net/9p: Add waitq to VirtIO transport.

If there is not enough space for the PDU on the VirtIO ring, current
code returns -EIO propagating the error to user.

This patch introduced a wqit_queue on the channel, and lets the process
wait on this queue until VirtIO ring frees up.

Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/net/9p/client.c b/net/9p/client.c
index 2bc99e9031e7..bc7b03537699 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -583,7 +583,8 @@ p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
 
         err = c->trans_mod->request(c, req);
         if (err < 0) {
-                c->status = Disconnected;
+                if (err != -ERESTARTSYS)
+                        c->status = Disconnected;
                 goto reterr;
         }