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    SubjectRe: [RFC] Pushing device/driver binding decisions to userspace
    On Sun, Nov 12, 2006 at 09:22:44PM -0800, Ben Collins wrote:
    > On Sun, 2006-11-12 at 17:47 -0800, Nicholas Miell wrote:
    > > On Sun, 2006-11-12 at 17:24 -0800, Ben Collins wrote:
    > > > On Sun, 2006-11-12 at 16:49 -0800, Nicholas Miell wrote:
    > > > > On Sun, 2006-11-12 at 15:39 -0800, Ben Collins wrote:
    > > > >
    > > > > What's wrong with making udev or whatever unbind driver A and then bind
    > > > > driver B if the driver bound by the kernel ends up being the wrong
    > > > > choice? (Besides the inelegance of the kernel choosing one and then
    > > > > userspace immediately choosing the other, of course.)
    > > > >
    > > > > I'd argue that having multiple drivers for the same hardware is a bit
    > > > > strange to begin with, but that's another issue entirely.
    > > >
    > > > If two drivers are loaded for the same device, there's no way for udev
    > > > to tell the kernel which driver to use for a device, that I know of.
    > >
    > > /sys/bus/*/drivers/*/{bind,unbind}
    >
    > "bind" does not tell the driver core to "bind this device with this
    > driver", it tells it to "bind this driver to whatever devices we match
    > that aren't already bound".

    No it does not, it tells the driver core to "bind this device with this
    driver, _if_ the driver will accept it".

    > That doesn't solve my use case.

    Yes it does:
    echo -n BUS_ID > /sys/bus/foo_bus/drivers/foo_driver/unbind
    echo -n BUS_ID > /sys/bus/foo_bus/drivers/baz_driver/bind

    and you are set. That's the way other distros use this functionality :)

    thanks,

    greg k-h
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