]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
vduse: Remove unnecessary spin lock protection
authorXie Yongji <xieyongji@bytedance.com>
Wed, 3 Aug 2022 04:55:19 +0000 (12:55 +0800)
committerMichael S. Tsirkin <mst@redhat.com>
Thu, 11 Aug 2022 08:26:08 +0000 (04:26 -0400)
commitc32ee693125aa19a021dad32abbd49f5c6f70031
tree7395ec514edcbe35088fce60c87ec9f68302740d
parent699b045a8e43bd1063db4795be685bfd659649dc
vduse: Remove unnecessary spin lock protection

Now we use domain->iotlb_lock to protect two different
variables: domain->bounce_maps->bounce_page and
domain->iotlb. But for domain->bounce_maps->bounce_page,
we actually don't need any synchronization between
vduse_domain_get_bounce_page() and vduse_domain_free_bounce_pages()
since vduse_domain_get_bounce_page() will only be called in
page fault handler and vduse_domain_free_bounce_pages() will
be called during file release.

So let's remove the unnecessary spin lock protection in
vduse_domain_get_bounce_page(). Then the usage of
domain->iotlb_lock could be more clear: the lock will be
only used to protect the domain->iotlb.

Signed-off-by: Xie Yongji <xieyongji@bytedance.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20220803045523.23851-2-xieyongji@bytedance.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
drivers/vdpa/vdpa_user/iova_domain.c