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ebf51c43ae
Add more checks in nvmap code so as to avoid any possible races. - Update is_nvmap_id_ro and is_nvmap_dmabuf_fd_ro functions so that they return error value during error conditions and also update their callers to handle those error values. - Move all trace statements from end of the function to before handle refcount or dup count is decremented, this make sure we are not dereferencing any freed handle/reference/dambuf. - Increment ref's dup count wherever we feel data race is possible, and decrement it accordingly towards end of function. Bug 4253911 Change-Id: I50fc7cc98ebbf3c50025bc2f9ca32882138fb272 Signed-off-by: Ketan Patil <ketanp@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/2972602 Reviewed-by: Sachin Nikam <snikam@nvidia.com> GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>