Sagar Kamble c1a9281720 gpu: nvgpu: ensure the buffer is RW when doing vmap ...

RO buffers should not be accessed via any paths in userspace/kernel.
vmap is one such path. nvmap now returns error if vmap is attempted
on RO buffer. However that leads to kernel warning. nvgpu should
ensure that buffer is RW before performing vmap on the buffer.

With this check, dma_buf_vmap will not be called for RO buffers.

Bug 3562426

Change-Id: I4782d2ae6b17243fdb3d0fc5d5d732a17f694a7c
Signed-off-by: Sagar Kamble <skamble@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2693976
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: svc-mobile-cert <svc-mobile-cert@nvidia.com>
Reviewed-by: Puneet Saxena <puneets@nvidia.com>
Reviewed-by: Martin Radev <mradev@nvidia.com>
Reviewed-by: Alex Waterman <alexw@nvidia.com>
GVS: Gerrit_Virtual_Submit

2022-04-14 17:03:14 -07:00

..

gpu

gpu: nvgpu: ensure the buffer is RW when doing vmap

2022-04-14 17:03:14 -07:00