linux-kernel - Re: [PATCH] soundwire: bus: fix off-by-one when allocating slave IDs

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Message-ID: <732ad24d-d88f-47dc-bb6f-bd1b64ad354e@web.de>
Date: Sun, 11 Jan 2026 10:27:08 +0100
From: Markus Elfring <Markus.Elfring@....de>
To: Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>,
 linux-sound@...r.kernel.org, Bard Liao <yung-chuan.liao@...ux.intel.com>,
 Charles Keepax <ckeepax@...nsource.cirrus.com>,
 Dan Carpenter <dan.carpenter@...aro.org>,
 Pierre-Louis Bossart <pierre-louis.bossart@...ux.dev>,
 Vinod Koul <vkoul@...nel.org>
Cc: kernel-janitors@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
 lkp@...el.com, Dan Carpenter <error27@...il.com>
Subject: Re: [PATCH] soundwire: bus: fix off-by-one when allocating slave IDs

…
> Using SDW_FW_MAX_DEVICES(16) therefore allows an ID of 16 to be
> allocated, but the IRQ domain created for the bus is sized for IDs
> 0-15.  If 16 is returned, irq_create_mapping() fails and the driver
> ends up with an invalid IRQ mapping.
…

See also once more:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?h=v6.19-rc4#n659

Regards,
Markus