Re: [PATCH] drm/amd/display: Null check aconnector in event_property_validate

[Liu, Zhan]

[AMD Official Use Only - Internal Distribution Only]

Reviewed-by: Zhan Liu <zhan....@amd.com>

________________________________
From: amd-gfx <amd-gfx-boun...@lists.freedesktop.org> on behalf of Bhawanpreet 
Lakha <bhawanpreet.la...@amd.com>
Sent: Monday, November 25, 2019 10:40:24 AM
To: amd-gfx@lists.freedesktop.org <amd-gfx@lists.freedesktop.org>
Cc: Lakha, Bhawanpreet <bhawanpreet.la...@amd.com>
Subject: [PATCH] drm/amd/display: Null check aconnector in 
event_property_validate

[Why]
previously event_property_validate was only called after we enabled the display.
But after "Refactor HDCP to handle multiple displays per link" this function
can be called at any time. In certain cases we don't have a aconnector

[How]
Null check aconnector and exit early. This is ok because we only need to check 
the
ENABLED->DESIRED transition if a connector exists.

Fixes :cc5dae9f6286 drm/amd/display: Refactor HDCP to handle multiple displays 
per link
Signed-off-by: Bhawanpreet Lakha <bhawanpreet.la...@amd.com>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_hdcp.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_hdcp.c 
b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_hdcp.c
index f6864a51891a..ae329335dfcc 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_hdcp.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_hdcp.c
@@ -225,6 +225,9 @@ static void event_property_validate(struct work_struct 
*work)
         struct mod_hdcp_display_query query;
         struct amdgpu_dm_connector *aconnector = hdcp_work->aconnector;

+       if (!aconnector)
+               return;
+
         mutex_lock(&hdcp_work->mutex);

         query.encryption_status = MOD_HDCP_ENCRYPTION_STATUS_HDCP_OFF;
--
2.17.1

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