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qeth: ungrouping a device must not be interruptible

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Problem:
A recovery thread must not be active when device is removed.
In qeth_remove_device() an interruptible wait operation is used
to wait until a qeth recovery thread is finished. If a user really
interrupts the ungroup operation of a qeth device while a recovery
is running, cio and qeth are out of sync (device already removed
from cio, but kept in qeth). A following module unload of qeth
results in a kernel OOPS here.

Solution:
Do not allow interruption of ungroup operation to guarantee
finishing of a potentially running qeth recovery thread.

Signed-off-by: Ursula Braun <braunu@de.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Ursula Braun 2007-08-29 11:26:52 +02:00 committed by Jeff Garzik
parent 3052246c81
commit d0a34f98d1
1 changed files with 2 additions and 3 deletions
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5
drivers/s390/net/qeth_main.c
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@ -561,7 +561,7 @@ qeth_set_offline(struct ccwgroup_device *cgdev)
}
static int
qeth_wait_for_threads(struct qeth_card *card, unsigned long threads);
qeth_threads_running(struct qeth_card *card, unsigned long threads);
static void
@ -576,8 +576,7 @@ qeth_remove_device(struct ccwgroup_device *cgdev)
if (!card)
return;
if (qeth_wait_for_threads(card, 0xffffffff))
return;
wait_event(card->wait_q, qeth_threads_running(card, 0xffffffff) == 0);
if (cgdev->state == CCWGROUP_ONLINE){
card->use_hard_stop = 1;