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authorStefan Haberland <sth@linux.vnet.ibm.com>2017-01-25 16:47:32 +0300
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2017-01-31 12:47:15 +0300
commit2202134e48a3b50320aeb9e3dd1186833e9d7e66 (patch)
treed6e73bfe17509597353206f761d22f0b4b78ae17 /drivers/s390
parentdefc2a9b9899511445cfbaa2c3a6509964b71207 (diff)
downloadlinux-2202134e48a3b50320aeb9e3dd1186833e9d7e66.tar.xz
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')
-rw-r--r--drivers/s390/block/dasd.c7
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)