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Code Issues Releases Wiki Activity

drbd_disconnect: grab meta.socket mutex as well

Browse source 
Fixes a race and potential kernel panic if e.g. the worker was just
about to send a few P_RS_IS_IN_SYNC via the meta socket for checksum
based resync, while the receiver destroys the sockets in
drbd_disconnect.

To make sure no-one is using the meta socket,
it is not enough to stop the asender...
Grab the meta socket mutex before destroying it.

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 2010-03-03 02:25:33 +01:00 committed by Philipp Reisner
parent 676396d545
commit 4589d7f829
2 changed files with 4 additions and 3 deletions
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4
drivers/block/drbd/drbd_main.c
View file

@ -3173,14 +3173,18 @@ void drbd_free_bc(struct drbd_backing_dev *ldev)
void drbd_free_sock(struct drbd_conf *mdev)
{
if (mdev->data.socket) {
mutex_lock(&mdev->data.mutex);
kernel_sock_shutdown(mdev->data.socket, SHUT_RDWR);
sock_release(mdev->data.socket);
mdev->data.socket = NULL;
mutex_unlock(&mdev->data.mutex);
}
if (mdev->meta.socket) {
mutex_lock(&mdev->meta.mutex);
kernel_sock_shutdown(mdev->meta.socket, SHUT_RDWR);
sock_release(mdev->meta.socket);
mdev->meta.socket = NULL;
mutex_unlock(&mdev->meta.mutex);
}
}

3
drivers/block/drbd/drbd_receiver.c
View file

@ -3617,10 +3617,7 @@ static void drbd_disconnect(struct drbd_conf *mdev)
/* asender does not clean up anything. it must not interfere, either */
drbd_thread_stop(&mdev->asender);
mutex_lock(&mdev->data.mutex);
drbd_free_sock(mdev);
mutex_unlock(&mdev->data.mutex);
spin_lock_irq(&mdev->req_lock);
_drbd_wait_ee_list_empty(mdev, &mdev->active_ee);