[PATCH review for 4.9 44/50] s390/dasd: check for device error pointer within state change interrupts

From: Stefan Haberland [ 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 Signed-off-by:

[PATCH review for 4.9 44/50] s390/dasd: check for device error pointer within state change interrupts

From: Stefan Haberland [ 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 Signed-off-by: Martin Schwidefsky Signed-off-by: Sasha Levin