linux-kernel - Re: [PATCH] soundwire: fix initializing sysfs for same devices on different buses

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Message-ID: <2023100453-perfected-palm-3503@gregkh>
Date:   Wed, 4 Oct 2023 15:38:18 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Vinod Koul <vkoul@...nel.org>,
        Bard Liao <yung-chuan.liao@...ux.intel.com>,
        Sanyog Kale <sanyog.r.kale@...el.com>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Takashi Iwai <tiwai@...e.de>, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] soundwire: fix initializing sysfs for same devices on
 different buses

On Wed, Oct 04, 2023 at 09:16:47AM -0400, Pierre-Louis Bossart wrote:
> 
> 
> On 10/4/23 09:02, Krzysztof Kozlowski wrote:
> > If same devices with same device IDs are present on different soundwire
> > buses, the probe fails due to conflicting device names and sysfs
> > entries:
> > 
> >   sysfs: cannot create duplicate filename '/bus/soundwire/devices/sdw:0:0217:0204:00:0'
> > 
> > The link ID is 0 for both devices, so they should be differentiated by
> > bus ID.  Add the bus ID so, the device names and sysfs entries look
> > like:
> 
> I am pretty sure this will break Intel platforms by changing the device
> names.
> 
> sof_sdw.c:      else if (is_unique_device(adr_link, sdw_version, mfg_id,
> part_id,
> sof_sdw.c:
> "sdw:%01x:%04x:%04x:%02x", link_id,
> sof_sdw.c:
> "sdw:%01x:%04x:%04x:%02x:%01x", link_id,

device id name changes shouldn't break things, what is requring them to
look a specific way?

thanks,

greg k-h