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s390/dasd: check for device error pointer within state change interrupts

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Check if the device pointer is valid. Just a sanity check since we already
are in the int handler of the device.

Signed-off-by: Stefan Haberland <sth@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Stefan Haberland 2017-01-25 14:47:32 +01:00 committed by Martin Schwidefsky
parent defc2a9b98
commit 2202134e48
1 changed files with 5 additions and 2 deletions
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7
drivers/s390/block/dasd.c
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@ -1712,8 +1712,11 @@ void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm,
/* check for for attention message */
if (scsw_dstat(&irb->scsw) & DEV_STAT_ATTENTION) {
device = dasd_device_from_cdev_locked(cdev);
device->discipline->check_attention(device, irb->esw.esw1.lpum);
dasd_put_device(device);
if (!IS_ERR(device)) {
device->discipline->check_attention(device,
irb->esw.esw1.lpum);
dasd_put_device(device);
}
}
if (!cqr)