On Thu, Mar 26, 2015 at 12:39:40PM +0000, Tvrtko Ursulin wrote: > From: Tvrtko Ursulin <tvrtko.ursu...@intel.com> > > intel_user_framebuffer_destroy() requires the struct_mutex for its > object bookkeeping, so this means that all calls to > drm_framebuffer_unreference must be held without that lock. > > This is a simplified version of the identically named patch by Chris Wilson. > > References: https://bugs.freedesktop.org/show_bug.cgi?id=89166 > Cc: Chris Wilson <ch...@chris-wilson.co.uk> > Signed-off-by: Tvrtko Ursulin <tvrtko.ursu...@intel.com> > --- > drivers/gpu/drm/i915/intel_display.c | 10 ++++++++++ > 1 file changed, 10 insertions(+) > > diff --git a/drivers/gpu/drm/i915/intel_display.c > b/drivers/gpu/drm/i915/intel_display.c > index cb50854..0788507 100644 > --- a/drivers/gpu/drm/i915/intel_display.c > +++ b/drivers/gpu/drm/i915/intel_display.c > @@ -14020,11 +14020,21 @@ void intel_modeset_gem_init(struct drm_device *dev) > c->primary->fb, > c->primary->state, > NULL)) { > + /* > + * We must drop struct_mutex when calling > + * drm_framebuffer_unreference and it is safe to do so > + * because it is not needed at this point anyway. > + * At this stage the driver is still single-threaded and > + * we are taking it only to silence a warning in > + * intel_pin_and_fence_fb_obj. > + */ > + mutex_unlock(&dev->struct_mutex); > DRM_ERROR("failed to pin boot fb on pipe %d\n", > to_intel_crtc(c)->pipe); > drm_framebuffer_unreference(c->primary->fb); > c->primary->fb = NULL; > update_state_fb(c->primary); > + mutex_lock(&dev->struct_mutex); > } > } > mutex_unlock(&dev->struct_mutex);
Just grab the mutex around the pin_and_fence inside the loop. It doesn't protect anything else. -- Ville Syrjälä Intel OTC _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx
