[SCSI] qla4xxx: masking required bits of add_fw_options during initialization

Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Signed-off-by: Prasanna Mumbai <prasanna.mumbai@qlogic.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

2 files changed, 6 insertions, 0 deletions

diff --git a/drivers/scsi/qla4xxx/ql4_fw.h b/drivers/scsi/qla4xxx/ql4_fw.h
index c1985792f034..31e2bf97198c 100644
--- a/drivers/scsi/qla4xxx/ql4_fw.h
+++ b/drivers/scsi/qla4xxx/ql4_fw.h
@@ -455,6 +455,7 @@ struct addr_ctrl_blk {
         uint8_t res0;   /* 07 */
         uint16_t eth_mtu_size;  /* 08-09 */
         uint16_t add_fw_options;        /* 0A-0B */
+#define SERIALIZE_TASK_MGMT             0x0400
 
         uint8_t hb_interval;    /* 0C */
         uint8_t inst_num; /* 0D */
diff --git a/drivers/scsi/qla4xxx/ql4_mbx.c b/drivers/scsi/qla4xxx/ql4_mbx.c
index 199fa643cdad..f9d81c8372c3 100644
--- a/drivers/scsi/qla4xxx/ql4_mbx.c
+++ b/drivers/scsi/qla4xxx/ql4_mbx.c
@@ -476,6 +476,11 @@ int qla4xxx_initialize_fw_cb(struct scsi_qla_host * ha)
 
         init_fw_cb->fw_options &= __constant_cpu_to_le16(~FWOPT_TARGET_MODE);
 
+        /* Set bit for "serialize task mgmt" all other bits need to be zero */
+        init_fw_cb->add_fw_options = 0;
+        init_fw_cb->add_fw_options |=
+            __constant_cpu_to_le16(SERIALIZE_TASK_MGMT);
+
         if (qla4xxx_set_ifcb(ha, &mbox_cmd[0], &mbox_sts[0], init_fw_cb_dma)
                 != QLA_SUCCESS) {
                 DEBUG2(printk(KERN_WARNING