[S390] dasd: Improve handling of stolen DASD reservation

If a DASD device has been reserved by a Linux system, and later
this reservation is ‘stolen’ by a second system by means of an
unconditional reserve, then the first system receives a
notification about this fact. With this patch such an event can
be either ignored, as before, or it can be used to let the device
fail all I/O request, so that the device will not block anymore.

Signed-off-by: Stefan Weinhuber <wein@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 5 insertions, 13 deletions

diff --git a/drivers/s390/block/dasd_fba.c b/drivers/s390/block/dasd_fba.c
index 86bacda2c5f6..be89b3a893da 100644
--- a/drivers/s390/block/dasd_fba.c
+++ b/drivers/s390/block/dasd_fba.c
@@ -233,24 +233,16 @@ dasd_fba_erp_postaction(struct dasd_ccw_req * cqr)
         return NULL;
 }
 
-static void dasd_fba_handle_unsolicited_interrupt(struct dasd_device *device,
-                                                   struct irb *irb)
+static void dasd_fba_check_for_device_change(struct dasd_device *device,
+                                             struct dasd_ccw_req *cqr,
+                                             struct irb *irb)
 {
         char mask;
 
         /* first of all check for state change pending interrupt */
         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
-        if ((irb->scsw.cmd.dstat & mask) == mask) {
+        if ((irb->scsw.cmd.dstat & mask) == mask)
                 dasd_generic_handle_state_change(device);
-                return;
-        }
-
-        /* check for unsolicited interrupts */
-        DBF_DEV_EVENT(DBF_WARNING, device, "%s",
-                    "unsolicited interrupt received");
-        device->discipline->dump_sense_dbf(device, irb, "unsolicited");
-        dasd_schedule_device_bh(device);
-        return;
 };
 
 static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device * memdev,
@@ -605,7 +597,7 @@ static struct dasd_discipline dasd_fba_discipline = {
         .handle_terminated_request = dasd_fba_handle_terminated_request,
         .erp_action = dasd_fba_erp_action,
         .erp_postaction = dasd_fba_erp_postaction,
-        .handle_unsolicited_interrupt = dasd_fba_handle_unsolicited_interrupt,
+        .check_for_device_change = dasd_fba_check_for_device_change,
         .build_cp = dasd_fba_build_cp,
         .free_cp = dasd_fba_free_cp,
         .dump_sense = dasd_fba_dump_sense,