diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index 50e165b5b60de87d51247b1911addb3e23256eef..e58b741e2ec04e396077adaf51009c41a11e0e9f 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -2948,8 +2948,16 @@ i915_gem_reset_prepare_engine(struct intel_engine_cs *engine) * calling engine->init_hw() and also writing the ELSP. * Turning off the execlists->tasklet until the reset is over * prevents the race. + * + * Note that this needs to be a single atomic operation on the + * tasklet (flush existing tasks, prevent new tasks) to prevent + * a race between reset and set-wedged. It is not, so we do the best + * we can atm and make sure we don't lock the machine up in the more + * common case of recursively being called from set-wedged from inside + * i915_reset. */ - tasklet_kill(&engine->execlists.tasklet); + if (!atomic_read(&engine->execlists.tasklet.count)) + tasklet_kill(&engine->execlists.tasklet); tasklet_disable(&engine->execlists.tasklet); /*