[PATCH] rxrpc: fix bad unlock balance in rxrpc_do_sendmsg

[David Howells]

Hawkins Jiawei <yin31149 at gmail.com> wrote:

> -		if (mutex_lock_interruptible(&call->user_mutex) < 0)
> +		if (mutex_lock_interruptible(&call->user_mutex) < 0) {
> +			mutex_lock(&call->user_mutex);

Yeah, as Khalid points out that kind of makes the interruptible lock
pointless.  Either rxrpc_send_data() needs to return a separate indication
that we returned without the lock held or it needs to always drop the lock on
error (at least for ERESTARTSYS/EINTR) which can be checked for higher up.

David