From 56b86b615b807e043339979878a2de88f900ee4f Mon Sep 17 00:00:00 2001 From: Stefan Haberland Date: Mon, 25 Oct 2010 16:10:49 +0200 Subject: [PATCH] [S390] dasd: ignore unsolicited interrupts for DIAG 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 Signed-off-by: Martin Schwidefsky --- drivers/s390/block/dasd.c | 23 ++++++++++++++--------- 1 file changed, 14 insertions(+), 9 deletions(-) diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c index 80e45de096a9..fb613d70c2cb 100644 --- a/drivers/s390/block/dasd.c +++ b/drivers/s390/block/dasd.c @@ -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; }