From: Daniel Vetter Date: Thu, 8 Sep 2011 12:00:22 +0000 (+0200) Subject: drm/i915: properly cancel rps_work on module unload v2 X-Git-Tag: MMI-PSA29.97-13-9~18200^2~2^2~37 X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=6fdd4d98e56e0919bb324c2ab1ff66395cf3b385;p=GitHub%2FMotorolaMobilityLLC%2Fkernel-slsi.git drm/i915: properly cancel rps_work on module unload v2 The rps disabling code wasn't properly cancelling outstanding work items. Also add a comment that explains why we're not racing with the work item that could unmask interrupts - that piece of code confused me quite a bit. v2: Ben Widawsky pointed out that the first patch would deadlock (and a few lesser problems). All corrected. Signed-off-by: Daniel Vetter Reviewed-by: Ben Widawsky Reviewed-by: Chris Wilson Signed-off-by: Keith Packard --- diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 7c8dfcc9be43..186cde29994d 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -7658,6 +7658,10 @@ void gen6_disable_rps(struct drm_device *dev) I915_WRITE(GEN6_RPNSWREQ, 1 << 31); I915_WRITE(GEN6_PMINTRMSK, 0xffffffff); I915_WRITE(GEN6_PMIER, 0); + /* Complete PM interrupt masking here doesn't race with the rps work + * item again unmasking PM interrupts because that is using a different + * register (PMIMR) to mask PM interrupts. The only risk is in leaving + * stale bits in PMIIR and PMIMR which gen6_enable_rps will clean up. */ spin_lock_irq(&dev_priv->rps_lock); dev_priv->pm_iir = 0; @@ -8655,6 +8659,7 @@ void intel_modeset_cleanup(struct drm_device *dev) * enqueue unpin/hotplug work. */ drm_irq_uninstall(dev); cancel_work_sync(&dev_priv->hotplug_work); + cancel_work_sync(&dev_priv->rps_work); /* flush any delayed tasks or pending work */ flush_scheduled_work();