[PATCH v4 4/5] drm/i915: Create the locked version of the request add

[Andi Shyti <andi.shyti@xxxxxxxxxxxxxxx>]

i915_request_add() assumes that the timeline is locked whtn the
function is called. Before exiting it releases the lock. But in
the next commit we have one case where releasing the timeline
mutex is not necessary and we don't want that.

Make a new i915_request_add_locked() version of the function
where the lock is not released.

Signed-off-by: Andi Shyti <andi.shyti@xxxxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
---
 drivers/gpu/drm/i915/i915_request.c | 14 +++++++++++---
 drivers/gpu/drm/i915/i915_request.h |  1 +
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c
index 5ddb0e02b06b7..a4af16e25d966 100644
--- a/drivers/gpu/drm/i915/i915_request.c
+++ b/drivers/gpu/drm/i915/i915_request.c
@@ -1852,13 +1852,13 @@ void __i915_request_queue(struct i915_request *rq,
 	local_bh_enable(); /* kick tasklets */
 }
 
-void i915_request_add(struct i915_request *rq)
+void i915_request_add_locked(struct i915_request *rq)
 {
 	struct intel_timeline * const tl = i915_request_timeline(rq);
 	struct i915_sched_attr attr = {};
 	struct i915_gem_context *ctx;
 
-	lockdep_assert_held(&tl->mutex);
+	intel_context_assert_timeline_is_locked(tl);
 	lockdep_unpin_lock(&tl->mutex, rq->cookie);
 
 	trace_i915_request_add(rq);
@@ -1873,7 +1873,15 @@ void i915_request_add(struct i915_request *rq)
 
 	__i915_request_queue(rq, &attr);
 
-	mutex_unlock(&tl->mutex);
+}
+
+void i915_request_add(struct i915_request *rq)
+{
+	struct intel_timeline * const tl = i915_request_timeline(rq);
+
+	i915_request_add_locked(rq);
+
+	intel_context_timeline_unlock(tl);
 }
 
 static unsigned long local_clock_ns(unsigned int *cpu)
diff --git a/drivers/gpu/drm/i915/i915_request.h b/drivers/gpu/drm/i915/i915_request.h
index bb48bd4605c03..29e3a37c300a7 100644
--- a/drivers/gpu/drm/i915/i915_request.h
+++ b/drivers/gpu/drm/i915/i915_request.h
@@ -425,6 +425,7 @@ int i915_request_await_deps(struct i915_request *rq, const struct i915_deps *dep
 int i915_request_await_execution(struct i915_request *rq,
 				 struct dma_fence *fence);
 
+void i915_request_add_locked(struct i915_request *rq);
 void i915_request_add(struct i915_request *rq);
 
 bool __i915_request_submit(struct i915_request *request);
-- 
2.39.2