linux-kernel - Re: [PATCH] i2c: tiny-usb: check usb base class before assuming the interface on device is for this driver

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Date:   Thu, 27 Jul 2023 13:30:29 +0200
From:   Andi Shyti <andi.shyti@...nel.org>
To:     Harry Geyer <harry.geyer@...tank.co.uk>
Cc:     Till Harbaum <till@...baum.org>, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] i2c: tiny-usb: check usb base class before assuming the
 interface on device is for this driver

Hi Harry,

On Thu, Jul 27, 2023 at 09:33:54AM +0100, Harry Geyer wrote:
> Patch allows usb devices with multiple interfaces to use this driver without
> this driver assuming all interfaces are i2c-tiny-usb.
> 
> Signed-off-by: Harry Geyer <harry.geyer@...tank.co.uk>
> ---
>  drivers/i2c/busses/i2c-tiny-usb.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/i2c/busses/i2c-tiny-usb.c b/drivers/i2c/busses/i2c-tiny-usb.c
> index d1fa9ff5aeab..d6578e8908ac 100644
> --- a/drivers/i2c/busses/i2c-tiny-usb.c
> +++ b/drivers/i2c/busses/i2c-tiny-usb.c
> @@ -222,6 +222,9 @@ static int i2c_tiny_usb_probe(struct usb_interface *interface,
>  	int retval = -ENOMEM;
>  	u16 version;
>  
> +	if (interface->intf_assoc && interface->intf_assoc->bFunctionClass != USB_CLASS_VENDOR_SPEC)

I'm sorry, I meant the same column, my bad here!
Would you please be so kind to resend it as


	if (interface->intf_assoc &&
	    interface->intf_assoc->bFunctionClass != USB_CLASS_VENDOR_SPEC)

It's a nitpick, though.

On the other hand, checkpatch is OK with lines up to 100
characters and this one looks like it's withing that length. So,
up to your personal preference.

If you resend it, you can add my r-b.

Thank you and again, sorry,
Andi

PS Next time, please add a changelog and a versioning to
   following patches.

> +		return -ENODEV;
> +
>  	dev_dbg(&interface->dev, "probing usb device\n");
>  
>  	/* allocate memory for our device state and initialize it */
> -- 
> 2.34.1
>