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b68f2fb9e7
The port lock is used to protect the port state. However the port structure is freed on a hangup, then the lock taken on a close. The right fix is to drop the port on tty->shutdown() but we can't yet do that due to sleep v non-sleeping rules. Instead do the next best thing and fix it up when we are not in -rc season. Reported-by: Daniel Mack <daniel@caiaq.de> Signed-off-by: Alan Cox <alan@linux.intel.com> Tested-by: Daniel Mack <daniel@caiaq.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>