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drm/i915: Avoid null dereference if mst_port is unset. 

I'm not sure if this is really the case and I don't believe
this is the real fix for the bug mentioned here, but since
I don't see a reliable path when mst_port is set and when
mode_valid is requested I believe it is worth to have this
protection here.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=102022
Cc: Elizabeth <elizabethx.de.la.torre.mena@intel.com>
Cc: Stefan Assmann <sassmann@redhat.com>
Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20170810145043.24047-1-rodrigo.vivi@intel.com
hifive-unleashed-5.1
Rodrigo Vivi 2017-08-10 07:50:43 -07:00
parent 28b6cb0820
commit 06bfe5b0d8
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/i915/intel_dp_mst.c
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@ -370,6 +370,9 @@ intel_dp_mst_mode_valid(struct drm_connector *connector,
int bpp = 24; /* MST uses fixed bpp */
int max_rate, mode_rate, max_lanes, max_link_clock;
if (!intel_dp)
return MODE_ERROR;
max_link_clock = intel_dp_max_link_rate(intel_dp);
max_lanes = intel_dp_max_lane_count(intel_dp);