From: Stefan Haberland Date: Wed, 25 Jul 2018 11:27:10 +0000 (+0200) Subject: s390/dasd: fix panic for failed online processing X-Git-Tag: v5.15~8281^2~1 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=7c6553d4db03350dad0110c3224194c19df76a8f;p=platform%2Fkernel%2Flinux-starfive.git s390/dasd: fix panic for failed online processing Fix a panic that occurs for a device that got an error in dasd_eckd_check_characteristics() during online processing. For example the read configuration data command may have failed. If this error occurs the device is not being set online and the earlier invoked steps during online processing are rolled back. Therefore dasd_eckd_uncheck_device() is called which needs a valid private structure. But this pointer is not valid if dasd_eckd_check_characteristics() has failed. Check for a valid device->private pointer to prevent a panic. Reviewed-by: Jan Hoeppner Signed-off-by: Stefan Haberland Signed-off-by: Martin Schwidefsky --- diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c index c5a5551..1e97378 100644 --- a/drivers/s390/block/dasd_eckd.c +++ b/drivers/s390/block/dasd_eckd.c @@ -1780,6 +1780,9 @@ static void dasd_eckd_uncheck_device(struct dasd_device *device) struct dasd_eckd_private *private = device->private; int i; + if (!private) + return; + dasd_alias_disconnect_device_from_lcu(device); private->ned = NULL; private->sneq = NULL;