[SCSI] qla4xxx: Handle one H/W Interrupt at a time

Handle one H/W Interrupt at a time to prevent holding off H/W lock
for longer period of time.
Signed-off-by: NRavi Anand <ravi.anand@qlogic.com>
Signed-off-by: NVikas Chaudhary <vikas.chaudhary@qlogic.com>
Reviewed-by: NMike Christie <michaelc@cs.wisc.edu>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

drivers/scsi/qla4xxx/ql4_def.h

@@ -118,7 +118,7 @@
 #define DRIVER_NAME			"qla4xxx"
 
 #define MAX_LINKED_CMDS_PER_LUN		3
-#define MAX_REQS_SERVICED_PER_INTR	16
+#define MAX_REQS_SERVICED_PER_INTR	1
 
 #define ISCSI_IPADDR_SIZE		4	/* IP address size */
 #define ISCSI_ALIAS_SIZE		32	/* ISCSI Alias name size */