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authorJulian Wiedmann <jwi@linux.vnet.ibm.com>2018-03-20 07:59:15 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-03-31 18:10:43 +0200
commitbba757a2c128ff890025acd1122e844faeb809ec (patch)
treeb2561ee00727aace9a0d0e5a7993044edb72b7ff
parente5245642201733746170c0f8abc6b7cfaac7e531 (diff)
s390/qeth: on channel error, reject further cmd requests
[ Upstream commit a6c3d93963e4b333c764fde69802c3ea9eaa9d5c ] When the IRQ handler determines that one of the cmd IO channels has failed and schedules recovery, block any further cmd requests from being submitted. The request would inevitably stall, and prevent the recovery from making progress until the request times out. This sort of error was observed after Live Guest Relocation, where the pending IO on the READ channel intentionally gets terminated to kick-start recovery. Simultaneously the guest executed SIOCETHTOOL, triggering qeth to issue a QUERY CARD INFO command. The command then stalled in the inoperabel WRITE channel. Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/s390/net/qeth_core_main.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index cb69f2d674ae..939b5b5e97ef 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -1175,6 +1175,7 @@ static void qeth_irq(struct ccw_device *cdev, unsigned long intparm,
}
rc = qeth_get_problem(cdev, irb);
if (rc) {
+ card->read_or_write_problem = 1;
qeth_clear_ipacmd_list(card);
qeth_schedule_recovery(card);
goto out;