linux-kernel - Re: [PATCH 2/6] mfd: rtsx_usb: fix platform device-id collision

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Date:	Tue, 7 Oct 2014 10:22:58 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Johan Hovold <johan@...nel.org>
Cc:	Samuel Ortiz <sameo@...ux.intel.com>,
	Jiri Kosina <jkosina@...e.cz>, linux-input@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH 2/6] mfd: rtsx_usb: fix platform device-id collision

On Fri, 26 Sep 2014, Johan Hovold wrote:

> Hot-pluggable multi-function devices should use PLATFORM_DEVID_AUTO to
> avoid name collisions on the platform bus.
> 
> This driver currently uses the USB-device address as an id. This makes
> name collisions unlikely, but it could still happen if two devices are
> connected to separate buses and gets assigned the same address.
> 
> Signed-off-by: Johan Hovold <johan@...nel.org>
> ---
>  drivers/mfd/rtsx_usb.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

This patch is superfluous.

Just wait until the hotpluggable version is applied, then use it.

> diff --git a/drivers/mfd/rtsx_usb.c b/drivers/mfd/rtsx_usb.c
> index 71f387ce8cbd..78073e4b87e4 100644
> --- a/drivers/mfd/rtsx_usb.c
> +++ b/drivers/mfd/rtsx_usb.c
> @@ -647,7 +647,7 @@ static int rtsx_usb_probe(struct usb_interface *intf,
>  	/* initialize USB SG transfer timer */
>  	setup_timer(&ucr->sg_timer, rtsx_usb_sg_timed_out, (unsigned long) ucr);
>  
> -	ret = mfd_add_devices(&intf->dev, usb_dev->devnum, rtsx_usb_cells,
> +	ret = mfd_add_devices(&intf->dev, PLATFORM_DEVID_AUTO, rtsx_usb_cells,
>  			ARRAY_SIZE(rtsx_usb_cells), NULL, 0, NULL);
>  	if (ret)
>  		goto out_init_fail;

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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