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OpenCloudOS-Kernel
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fix in-kernel configuration serialization 

this is uncritical, as we still also serialize in userland,
but to correctly serialize on the CONFIG_PENDING bit,
it must be wait_event(state_wait, \!test_and_set_bit)

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Lars Ellenberg 2009-11-16 15:48:54 +01:00 committed by Philipp Reisner
parent 32a87c0114
commit 6c6c7951be
1 changed files with 1 additions and 1 deletions
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2
drivers/block/drbd/drbd_nl.c
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@ -733,7 +733,7 @@ void drbd_setup_queue_param(struct drbd_conf *mdev, unsigned int max_seg_s) __mu
*/
static void drbd_reconfig_start(struct drbd_conf *mdev)
{
wait_event(mdev->state_wait, test_and_set_bit(CONFIG_PENDING, &mdev->flags));
wait_event(mdev->state_wait, !test_and_set_bit(CONFIG_PENDING, &mdev->flags));
wait_event(mdev->state_wait, !test_bit(DEVICE_DYING, &mdev->flags));
drbd_thread_start(&mdev->worker);
}