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authorUrsula Braun <braunu@de.ibm.com>2007-08-29 05:26:52 -0400
committerJeff Garzik <jeff@garzik.org>2007-08-31 06:52:57 -0400
commitd0a34f98d1da66a5b4e02171854e6c04c9916016 (patch)
treee56ea20b7a94744b9269a5c2a1b8327797bd8534 /drivers/s390/net
parent3052246c815fe17ff3a9fcb5601c6688b523e5f5 (diff)
qeth: ungrouping a device must not be interruptible
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>
Diffstat (limited to 'drivers/s390/net')
-rw-r--r--drivers/s390/net/qeth_main.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/drivers/s390/net/qeth_main.c b/drivers/s390/net/qeth_main.c
index 57f69434fbf9..ba10d42a1a56 100644
--- a/drivers/s390/net/qeth_main.c
+++ b/drivers/s390/net/qeth_main.c
@@ -561,7 +561,7 @@ qeth_set_offline(struct ccwgroup_device *cgdev)
561} 561}
562 562
563static int 563static int
564qeth_wait_for_threads(struct qeth_card *card, unsigned long threads); 564qeth_threads_running(struct qeth_card *card, unsigned long threads);
565 565
566 566
567static void 567static void
@@ -576,8 +576,7 @@ qeth_remove_device(struct ccwgroup_device *cgdev)
576 if (!card) 576 if (!card)
577 return; 577 return;
578 578
579 if (qeth_wait_for_threads(card, 0xffffffff)) 579 wait_event(card->wait_q, qeth_threads_running(card, 0xffffffff) == 0);
580 return;
581 580
582 if (cgdev->state == CCWGROUP_ONLINE){ 581 if (cgdev->state == CCWGROUP_ONLINE){
583 card->use_hard_stop = 1; 582 card->use_hard_stop = 1;