diff options
| author | Michael S. Tsirkin <mst@redhat.com> | 2013-08-04 15:43:40 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-08-04 15:43:40 +0800 |
| commit | 8ff3d73133cb5a8a3514cc184152c553637e74a8 (patch) | |
| tree | 999ec2b6ee2bd5ccf151623b541395a94976b419 /drivers/usb/storage/unusual_devs.h | |
| parent | 0b7b1cfac3b60be07d6b2ae8fe4db495de5883a6 (diff) | |
virtio: support unlocked queue poll
commit cc229884d3f77ec3b1240e467e0236c3e0647c0c upstream.
This adds a way to check ring empty state after enable_cb outside any
locks. Will be used by virtio_net.
Note: there's room for more optimization: caller is likely to have a
memory barrier already, which means we might be able to get rid of a
barrier here. Deferring this optimization until we do some
benchmarking.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
[wg: Backported to 3.2]
Signed-off-by: Wolfram Gloger <wmglo@dent.med.uni-muenchen.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/storage/unusual_devs.h')
0 files changed, 0 insertions, 0 deletions