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[S390] dasd: ignore unsolicited interrupts for DIAG

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For the DASD DIAG discipline IO is started through special diagnose
calls. Unsolicited interrupts may contain information about the device
itself. But this information is not needed because the device is not
used directly.
Fix the case that an unimplemented dicipline function may be called
by ignoring unsolicited interrupts for the DIAG disciplin.

Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Stefan Haberland 2010-10-25 16:10:49 +02:00 committed by Martin Schwidefsky
parent 6d00d00bf2
commit 56b86b615b
1 changed files with 14 additions and 9 deletions
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23
drivers/s390/block/dasd.c
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@ -1107,17 +1107,22 @@ void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm,
if (cqr)
memcpy(&cqr->irb, irb, sizeof(*irb));
device = dasd_device_from_cdev_locked(cdev);
if (!IS_ERR(device)) {
device->discipline->dump_sense_dbf(device, irb,
"unsolicited");
if ((device->features & DASD_FEATURE_ERPLOG))
device->discipline->dump_sense(device, cqr,
irb);
dasd_device_clear_timer(device);
device->discipline->handle_unsolicited_interrupt(device,
irb);
if (IS_ERR(device))
return;
/* ignore unsolicited interrupts for DIAG discipline */
if (device->discipline == dasd_diag_discipline_pointer) {
dasd_put_device(device);
return;
}
device->discipline->dump_sense_dbf(device, irb,
"unsolicited");
if ((device->features & DASD_FEATURE_ERPLOG))
device->discipline->dump_sense(device, cqr,
irb);
dasd_device_clear_timer(device);
device->discipline->handle_unsolicited_interrupt(device,
irb);
dasd_put_device(device);
return;
}