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authorStefan Haberland <sth@linux.vnet.ibm.com>2017-10-07 22:37:49 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-11-08 10:06:30 +0100
commit4b7a35866b0ca4205ec5bacd2a5531caf19a463f (patch)
treefff21435db63742f453979c4956f7dd7f7221ce1
parent45a012ace954efc08670fd6cd5698facbcdb119c (diff)
s390/dasd: check for device error pointer within state change interrupts
[ Upstream commit 2202134e48a3b50320aeb9e3dd1186833e9d7e66 ] 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> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-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 84c13dffa3a8..e7a6f1222642 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -1635,8 +1635,11 @@ 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)