gpu: nvgpu: decrease refcount when sync-unmap fails

When nvgpu_vm_unmap_sync fails, nvgpu_unmap_sync currently bails
out without decreasing the buffer refcount. This prevents from
releasing the buffer, in case a deferred job completes after the
timeout (which was observed 2 times during overnight
stress tests). This also means that the fixed address is not
re-useable.

Throw out a warning when nvgpu_vm_unmap_sync fails, but proceed
with decreasing refcount.

Bug 200578193

Change-Id: Ie0cc7caa7d12ca0a3b42123a5f7a28bda72dabbc
Signed-off-by: ddutta <ddutta@nvidia.com>
(cherry picked from commit a433f26d5bb1ec3253fc2655998b1ef7fb2847cb
in dev-main)
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2291352
Tested-by: Naveen Kumar S <nkumars@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
Reviewed-by: automaticguardword <automaticguardword@nvidia.com>
Reviewed-by: Bibek Basu <bbasu@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>

0 files changed, 0 insertions, 0 deletions