drm/i915/psr: Get pipe id following atomic guidelines

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As stated in struct drm_encoder, crtc field should only be used
by non-atomic drivers.

So here caching the pipe id in intel_psr_enable() what is way more
simple and efficient than at every call to
intel_psr_flush()/invalidate() get the
drm.mode_config.connection_mutex lock to safely be able to get the
pipe id by reading drm_connector_state.crtc.

This should fix the null pointer dereference crash below as the
previous way to get the pipe id was prone to race conditions.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=105959
Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181128072838.22773-1-jose.souza@intel.com

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This commit is contained in:

José Roberto de Souza 2018-11-27 23:28:38 -08:00

parent b9f78d6752

commit f0ad62a631

2 changed files with 5 additions and 15 deletions

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1

drivers/gpu/drm/i915/i915_drv.h

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19

drivers/gpu/drm/i915/intel_psr.c

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