[SCSI] qla2xxx: Correct synchronization issues during rport addition/deletion.

The driver can typically detect port-loss during an
interrupt context (i.e. via interrogation of a status IOCB's
completion status [CS_PORT_LOGGED_OUT].  Due to the calling
requirements of the fc_rport APIs, the driver would defer
removal of the device to the default workqueue.  If the
work-item was preceded by an event which caused the port to
obtain visibility (relogin successful, target re-logged into
the topology), deferred removal could inadvertently drop the
rport.  The code also no longer defers removal via the
default workqueue, instead opting for use of the driver's
own DPC thread.

Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/scsi/qla2xxx/qla_def.h b/drivers/scsi/qla2xxx/qla_def.h
index 79d8a914f9d0..bad066e5772a 100644
--- a/drivers/scsi/qla2xxx/qla_def.h
+++ b/drivers/scsi/qla2xxx/qla_def.h
@@ -1680,7 +1680,8 @@ typedef struct fc_port {
         uint8_t mp_byte;                /* multi-path byte (not used) */
         uint8_t cur_path;               /* current path id */
 
-        struct fc_rport *rport;
+        spinlock_t rport_lock;
+        struct fc_rport *rport, *drport;
         u32 supported_classes;
         struct work_struct rport_add_work;
         struct work_struct rport_del_work;
@@ -2270,6 +2271,7 @@ typedef struct scsi_qla_host {
 #define LOOP_RESET_NEEDED       24
 #define BEACON_BLINK_NEEDED     25
 #define REGISTER_FDMI_NEEDED    26
+#define FCPORT_UPDATE_NEEDED    27
 
         uint32_t        device_flags;
 #define DFLG_LOCAL_DEVICES              BIT_0