fs/pipe: remove unnecessary spinlock from pipe_write()

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This reverts commit 8df441294d ("pipe: Check for ring full inside of
the spinlock in pipe_write()") which was obsoleted by commit
c73be61ced ("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>

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Max Kellermann 2023-09-21 09:57:54 +02:00 • committed by Christian Brauner

parent b4bd6b4bac

commit dfaabf916b

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fs/pipe.c

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