Hi On Tue, Jun 13, 2017 at 11:56 AM, Benjamin Tissoires <[email protected]> wrote: >> > - struct semaphore driver_lock; /* >> > protects the current driver, except during input */ >> > + struct mutex driver_lock; /* >> > protects the current driver, except during input */ >> > struct semaphore driver_input_lock; /* >> > protects the current driver */ > > Unless I am mistaken, this one could also be converted to a mutex (in a > separate patch, of course).
The mutex code clearly states mutex_trylock() must not be used in interrupt context (see kernel/locking/mutex.c), hence we used a semaphore here. Unless the mutex code is changed to allow this, we cannot switch away from semaphores. Otherwise, this patch (given Benjamin's comments are addressed) looks good: Reviewed-by: David Herrmann <[email protected]> Thanks David
