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| author | Stefan Haberland <sth@linux.vnet.ibm.com> | 2017-01-25 14:47:32 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2017-01-31 10:47:15 +0100 |
| commit | 2202134e48a3b50320aeb9e3dd1186833e9d7e66 (patch) | |
| tree | d6e73bfe17509597353206f761d22f0b4b78ae17 /drivers/s390/block | |
| parent | defc2a9b9899511445cfbaa2c3a6509964b71207 (diff) | |
| download | linux-2202134e48a3b50320aeb9e3dd1186833e9d7e66.tar.gz linux-2202134e48a3b50320aeb9e3dd1186833e9d7e66.tar.bz2 linux-2202134e48a3b50320aeb9e3dd1186833e9d7e66.zip | |
s390/dasd: check for device error pointer within state change interrupts
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>
Diffstat (limited to 'drivers/s390/block')
| -rw-r--r-- | drivers/s390/block/dasd.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c index 0e3fdfdbd098..f3099c8cc143 100644 --- a/drivers/s390/block/dasd.c +++ b/drivers/s390/block/dasd.c @@ -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) |