[SCSI] qla2xxx: Unload hangs after issuing BSG commands to vport.

BSG code path increments ref count in the send path, but does not
decrement in the return path leading to hang during unload of the
driver.

Signed-off-by: Chad Dupuis <chad.dupuis@qlogic.com>
Signed-off-by: Saurav Kashyap <saurav.kashyap@qlogic.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

drivers/scsi/qla2xxx/qla_bsg.c

@@ -27,7 +27,7 @@ void
 qla2x00_bsg_sp_free(void *data, void *ptr)
 {
 	srb_t *sp = (srb_t *)ptr;
-	struct scsi_qla_host *vha = (scsi_qla_host_t *)data;
+	struct scsi_qla_host *vha = sp->fcport->vha;
 	struct fc_bsg_job *bsg_job = sp->u.bsg_job;
 	struct qla_hw_data *ha = vha->hw;
 
@@ -40,7 +40,7 @@ qla2x00_bsg_sp_free(void *data, void *ptr)
 	if (sp->type == SRB_CT_CMD ||
 	    sp->type == SRB_ELS_CMD_HST)
 		kfree(sp->fcport);
-	mempool_free(sp, vha->hw->srb_mempool);
+	qla2x00_rel_sp(vha, sp);
 }
 
 int
@@ -368,7 +368,7 @@ qla2x00_process_els(struct fc_bsg_job *bsg_job)
 	if (rval != QLA_SUCCESS) {
 		ql_log(ql_log_warn, vha, 0x700e,
 		    "qla2x00_start_sp failed = %d\n", rval);
-		mempool_free(sp, ha->srb_mempool);
+		qla2x00_rel_sp(vha, sp);
 		rval = -EIO;
 		goto done_unmap_sg;
 	}
@@ -515,7 +515,7 @@ qla2x00_process_ct(struct fc_bsg_job *bsg_job)
 	if (rval != QLA_SUCCESS) {
 		ql_log(ql_log_warn, vha, 0x7017,
 		    "qla2x00_start_sp failed=%d.\n", rval);
-		mempool_free(sp, ha->srb_mempool);
+		qla2x00_rel_sp(vha, sp);
 		rval = -EIO;
 		goto done_free_fcport;
 	}
@@ -1995,6 +1995,6 @@ done:
 	spin_unlock_irqrestore(&ha->hardware_lock, flags);
 	if (bsg_job->request->msgcode == FC_BSG_HST_CT)
 		kfree(sp->fcport);
-	mempool_free(sp, ha->srb_mempool);
+	qla2x00_rel_sp(vha, sp);
 	return 0;
 }

drivers/scsi/qla2xxx/qla_init.c

@@ -70,9 +70,7 @@ qla2x00_sp_free(void *data, void *ptr)
 	struct scsi_qla_host *vha = (scsi_qla_host_t *)data;
 
 	del_timer(&iocb->timer);
-	mempool_free(sp, vha->hw->srb_mempool);
-
-	QLA_VHA_MARK_NOT_BUSY(vha);
+	qla2x00_rel_sp(vha, sp);
 }
 
 /* Asynchronous Login/Logout Routines -------------------------------------- */

drivers/scsi/qla2xxx/qla_inline.h

@@ -197,6 +197,13 @@ done:
 	return sp;
 }
 
+static inline void
+qla2x00_rel_sp(scsi_qla_host_t *vha, srb_t *sp)
+{
+	mempool_free(sp, vha->hw->srb_mempool);
+	QLA_VHA_MARK_NOT_BUSY(vha);
+}
+
 static inline void
 qla2x00_init_timer(srb_t *sp, unsigned long tmo)
 {

drivers/scsi/qla2xxx/qla_os.c

@@ -630,7 +630,7 @@ qla2x00_sp_free_dma(void *vha, void *ptr)
 	}
 
 	CMD_SP(cmd) = NULL;
-	mempool_free(sp, ha->srb_mempool);
+	qla2x00_rel_sp(sp->fcport->vha, sp);
 }
 
 static void
@@ -718,7 +718,7 @@ qla2xxx_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
 		goto qc24_target_busy;
 	}
 
-	sp = qla2x00_get_sp(base_vha, fcport, GFP_ATOMIC);
+	sp = qla2x00_get_sp(vha, fcport, GFP_ATOMIC);
 	if (!sp) {
 		set_bit(HOST_RAMP_DOWN_QUEUE_DEPTH, &vha->dpc_flags);
 		goto qc24_host_busy;