From 1d309634bcf4e3ce1c2b112bb04fcdec82ac70e1 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Sun, 12 Feb 2017 17:20:00 +0000 Subject: [PATCH] drm/i915: Kill the tasklet then disable Disabling the tasklet leaves it if scheduled on the ready to run list until it is re-enabled. This will leave the ksoftird thread spinning until satisfied. To prevent this situation on starting the GPU reset, we want to kill the tasklet first and then disable. The same problem will arise when a tasklet is scheduled from another device, so a better solution is required for the general case. Reported-by: Tvrtko Ursulin Fixes: 1f7b847d72c3 ("drm/i915: Disable engine->irq_tasklet around resets") Signed-off-by: Chris Wilson Cc: Tvrtko Ursulin Cc: Mika Kuoppala Link: http://patchwork.freedesktop.org/patch/msgid/20170212172002.23072-3-chris@chris-wilson.co.uk Reviewed-by: Mika Kuoppala --- drivers/gpu/drm/i915/i915_gem.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index 48922ff454e6..3c2c2296c1dc 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -2651,8 +2651,8 @@ int i915_gem_reset_prepare(struct drm_i915_private *dev_priv) * Turning off the engine->irq_tasklet until the reset is over * prevents the race. */ - tasklet_disable(&engine->irq_tasklet); tasklet_kill(&engine->irq_tasklet); + tasklet_disable(&engine->irq_tasklet); if (engine->irq_seqno_barrier) engine->irq_seqno_barrier(engine); -- 2.20.1