[patch 3/4] s390: device recognition.

From: Martin Schwidefsky
Date: Fri Jul 29 2005 - 12:30:28 EST

From: Cornelia Huck <cohuck@xxxxxxxxxx>

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 <cohuck@xxxxxxxxxx>
Signed-off-by: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>

drivers/s390/cio/device_fsm.c | 3 +++
1 files changed, 3 insertions(+)

diff -urpN linux-2.6/drivers/s390/cio/device_fsm.c linux-2.6-patched/drivers/s390/cio/device_fsm.c
--- linux-2.6/drivers/s390/cio/device_fsm.c 2005-06-17 21:48:29.000000000 +0200
+++ linux-2.6-patched/drivers/s390/cio/device_fsm.c 2005-07-29 18:43:39.000000000 +0200
@@ -235,6 +235,9 @@ ccw_device_recog_done(struct ccw_device
sch->schib.pmcw.pam &
sch->schib.pmcw.pom &
+ /* Check since device may again have become not operational. */
+ if (!sch->schib.pmcw.dnv)
if (cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID)
/* Force reprobe on all chpids. */
old_lpm = 0;
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