[Intel-gfx] [PATCH 12/17] drm/i915: Allow init_breadcrumbs to be used from irq context

[Chris Wilson]

In order to support engine reset from irq (timer) context, we need to be
able to re-initialise the breadcrumbs. So we need to promote the plain
spin_lock_irq to a safe spin_lock_irqsave.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/intel_breadcrumbs.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_breadcrumbs.c b/drivers/gpu/drm/i915/intel_breadcrumbs.c
index 0a2128c6b418..ca0b04d9747c 100644
--- a/drivers/gpu/drm/i915/intel_breadcrumbs.c
+++ b/drivers/gpu/drm/i915/intel_breadcrumbs.c
@@ -846,8 +846,9 @@ static void cancel_fake_irq(struct intel_engine_cs *engine)
 void intel_engine_reset_breadcrumbs(struct intel_engine_cs *engine)
 {
 	struct intel_breadcrumbs *b = &engine->breadcrumbs;
+	unsigned long flags;
 
-	spin_lock_irq(&b->irq_lock);
+	spin_lock_irqsave(&b->irq_lock, flags);
 
 	/*
 	 * Leave the fake_irq timer enabled (if it is running), but clear the
@@ -871,7 +872,7 @@ void intel_engine_reset_breadcrumbs(struct intel_engine_cs *engine)
 	 */
 	clear_bit(ENGINE_IRQ_BREADCRUMB, &engine->irq_posted);
 
-	spin_unlock_irq(&b->irq_lock);
+	spin_unlock_irqrestore(&b->irq_lock, flags);
 }
 
 void intel_engine_fini_breadcrumbs(struct intel_engine_cs *engine)
-- 
2.16.3