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Commit dd795459 authored by Stefan Haberland's avatar Stefan Haberland Committed by Greg Kroah-Hartman
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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: default avatarStefan Haberland <sth@linux.vnet.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: default avatarSasha Levin <alexander.levin@verizon.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 4220879c

drivers/s390/block/dasd.c

+5 −2
Original line number Diff line number Diff line
@@ -1672,9 +1672,12 @@ 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);

		if (!IS_ERR(device)) {

			device->discipline->check_attention(device,

							    irb->esw.esw1.lpum);

			dasd_put_device(device);

		}

	}



	if (!cqr)

		return;