[PATCH] s390: tape retry flooding by deferred CC in interrupt

[mirror_ubuntu-zesty-kernel.git] / drivers / s390 / char / tape_core.c

diff --git a/drivers/s390/char/tape_core.c b/drivers/s390/char/tape_core.c
index 4ea438c749c9c6f4764ea1056c1baae1d1c52446..c42f5e25024efab3535094f593004b3180deea17 100644 (file)
--- a/drivers/s390/char/tape_core.c
+++ b/drivers/s390/char/tape_core.c
@@ -1064,15 +1064,16 @@ __tape_do_irq (struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
        /*
         * If the condition code is not zero and the start function bit is
         * still set, this is an deferred error and the last start I/O did
-        * not succeed. Restart the request now.
+        * not succeed. At this point the condition that caused the deferred
+        * error might still apply. So we just schedule the request to be
+        * started later.
         */
        if (irb->scsw.cc != 0 && (irb->scsw.fctl & SCSW_FCTL_START_FUNC)) {
                PRINT_WARN("(%s): deferred cc=%i. restaring\n",
                        cdev->dev.bus_id,
                        irb->scsw.cc);
-               rc = __tape_start_io(device, request);
-               if (rc)
-                       __tape_end_request(device, request, rc);
+               request->status = TAPE_REQUEST_QUEUED;
+               schedule_work(&device->tape_dnr);
                return;
        }