[PATCH] USB serial: Converts port semaphore to mutexes.
The usbserial's port semaphore used to synchronize serial_open() and serial_close() are strict mutexes, convert them to the mutex implementation. Signed-off-by: Luiz Capitulino <lcapitulino@mandriva.com.br> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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