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    SubjectRe: lockdep: incorrect deadlock warning with two GPIO expanders
    2016-09-15 15:39 GMT+02:00 Peter Zijlstra <peterz@infradead.org>:
    > On Thu, Sep 15, 2016 at 03:20:58PM +0200, Bartosz Golaszewski wrote:
    >> 2016-09-15 14:41 GMT+02:00 Linus Walleij <linus.walleij@linaro.org>:
    >> >> So can't you walk up that and see if you encounter the exact same driver
    >> >> again?
    >> >>
    >> >> Something like:
    >> >>
    >> >> for (nr = 0, parent = dev->parent; parent; parent = parent->parent) {
    >> >> if (parent->device_driver == &pca953x_driver.driver)
    >> >> nr++;
    >> >> }
    >> >
    >> > Oh clever. Of course.
    >> >
    >> > Bartosz can you try out this approach?
    >> >
    >>
    >> I think it may be more complicated than that, depending on the hw
    >> topology, but the general idea seems reasonable. I'll try this.
    >
    > Yeah, I figured there might be more to it.
    >
    > In any case, if this fails, we can always punt and simply count the
    > total number of instances of this driver on the system and go with that.
    >

    But for __mutex_init() to work with the key argument you need to know
    it at compile time, right?

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