linux-kernel - Re: [PATCH] of: Check 'of_node_reused' flag on of_match

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Date:   Thu, 20 Jan 2022 11:31:25 -0600
From:   Rob Herring <robh@...nel.org>
To:     Rob Herring <robh@...nel.org>
Cc:     Charles Keepax <ckeepax@...nsource.cirrus.com>,
        linux-kernel@...r.kernel.org, Peter Chen <peter.chen@....com>,
        Frank Rowand <frowand.list@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devicetree@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
        Tony Lindgren <tony@...mide.com>,
        Peter Chen <peter.chen@...nel.org>
Subject: Re: [PATCH] of: Check 'of_node_reused' flag on of_match_device()

On Tue, 18 Jan 2022 11:34:04 -0600, Rob Herring wrote:
> Commit 0f153a1b8193 ("usb: chipidea: Set the DT node on the child
> device") caused the child device to match on the parent driver
> instead of the child's driver since the child's DT node pointer matched.
> The worst case result is a loop of the parent driver probing another
> instance and creating yet another child device eventually exhausting the
> stack. If the child driver happens to match first, then everything works
> fine.
> 
> A device sharing the DT node should never do DT based driver matching,
> so let's simply check of_node_reused in of_match_device() to prevent
> that.
> 
> Fixes: 0f153a1b8193 ("usb: chipidea: Set the DT node on the child device")
> Link: https://lore.kernel.org/all/20220114105620.GK18506@ediswmail.ad.cirrus.com/
> Reported-by: Charles Keepax <ckeepax@...nsource.cirrus.com>
> Cc: Frank Rowand <frowand.list@...il.com>
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: Tony Lindgren <tony@...mide.com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Peter Chen <peter.chen@....com>
> Tested-by: Charles Keepax <ckeepax@...nsource.cirrus.com>
> Signed-off-by: Rob Herring <robh@...nel.org>
> ---
>  drivers/of/device.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 

Applied, thanks!