[PATCH] drm/lima: add timeout to drm scheduler init

[Erico Nunes]

After "5918045c4ed4 drm/scheduler: rework job destruction", lima started
to leak memory due to buffers not being destroyed after job execution in
the drm scheduler.
This started happening because the drm scheduler only destroyed buffers
after cancelling the job timeout handler, and for lima this handler was
never started as lima specified a MAX_SCHEDULE_TIMEOUT timeout.
Lima seems to run well in its current state with a real timeout, so to
make it more aligned with the other drivers from now on, let's use a
real default timeout.
This also fixes the observed memory leaks.
The 500ms value was chosen as it is the current value for all other
embedded gpu drivers using drm sched.

Signed-off-by: Erico Nunes <nunes.erico at gmail.com>
---
 drivers/gpu/drm/lima/lima_drv.c   |  2 +-
 drivers/gpu/drm/lima/lima_sched.c | 11 ++++-------
 2 files changed, 5 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/lima/lima_drv.c b/drivers/gpu/drm/lima/lima_drv.c
index f9a281a62083..b29c26cd13b2 100644
--- a/drivers/gpu/drm/lima/lima_drv.c
+++ b/drivers/gpu/drm/lima/lima_drv.c
@@ -17,7 +17,7 @@
 
 int lima_sched_timeout_ms;
 
-MODULE_PARM_DESC(sched_timeout_ms, "task run timeout in ms (0 = no timeout (default))");
+MODULE_PARM_DESC(sched_timeout_ms, "task run timeout in ms");
 module_param_named(sched_timeout_ms, lima_sched_timeout_ms, int, 0444);
 
 static int lima_ioctl_get_param(struct drm_device *dev, void *data, struct drm_file *file)
diff --git a/drivers/gpu/drm/lima/lima_sched.c b/drivers/gpu/drm/lima/lima_sched.c
index 58a15479d175..4127cacac454 100644
--- a/drivers/gpu/drm/lima/lima_sched.c
+++ b/drivers/gpu/drm/lima/lima_sched.c
@@ -329,19 +329,16 @@ static void lima_sched_error_work(struct work_struct *work)
 
 int lima_sched_pipe_init(struct lima_sched_pipe *pipe, const char *name)
 {
-	long timeout;
-
-	if (lima_sched_timeout_ms <= 0)
-		timeout = MAX_SCHEDULE_TIMEOUT;
-	else
-		timeout = msecs_to_jiffies(lima_sched_timeout_ms);
+	unsigned int timeout = lima_sched_timeout_ms > 0 ?
+			       lima_sched_timeout_ms : 500;
 
 	pipe->fence_context = dma_fence_context_alloc(1);
 	spin_lock_init(&pipe->fence_lock);
 
 	INIT_WORK(&pipe->error_work, lima_sched_error_work);
 
-	return drm_sched_init(&pipe->base, &lima_sched_ops, 1, 0, timeout, name);
+	return drm_sched_init(&pipe->base, &lima_sched_ops, 1, 0,
+			      msecs_to_jiffies(timeout), name);
 }
 
 void lima_sched_pipe_fini(struct lima_sched_pipe *pipe)
-- 
2.20.1