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rds: tcp: allow progress of rds_conn_shutdown if the rds_connection is marked ERROR by an intervening FIN 

rds_conn_shutdown() runs in workq context, and marks the rds_connection
as DISCONNECTING before quiescing Tx/Rx paths. However, after all I/O
has quiesced, we may still find the rds_connection state to be
RDS_CONN_ERROR if an intervening FIN was processed in softirq context.

This is not a fatal error: rds_conn_shutdown() should continue the
shutdown, and there is no need to log noisy messages about this event.

Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sowmini Varadhan 2017-03-31 15:56:30 -07:00 committed by David S. Miller
parent d3fbff306c
commit e97656d03c
1 changed files with 9 additions and 1 deletions
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10
net/rds/connection.c
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@ -333,11 +333,19 @@ void rds_conn_shutdown(struct rds_conn_path *cp)
rds_conn_path_reset(cp);
if (!rds_conn_path_transition(cp, RDS_CONN_DISCONNECTING,
RDS_CONN_DOWN) &&
!rds_conn_path_transition(cp, RDS_CONN_ERROR,
RDS_CONN_DOWN)) {
/* This can happen - eg when we're in the middle of tearing
* down the connection, and someone unloads the rds module.
* Quite reproduceable with loopback connections.
* Quite reproducible with loopback connections.
* Mostly harmless.
*
* Note that this also happens with rds-tcp because
* we could have triggered rds_conn_path_drop in irq
* mode from rds_tcp_state change on the receipt of
* a FIN, thus we need to recheck for RDS_CONN_ERROR
* here.
*/
rds_conn_path_error(cp, "%s: failed to transition "
"to state DOWN, current state "