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- "Levin, Alexander (Sasha Levin)"
- "Levin, Alexander (Sasha Levin)"
- "Levin, Alexander (Sasha Levin)"
- "Levin, Alexander (Sasha Levin)"
- "Levin, Alexander (Sasha Levin)"
- "Levin, Alexander (Sasha Levin)"
- "Levin, Alexander (Sasha Levin)"
- "Levin, Alexander (Sasha Levin)"
- "Levin, Alexander (Sasha Levin)"
- "Levin, Alexander (Sasha Levin)"
- "Levin, Alexander (Sasha Levin)"
- "Levin, Alexander (Sasha Levin)"
Patch in this message | | | From | "Levin, Alexander (Sasha Levin)" <> | Subject | [PATCH review for 3.18 11/12] s390/dasd: check for device error pointer within state change interrupts | Date | Sat, 7 Oct 2017 22:38:01 +0000 |
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From: Stefan Haberland <sth@linux.vnet.ibm.com>
[ 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> --- drivers/s390/block/dasd.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c index 35672b081254..7c73388f8c1c 100644 --- a/drivers/s390/block/dasd.c +++ b/drivers/s390/block/dasd.c @@ -1672,8 +1672,11 @@ 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) -- 2.11.0
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