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

From: Johan Hovold
Date: Tue Oct 07 2014 - 08:55:56 EST


On Tue, Oct 07, 2014 at 10:22:58AM +0100, Lee Jones wrote:
> 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@xxxxxxxxxx>
> > ---
> > drivers/mfd/rtsx_usb.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
>
> This patch is superfluous.

Well, it would have documented the fact that there could be probe
failures due to id collisions with current and older kernels.

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

Fine with me. The collisions are quite unlikely anyway.

Thanks,
Johan

> > 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;
--
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