From: Chris Wilson Date: Fri, 29 Nov 2019 17:25:42 +0000 (+0000) Subject: drm/i915/execlists: Ensure the tasklet is decoupled upon shutdown X-Git-Tag: v5.6-rc1~114^2~17^2~253 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=97c16353970aa28418a49ef6980b6e4f36e35feb;p=thirdparty%2Fkernel%2Flinux.git drm/i915/execlists: Ensure the tasklet is decoupled upon shutdown As we only cancel the timers asynchronously, they may still be running on another CPU as we shutdown, raising one last softirq. So be safe and make sure the tasklet is flushed before destroying the engine's memory. Signed-off-by: Chris Wilson Acked-by: Mika Kuoppala Link: https://patchwork.freedesktop.org/patch/msgid/20191129172542.1222810-1-chris@chris-wilson.co.uk --- diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c index 4cd0d46b5da65..fef4b7e823f5e 100644 --- a/drivers/gpu/drm/i915/gt/intel_lrc.c +++ b/drivers/gpu/drm/i915/gt/intel_lrc.c @@ -3777,8 +3777,18 @@ void intel_execlists_set_default_submission(struct intel_engine_cs *engine) engine->flags |= I915_ENGINE_HAS_RELATIVE_MMIO; } +static void execlists_shutdown(struct intel_engine_cs *engine) +{ + /* Synchronise with residual timers and any softirq they raise */ + del_timer_sync(&engine->execlists.timer); + del_timer_sync(&engine->execlists.preempt); + tasklet_kill(&engine->execlists.tasklet); +} + static void execlists_destroy(struct intel_engine_cs *engine) { + execlists_shutdown(engine); + intel_engine_cleanup_common(engine); lrc_destroy_wa_ctx(engine); kfree(engine);