scsi: qedf: Add additional checks when restarting an rport due to ABTS timeout

There are a couple of kernel cases when we restart a remote port due to
ABTS timeout that we need to handle:

 1. Flush any outstanding ABTS requests when flushing I/Os so that we do
    not hold up the eh_abort handler indefinitely causing process hangs.

 2. Check if we are currently uploading a connection before issuing an
    ABTS.

Signed-off-by: Chad Dupuis <chad.dupuis@cavium.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/qedf/qedf_io.c b/drivers/scsi/qedf/qedf_io.c
index 589414f..f669df0 100644 (file)
--- a/drivers/scsi/qedf/qedf_io.c
+++ b/drivers/scsi/qedf/qedf_io.c
@@ -1457,6 +1457,31 @@ void qedf_flush_active_ios(struct qedf_rport *fcport, int lun)
                        goto free_cmd;
                }
 
+               if (io_req->cmd_type == QEDF_ABTS) {
+                       rc = kref_get_unless_zero(&io_req->refcount);
+                       if (!rc) {
+                               QEDF_ERR(&(qedf->dbg_ctx),
+                                   "Could not get kref for abort io_req=0x%p xid=0x%x.\n",
+                                   io_req, io_req->xid);
+                               continue;
+                       }
+                       QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
+                           "Flushing abort xid=0x%x.\n", io_req->xid);
+
+                       clear_bit(QEDF_CMD_IN_ABORT, &io_req->flags);
+
+                       if (io_req->sc_cmd) {
+                               if (io_req->return_scsi_cmd_on_abts)
+                                       qedf_scsi_done(qedf, io_req, DID_ERROR);
+                       }
+
+                       /* Notify eh_abort handler that ABTS is complete */
+                       complete(&io_req->abts_done);
+                       kref_put(&io_req->refcount, qedf_release_cmd);
+
+                       goto free_cmd;
+               }
+
                if (!io_req->sc_cmd)
                        continue;
                if (lun > 0) {
@@ -1534,6 +1559,11 @@ int qedf_initiate_abts(struct qedf_ioreq *io_req, bool return_scsi_cmd_on_abts)
                goto abts_err;
        }
 
+       if (test_bit(QEDF_RPORT_UPLOADING_CONNECTION, &fcport->flags)) {
+               QEDF_ERR(&qedf->dbg_ctx, "fcport is uploading.\n");
+               rc = 1;
+               goto out;
+       }
 
        kref_get(&io_req->refcount);
 
@@ -1573,6 +1603,7 @@ abts_err:
         * task at the firmware.
         */
        qedf_initiate_cleanup(io_req, return_scsi_cmd_on_abts);
+out:
        return rc;
 }