On Fri, Sep 16, 2016 at 06:02:41PM +0200, Bartosz Golaszewski wrote: > If an I2C GPIO multiplexer is driven by a GPIO provided by an expander > when there's a second expander using the same device driver on one of > the I2C bus segments, lockdep prints a deadlock warning when trying to > set the direction or the value of the GPIOs provided by the second > expander. > > This series exports an already existing function from i2c-core as > public API and reuses it in pca953x to pass a correct lock subclass > to lockdep.
Acked-by: Peter Zijlstra (Intel) <pet...@infradead.org> > Note: if this series gets merged, I'll prepare follow-up patches for > other expanders for which a similar problem could potentially occur. We can't push this annotation into the i2c core, can we? Since the mutex is in driver specific code, not more generic...
