Staging: comedi: dt9812: Use mutex instead of semaphore
Replace binary semaphore with mutex. Mutex also gives better performance than semaphore. Signed-off-by: Ksenija Stanojevic <ksenija.stanojevic@gmail.com> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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