diff options
| author | Jason Wang <[email protected]> | 2018-05-22 14:21:04 +0800 |
|---|---|---|
| committer | David S. Miller <[email protected]> | 2018-05-23 14:32:12 -0400 |
| commit | 2f3ab6221e4c87960347d65c7cab9bd917d1f637 (patch) | |
| tree | 5a4050742518ae4b6df94df2ee624e54636770cf /tools/perf/scripts/python | |
| parent | a43ad59a908055d288e524e559494805a6c7299e (diff) | |
tuntap: correctly set SOCKWQ_ASYNC_NOSPACE
When link is down, writes to the device might fail with
-EIO. Userspace needs an indication when the status is resolved. As a
fix, tun_net_open() attempts to wake up writers - but that is only
effective if SOCKWQ_ASYNC_NOSPACE has been set in the past. This is
not the case of vhost_net which only poll for EPOLLOUT after it meets
errors during sendmsg().
This patch fixes this by making sure SOCKWQ_ASYNC_NOSPACE is set when
socket is not writable or device is down to guarantee EPOLLOUT will be
raised in either tun_chr_poll() or tun_sock_write_space() after device
is up.
Cc: Hannes Frederic Sowa <[email protected]>
Cc: Eric Dumazet <[email protected]>
Fixes: 1bd4978a88ac2 ("tun: honor IFF_UP in tun_get_user()")
Signed-off-by: Jason Wang <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python')
0 files changed, 0 insertions, 0 deletions