linux-kernel - Re: linux-next: build failure after merge of the input tree

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Date:   Wed, 17 Aug 2022 06:43:26 +0200
From:   Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Eddie James <eajames@...ux.ibm.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Wolfram Sang <wsa@...nel.org>
Subject: Re: linux-next: build failure after merge of the input tree

Hello,

On Wed, Aug 17, 2022 at 10:00:07AM +1000, Stephen Rothwell wrote:
> After merging the input tree, today's linux-next build (x86_64
> allmodconfig) failed like this:
> 
> drivers/input/misc/ibm-panel.c:195:19: error: initialization of 'void (*)(struct i2c_client *)' from incompatible pointer type 'int (*)(struct i2c_client *)' [-Werror=incompatible-pointer-types]
>   195 |         .remove = ibm_panel_remove,
>       |                   ^~~~~~~~~~~~~~~~
> drivers/input/misc/ibm-panel.c:195:19: note: (near initialization for 'ibm_panel_driver.remove')
> 
> Caused by commit
> 
>   95331e91e9da ("Input: Add IBM Operation Panel driver")
> 
> interacting with commit
> 
>   ed5c2f5fd10d ("i2c: Make remove callback return void")
> 
> from v6.0-rc1.

I was a bit irritated by the "from v6.0-rc1" part and I feared that I
missed a driver in the conversion of the remove callback. But both
commits happen after v6.0-rc1, so everything is fine and as expected.

> I have applied the following merge fix patch for today:
> 
> From: Stephen Rothwell <sfr@...b.auug.org.au>
> Date: Wed, 17 Aug 2022 09:54:11 +1000
> Subject: [PATCH] Input: fix up for "i2c: Make remove callback return void"
> 
> Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
> ---
>  drivers/input/misc/ibm-panel.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/input/misc/ibm-panel.c b/drivers/input/misc/ibm-panel.c
> index 54c657cd7809..094bcdb568f1 100644
> --- a/drivers/input/misc/ibm-panel.c
> +++ b/drivers/input/misc/ibm-panel.c
> @@ -174,11 +174,9 @@ static int ibm_panel_probe(struct i2c_client *client,
>  	return 0;
>  }
>  
> -static int ibm_panel_remove(struct i2c_client *client)
> +static void ibm_panel_remove(struct i2c_client *client)
>  {
>  	i2c_slave_unregister(client);
> -
> -	return 0;
>  }

That looks right. Wolfram created a tag for the conversion that can be
pulled into the input tree at

	https://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git i2c/make_remove_callback_void-immutable

.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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