tty_open can return to userspace holding tty_mutex
__tty_open could return (to userspace) holding the tty_mutex thanks to a regression introduced by 4a2b5fdd ("Move tty lookup/reopen to caller"). This was found by bisecting an fsfuzzer problem. Admittedly I have no idea how it managed to tickle this 100% reliably, but it is clearly a regression and when hit leaves the box in a completely unusable state. This patch lets the fsfuzzer test complete every time. Signed-off-by: NEric Paris <eparis@redhat.com> Signed-off-by: NAlan Cox <alan@lxorguk.ukuu.org.uk> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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