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...ast patch series. This patch is only needed for drivers that use console_lock (for drm_fb_helper_set_suspend) in their runtime resume functions. Lukas posted fixes for runtime PM reference leaks, those are different from this deadlock (see https://lists.freedesktop.org/archives/dri-devel/2016-July/113005.html for a backtrace for this issue). The deadlock could also be avoided if the device backing the fbcon is somehow runtime-resumed outside the lock, but that feels like a larger hack that does not seem easy. The i915 patch was done to reduce resume time (due to console_lock contention), that fea...

...eded for drivers that use console_lock (for > > drm_fb_helper_set_suspend) in their runtime resume functions. > > Lukas posted fixes for runtime PM reference leaks, those are different > > from this deadlock (see > > https://lists.freedesktop.org/archives/dri-devel/2016-July/113005.html > > for a backtrace for this issue). > > > > The deadlock could also be avoided if the device backing the fbcon is > > somehow runtime-resumed outside the lock, but that feels like a larger > > hack that does not seem easy. > > > > The i915 patch was...

...his patch is only needed for drivers that use console_lock (for > drm_fb_helper_set_suspend) in their runtime resume functions. > Lukas posted fixes for runtime PM reference leaks, those are different > from this deadlock (see > https://lists.freedesktop.org/archives/dri-devel/2016-July/113005.html > for a backtrace for this issue). > > The deadlock could also be avoided if the device backing the fbcon is > somehow runtime-resumed outside the lock, but that feels like a larger > hack that does not seem easy. > > The i915 patch was done to reduce resume time (due to...

The FBIOPUT_CON2FBMAP ioctl takes a console_lock(). When this is called while nouveau was runtime suspended, a deadlock would occur due to nouveau_fbcon_set_suspend also trying to obtain console_lock(). Fix this by delaying the drm_fb_helper_set_suspend call. Based on the i915 code (which was done for performance reasons though). Cc: Chris Wilson <chris at chris-wilson.co.uk> Cc: Daniel