commit de1b04388f63cbddf91d9f6c50c29be7232881ca
author Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Mon Dec 07 12:51:40 2009 +0100
committer Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> Mon Dec 07 12:51:33 2009 +0100
tree 2a2500ab1093bb77b81e84ae56ab3aae1501c52a
parent 7a8ad1001c51bba0507ee08cb4323d8ddcb07c70

[S390] cio: improve error recovery for internal I/Os

Improve error recovery for internal I/Os by repeating each I/O
256 times per path to cope with long-running non-permanent error
conditions. Also retry each path twice to cope with link flapping,
i.e. single paths becoming unavailable in the order in which they
are tried.

Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

drivers/s390/cio/device_id.c

diff --git a/drivers/s390/cio/device_id.c b/drivers/s390/cio/device_id.c
index 4728644..78a0b43 100644
--- a/drivers/s390/cio/device_id.c
+++ b/drivers/s390/cio/device_id.c
@@ -21,7 +21,7 @@
 #include "device.h"
 #include "io_sch.h"
 
-#define SENSE_ID_RETRIES	5
+#define SENSE_ID_RETRIES	256
 #define SENSE_ID_TIMEOUT	(10 * HZ)
 #define SENSE_ID_MIN_LEN	4
 #define SENSE_ID_BASIC_LEN	7