Shih-hsin Li af95d14bb0 gpu: nvgpu: fix synchronization in nvgpu_vm_map ...

The mapping early returned from nvgpu_vm_map might already
be unmapped during channel clean up. Increase refcount of
an already mapped buffer inside the scope of update_gmmu_lock
mutex to avoid this race.

Bug 200494150

Change-Id: I66d9272e42c40cd3aae7ba3bb8106ec37691bf8e
Signed-off-by: Shih-hsin Li <seasonl@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/2114163
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-by: Alex Waterman <alexw@nvidia.com>
Reviewed-by: Vinayak Pane <vpane@nvidia.com>
Reviewed-by: Daniel Fu <danifu@nvidia.com>
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

2019-05-09 20:43:17 -07:00

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