Shih-hsin Li 6f9ef25c12 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
(cherry picked from commit af95d14bb0)
Reviewed-on: https://git-master.nvidia.com/r/2116749
Reviewed-by: Alex Waterman <alexw@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Thomas Fleury <tfleury@nvidia.com>
Reviewed-by: Vaibhav Kachore <vkachore@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

2019-05-13 21:56:07 -07:00

34 KiB

Raw Blame History

View Raw