linux-kernel - Re: [PATCH v4 2/4] staging: greybus: gpio: Use gpiochip_get_data() in place of gpio_chip_to_gb_gpio

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Date:   Wed, 9 Jan 2019 11:58:24 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Nishad Kamdar <nishadkamdar@...il.com>
Cc:     Johan Hovold <johan@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alex Elder <elder@...nel.org>,
        Rui Miguel Silva <rmfrfs@...il.com>,
        greybus-dev@...ts.linaro.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/4] staging: greybus: gpio: Use gpiochip_get_data()
 in place of gpio_chip_to_gb_gpio_controller()

On Sat, Dec 22, 2018 at 08:21:00PM +0530, Nishad Kamdar wrote:
> This patch drops gpio_chip_to_gb_gpio_controller(),
> and uses gpiochip_get_data() to retrieve the container
> of struct gpio_chip.

So this will break the driver, since gpiochip_add() sets the data
pointer to NULL.

These kind of changes are getting too complicated to do without
something to test against. We had a module simulator at one point, but
not sure what the state of that is now.

I appreciate the effort though, and since we already started, let's try
to finish, but please drop this patch for now.

Johan