linux-kernel - Re: [PATCH v2 2/6] phy: core: Fix that API devm_of_phy_provider_unregister() fails to unregister the phy provider

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Message-ID: <ZyDmdsHtxo-gFIFH@hovoldconsulting.com>
Date: Tue, 29 Oct 2024 14:43:18 +0100
From: Johan Hovold <johan@...nel.org>
To: Zijun Hu <zijun_hu@...oud.com>
Cc: Vinod Koul <vkoul@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Rob Herring <robh@...nel.org>, Arnd Bergmann <arnd@...db.de>,
	Lee Jones <lee@...nel.org>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Christophe JAILLET <christophe.jaillet@...adoo.fr>,
	stable@...r.kernel.org, linux-phy@...ts.infradead.org,
	linux-kernel@...r.kernel.org, Zijun Hu <quic_zijuhu@...cinc.com>
Subject: Re: [PATCH v2 2/6] phy: core: Fix that API
 devm_of_phy_provider_unregister() fails to unregister the phy provider

On Thu, Oct 24, 2024 at 10:39:27PM +0800, Zijun Hu wrote:
> From: Zijun Hu <quic_zijuhu@...cinc.com>
> 
> For devm_of_phy_provider_unregister(), its comment says it needs to invoke
> of_phy_provider_unregister() to unregister the phy provider, but it does
> not invoke the function actually since devres_destroy() will not call
> devm_phy_provider_release() at all which will call the function, and the
> missing of_phy_provider_unregister() call will case:

Please split this up in two sentences as well.

> - The phy provider fails to be unregistered.
> - Leak both memory and the OF node refcount.

Perhaps a comment about there not being any in-tree users of this API is
in place here?

And you could consider dropping the function altogether as well.

> Fixed by using devres_release() instead of devres_destroy() within the API.
> 
> Fixes: ff764963479a ("drivers: phy: add generic PHY framework")
> Cc: stable@...r.kernel.org
> Signed-off-by: Zijun Hu <quic_zijuhu@...cinc.com>

Looks good otherwise.

Johan