gpu: nvgpu: do not use raw spinlock for ch->timeout.lock

With PREEMPT_RT kernel, regular spinlocks are mapped onto sleeping
spinlocks (rt_mutex locks), and raw spinlocks retain their behaviour.

Schedule while atomic can occur in gk20a_channel_timeout_start,
as it acquires ch->timeout.lock raw spinlock, and then calls
functions that acquire ch->ch_timedout_lock regular spinlock.

Bug 200484795

Change-Id: Iacc63195d8ee6a2d571c998da1b4b5d396f49439
Signed-off-by: Seema Khowala <seemaj@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/2004100
(cherry picked from commit aacc33bb47aa8019c1a20b867d3722c241f7f93a
in dev-kernel)
Reviewed-on: https://git-master.nvidia.com/r/2017923
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Debarshi Dutta <ddutta@nvidia.com>
Tested-by: Debarshi Dutta <ddutta@nvidia.com>
Reviewed-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-by: Bibek Basu <bbasu@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/gpu/nvgpu/include/nvgpu/channel.h b/drivers/gpu/nvgpu/include/nvgpu/channel.h
index 0a956c66..ba3d548e 100644
--- a/drivers/gpu/nvgpu/include/nvgpu/channel.h
+++ b/drivers/gpu/nvgpu/include/nvgpu/channel.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2018-2019, NVIDIA CORPORATION.  All rights reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
@@ -166,7 +166,7 @@ struct channel_gk20a_joblist {
 
 struct channel_gk20a_timeout {
         /* lock protects the running timer state */
-        struct nvgpu_raw_spinlock lock;
+        struct nvgpu_spinlock lock;
         struct nvgpu_timeout timer;
         bool running;
         u32 gp_get;