[SCSI] qla4xxx: set device state as per Link UP and LINK DOWN

Link Down -> Mark all devices missing
 Previously, the driver took no action on a Link Down,
 and waited for the I/O on a dead connection to timeout
 in the firmware before marking the DDB missing.

Link Up -> Mark all devices online
 F/W will do auto login to all the devices only once.
 After that its the responsibility of the driver to
 relogin to devices whenever there is :
        * Any sort of connection failure or
        * KATO expires indicating target has logged out or
        * I/O times out etc.

Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Signed-off-by: Karen Higgins <karen.higgins@qlogic.com>
Signed-off-by: Ravi Anand <ravi.anand@qlogic.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 11 insertions, 4 deletions

diff --git a/drivers/scsi/qla4xxx/ql4_isr.c b/drivers/scsi/qla4xxx/ql4_isr.c
index c196d55eae39..9db286df7ca0 100644
--- a/drivers/scsi/qla4xxx/ql4_isr.c
+++ b/drivers/scsi/qla4xxx/ql4_isr.c
@@ -498,15 +498,22 @@ static void qla4xxx_isr_decode_mailbox(struct scsi_qla_host * ha,
                         break;
 
                 case MBOX_ASTS_LINK_UP:
-                        DEBUG2(printk("scsi%ld: AEN %04x Adapter LINK UP\n",
-                                      ha->host_no, mbox_status));
                         set_bit(AF_LINK_UP, &ha->flags);
+                        if (test_bit(AF_INIT_DONE, &ha->flags))
+                                set_bit(DPC_LINK_CHANGED, &ha->dpc_flags);
+
+                        DEBUG2(printk(KERN_INFO "scsi%ld: AEN %04x Adapter"
+                                        " LINK UP\n", ha->host_no,
+                                        mbox_status));
                         break;
 
                 case MBOX_ASTS_LINK_DOWN:
-                        DEBUG2(printk("scsi%ld: AEN %04x Adapter LINK DOWN\n",
-                                      ha->host_no, mbox_status));
                         clear_bit(AF_LINK_UP, &ha->flags);
+                        set_bit(DPC_LINK_CHANGED, &ha->dpc_flags);
+
+                        DEBUG2(printk(KERN_INFO "scsi%ld: AEN %04x Adapter"
+                                        " LINK DOWN\n", ha->host_no,
+                                        mbox_status));
                         break;
 
                 case MBOX_ASTS_HEARTBEAT: