[PATCH] s390: device recognition

Close a small window where a device may be not operational again after senseid
finished and the "same device" check fails due to dev=0000 by checking for dnv
after stsch() by then setting the device to not operational. (No need to
check for dnv in ccw_device_handle_oper() again since we don't do stsch() into
the subchannel's schib in the meantime and will get a crw anyway if the device
becomes not oper again).

Signed-off-by: Cornelia Huck <[e-mail]>
Signed-off-by: Martin Schwidefsky <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/s390/cio/device_fsm.c

···
 		sch->schib.pmcw.pam &
 		sch->schib.pmcw.pom &
 		sch->opm;
+	/* Check since device may again have become not operational. */
+	if (!sch->schib.pmcw.dnv)
+		state = DEV_STATE_NOT_OPER;
 	if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID)
 		/* Force reprobe on all chpids. */
 		old_lpm = 0;