rds: don't let RDS shutdown a connection while senders are present

This is the first in a long line of patches that tries to fix races
between RDS connection shutdown and RDS traffic.

Here we are maintaining a count of active senders to make sure
the connection doesn't go away while they are using it.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/net/rds/rds.h b/net/rds/rds.h
index 241a0859d16e..4ab3d1aa0237 100644
--- a/net/rds/rds.h
+++ b/net/rds/rds.h
@@ -93,6 +93,7 @@ struct rds_connection {
 
         spinlock_t              c_send_lock;    /* protect send ring */
         atomic_t                c_send_generation;
+        atomic_t                c_senders;
         struct rds_message      *c_xmit_rm;
         unsigned long           c_xmit_sg;
         unsigned int            c_xmit_hdr_off;