On Sat, Sep 17, 2016 at 03:19:52AM +0200, Peter Zijlstra wrote: > 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) <peterz@xxxxxxxxxxxxx> Oops, I overlooked that I need your ack as well :) Thanks! > > 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... Afraid so.
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