fs/pipe: remove unnecessary spinlock from pipe_write()
This reverts commit
8df441294dd3 ("pipe: Check for ring full inside of
the spinlock in pipe_write()") which was obsoleted by commit
c73be61cede ("pipe: Add general notification queue support") because
now pipe_write() fails early with -EXDEV if there is a watch_queue.
Without a watch_queue, no notifications can be posted to the pipe and
mutex protection is enough, as can be seen in splice_pipe_to_pipe()
which does not use the spinlock either.
Signed-off-by: Max Kellermann <max.kellermann@ionos.com>
Message-Id: <
20230921075755.
1378787-3-max.kellermann@ionos.com>
Reviewed-by: David Howells <dhowells@redhat.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>