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    SubjectRe: udev breakages - was: Re: Need of an ".async_probe()" type of callback at driver's core - Was: Re: [PATCH] [media] drxk: change it to use request_firmware_nowait()
    On Wed, Oct 3, 2012 at 10:39 PM, Linus Torvalds
    <torvalds@linux-foundation.org> wrote:
    > On Wed, Oct 3, 2012 at 12:50 PM, Greg KH <gregkh@linuxfoundation.org> wrote:
    >>>
    >>> Ok, like this?
    >>
    >> This looks good to me. Having udev do firmware loading and tieing it to
    >> the driver model may have not been such a good idea so many years ago.
    >> Doing it this way makes more sense.
    >
    > Ok, I wish this had been getting more testing in Linux-next or
    > something, but I suspect that what I'll do is to commit this patch
    > asap, and then commit another patch that turns off udev firmware
    > loading entirely for the synchronous firmware loading case.
    >
    > Why? Just to get more testing, and seeing if there are reports of
    > breakage. Maybe some udev out there has a different search path (or
    > because udev runs in a different filesystem namespace or whatever), in
    > which case running udev as a fallback would otherwise hide the fact
    > that he direct kernel firmware loading isn't working.

    > Ok? Comments?

    The current udev directory search order is:
    /lib/firmware/updates/$(uname -r)/
    /lib/firmware/updates/
    /lib/firmware/$(uname -r)/
    /lib/firmware/

    There is no commonly known /firmware directory.

    http://cgit.freedesktop.org/systemd/systemd/tree/src/udev/udev-builtin-firmware.c#n100
    http://cgit.freedesktop.org/systemd/systemd/tree/configure.ac#n548

    Kay


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