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nbd: take tx_lock before disconnecting

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We need to take the tx_lock so we don't interleave our disconnect
request between real data going down the wire.

Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Josef Bacik 2017-07-21 10:48:14 -04:00 committed by Jens Axboe
parent 2e13456fb3
commit b4b2aeccf0
1 changed files with 4 additions and 0 deletions
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4
drivers/block/nbd.c
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@ -978,11 +978,15 @@ static void send_disconnects(struct nbd_device *nbd)
int i, ret;
for (i = 0; i < config->num_connections; i++) {
struct nbd_sock *nsock = config->socks[i];
iov_iter_kvec(&from, WRITE | ITER_KVEC, &iov, 1, sizeof(request));
mutex_lock(&nsock->tx_lock);
ret = sock_xmit(nbd, i, 1, &from, 0, NULL);
if (ret <= 0)
dev_err(disk_to_dev(nbd->disk),
"Send disconnect failed %d\n", ret);
mutex_unlock(&nsock->tx_lock);
}
}