---
 drivers/gpu/drm/msm/dsi/dsi_manager.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/dsi/dsi_manager.c b/drivers/gpu/drm/msm/dsi/dsi_manager.c
index 80aa634..cc2569d 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_manager.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_manager.c
@@ -769,7 +769,7 @@ bool msm_dsi_manager_cmd_xfer_trigger(int id, u32 dma_base, u32 len)
 void msm_dsi_manager_attach_dsi_device(int id, u32 device_flags)
 {
 	struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
-	struct drm_device *dev = msm_dsi->dev;
+	struct drm_device *dev = msm_dsi ? msm_dsi->dev : NULL;
 	struct msm_drm_private *priv;
 	struct msm_kms *kms;
 	struct drm_encoder *encoder;
-- 
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