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    SubjectRe: [PATCH 2/7] driver core: create class_is_registered()
    On Fri, Mar 31, 2023 at 11:33 AM Greg Kroah-Hartman
    <gregkh@linuxfoundation.org> wrote:

    > Some classes (i.e. gpio), want to know if they have been registered or
    > not, and poke around in the class's internal structures to try to figure
    > this out. Because this is not really a good idea, provide a function
    > for classes to call to try to figure this out.
    >
    > Note, this is racy as the state of the class could change at any moment
    > in time after the call is made, but as usually a class only wants to
    > know if it has been registered yet or not, it should be fairly safe to
    > use, and is just as safe as the previous "poke at the class internals"
    > check was.
    >
    > Move the gpiolib code to use this function as proof that it works
    > properly.
    >
    > Cc: Linus Walleij <linus.walleij@linaro.org>
    > Cc: Bartosz Golaszewski <brgl@bgdev.pl>
    > Cc: Sebastian Reichel <sre@kernel.org>
    > Cc: Benjamin Tissoires <benjamin.tissoires@redhat.com>
    > Cc: linux-gpio@vger.kernel.org
    > Cc: "Rafael J. Wysocki" <rafael@kernel.org>
    > Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    This looks good to me!
    Reviewed-by: Linus Walleij <linus.walleij@linaro.org>

    Yours,
    Linus Walleij

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