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drm/i915: Avoid drm_atomic_state_put(NULL) in intel_display_resume 

intel_display_resume() may be called without an atomic state to restore,
i.e. dev_priv->modeset_reset_restore state is NULL. One such case is
following a lid open/close event and the forced modeset in
intel_lid_notify().

Reported-by: Stefan Seyfried <stefan.seyfried@googlemail.com>
Tested-by: Stefan Seyfried <stefan.seyfried@googlemail.com>
Fixes: 0853695c3b ("drm: Add reference counting to drm_atomic_state")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: <drm-intel-fixes@lists.freedesktop.org> # v4.10-rc1+
Link: http://patchwork.freedesktop.org/patch/msgid/20170115125825.18597-1-chris@chris-wilson.co.uk
Reviewed-by: Ander Conselvan de Oliveira <conselvan2@gmail.com>
This commit is contained in:
Chris Wilson 2017-01-15 12:58:25 +00:00
parent 71895a0858
commit 3c5e37f169
1 changed files with 2 additions and 1 deletions
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1
drivers/gpu/drm/i915/intel_display.c
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@ -17221,6 +17221,7 @@ void intel_display_resume(struct drm_device *dev)
if (ret) if (ret)
DRM_ERROR("Restoring old state failed with %i\n", ret); DRM_ERROR("Restoring old state failed with %i\n", ret);
if (state)
drm_atomic_state_put(state); drm_atomic_state_put(state);
} }