[S390] dasd: fix message flood for unsolicited interrupts

In the unsolicited interupt handler fake IRBs from CIO have to be
ignored because there is nothing to do.
The function dump_sense should not be called if there is no sense
data available.

Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 20 insertions, 5 deletions

diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index 72d3970f11a..8095629bc49 100644
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -1501,12 +1501,27 @@ static void dasd_eckd_handle_unsolicited_interrupt(struct dasd_device *device,
                 return;
         }
 
-        /* just report other unsolicited interrupts */
-        DEV_MESSAGE(KERN_DEBUG, device, "%s",
-                    "unsolicited interrupt received");
-        device->discipline->dump_sense(device, NULL, irb);
-        dasd_schedule_device_bh(device);
+        if ((irb->scsw.cmd.cc == 1) &&
+            (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) &&
+            (irb->scsw.cmd.actl & SCSW_ACTL_START_PEND) &&
+            (irb->scsw.cmd.stctl & SCSW_STCTL_STATUS_PEND)) {
+                /* fake irb do nothing, they are handled elsewhere */
+                dasd_schedule_device_bh(device);
+                return;
+        }
 
+        if (!(irb->esw.esw0.erw.cons)) {
+                /* just report other unsolicited interrupts */
+                DEV_MESSAGE(KERN_ERR, device, "%s",
+                            "unsolicited interrupt received");
+        } else {
+                DEV_MESSAGE(KERN_ERR, device, "%s",
+                            "unsolicited interrupt received "
+                            "(sense available)");
+                device->discipline->dump_sense(device, NULL, irb);
+        }
+
+        dasd_schedule_device_bh(device);
         return;
 };