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As reported by Vipul Gandhi, the current serial_match_port() doesn't work for tty-devices using dynamic major number allocation. Fix it. It oopses if you suspend a serial port with _dynamic_ major number. ATM, I think, there's only the drivers/serial/jsm/jsm_driver.c driver, that does it in-tree. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Tested-by: Vipul Gandhi <vcgandhi1@aol.com> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>