gpu: nvgpu: rename has_timedout and make it thread safe

Currently has_timedout variable is protected by wmb at places
where it is being set and there is no correspoding rmb whenever
has_timedout variable is read. This is prone to errors for
concurrent execution. This change is supposed to fix this issue.
Rename has_timedout variable of channel struct to ch_timedout.
Also to avoid rmb every time ch_timedout is read,
ch_timedout_spinlock is added to protect ch_timedout
variable for taking care of concurrent execution.

Bug 2404865
Bug 2092051

Change-Id: I0bee9f50af0a48720aa8b54cbc3af97ef9f6df00
Signed-off-by: Seema Khowala <seemaj@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1930935
Signed-off-by: Debarshi Dutta <ddutta@nvidia.com>
(cherry picked from commit 1f54ea09e3445d9ca3cf7a69b4967849cc9defc8
in dev-kernel)
Reviewed-on: https://git-master.nvidia.com/r/2016975
GVS: Gerrit_Virtual_Submit
Reviewed-by: Alex Waterman <alexw@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, 1 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/os/linux/ioctl_tsg.c b/drivers/gpu/nvgpu/os/linux/ioctl_tsg.c
index b0cdf5e5..c5079bd6 100644
--- a/drivers/gpu/nvgpu/os/linux/ioctl_tsg.c
+++ b/drivers/gpu/nvgpu/os/linux/ioctl_tsg.c
@@ -141,7 +141,7 @@ static int gk20a_tsg_unbind_channel_fd(struct tsg_gk20a *tsg, int ch_fd)
          * Mark the channel timedout since channel unbound from TSG
          * has no context of its own so it can't serve any job
          */
-        ch->has_timedout = true;
+        gk20a_channel_set_timedout(ch);
 
 out:
         gk20a_channel_put(ch);