Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 3.18 24/27] s390/dasd: check for device error pointer within state change interrupts | Date | Mon, 6 Nov 2017 12:28:09 +0100 |
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3.18-stable review patch. If anyone has any objections, please let me know.
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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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- drivers/s390/block/dasd.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)
--- a/drivers/s390/block/dasd.c +++ b/drivers/s390/block/dasd.c @@ -1672,8 +1672,11 @@ void dasd_int_handler(struct ccw_device /* 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)
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