9p/trans_virtio: discard zero-length reply

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commit 26d99834f8 upstream.

When a 9p request is successfully flushed, the server is expected to just
mark it as used without sending a 9p reply (ie, without writing data into
the buffer). In this case, virtqueue_get_buf() will return len == 0 and
we must not report a REQ_STATUS_RCVD status to the client, otherwise the
client will erroneously assume the request has not been flushed.

Signed-off-by: Greg Kurz <groug@kaod.org>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

...

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Greg Kurz 2018-01-22 22:02:05 +01:00 • committed by Ben Hutchings

parent 3f5a898f9e

commit 9a5861a3d5

1 changed files with 2 additions and 1 deletions

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net/9p/trans_virtio.c

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