[SCSI] zfcp: fix: allow more time for adapter initialization

From: Maxim Shchetynin <maxim@de.ibm.com>

Extend the time for adapter initialization: In case of protocol
status HOST_CONNECTION_INITIALIZING for the exchange config data
command do a first retry in 1 second, then double the sleep time for
each following retry until recovery exceeds 2 minutes. The old
behaviour of allowing 6 retries with .5 seconds delay between retries
was insufficient and qdio queues were shut down too erarly.

Signed-off-by: Andreas Herrmann <aherrman@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/s390/scsi/zfcp_def.h b/drivers/s390/scsi/zfcp_def.h
index ead324019ff2..08369b9dad68 100644
--- a/drivers/s390/scsi/zfcp_def.h
+++ b/drivers/s390/scsi/zfcp_def.h
@@ -149,8 +149,10 @@ typedef u32 scsi_lun_t;
 #define FSF_QTCB_UNSOLICITED_STATUS             0x6305
 #define ZFCP_STATUS_READ_FAILED_THRESHOLD       3
 #define ZFCP_STATUS_READS_RECOM                 FSF_STATUS_READS_RECOM
-#define ZFCP_EXCHANGE_CONFIG_DATA_RETRIES       6
-#define ZFCP_EXCHANGE_CONFIG_DATA_SLEEP         50
+
+/* Do 1st retry in 1 second, then double the timeout for each following retry */
+#define ZFCP_EXCHANGE_CONFIG_DATA_FIRST_SLEEP   100
+#define ZFCP_EXCHANGE_CONFIG_DATA_RETRIES       7
 
 /* timeout value for "default timer" for fsf requests */
 #define ZFCP_FSF_REQUEST_TIMEOUT (60*HZ);