[SCSI] ibmvscsi: handle re-enable firmware message

New versions of the Power5 firmware can send a "re-enable" message to
the virtual scsi adapter.  This fix makes us handle the message
correctly.  Without it, the driver goes catatonic and the system crashes
unpleasantly.

Signed-off-by: Dave Boutcher <sleddog@us.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/drivers/scsi/ibmvscsi/rpa_vscsi.c b/drivers/scsi/ibmvscsi/rpa_vscsi.c
index 75db2f5c545e..f47dd87c05e7 100644
--- a/drivers/scsi/ibmvscsi/rpa_vscsi.c
+++ b/drivers/scsi/ibmvscsi/rpa_vscsi.c
@@ -281,6 +281,28 @@ int ibmvscsi_init_crq_queue(struct crq_queue *queue,
 }
 
 /**
+ * reenable_crq_queue: - reenables a crq after
+ * @queue:      crq_queue to initialize and register
+ * @hostdata:   ibmvscsi_host_data of host
+ *
+ */
+int ibmvscsi_reenable_crq_queue(struct crq_queue *queue,
+                                 struct ibmvscsi_host_data *hostdata)
+{
+        int rc;
+        struct vio_dev *vdev = to_vio_dev(hostdata->dev);
+
+        /* Re-enable the CRQ */
+        do {
+                rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
+        } while ((rc == H_InProgress) || (rc == H_Busy) || (H_isLongBusy(rc)));
+
+        if (rc)
+                printk(KERN_ERR "ibmvscsi: Error %d enabling adapter\n", rc);
+        return rc;
+}
+
+/**
  * reset_crq_queue: - resets a crq after a failure
  * @queue:      crq_queue to initialize and register
  * @hostdata:   ibmvscsi_host_data of host