linux-kernel - RE: [net PATCH] net: fec: free fec queue when fec_enet_mii

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Date: Wed, 22 May 2024 07:28:02 +0000
From: Wei Fang <wei.fang@....com>
To: Andrew Lunn <andrew@...n.ch>, Xiaolei Wang <xiaolei.wang@...driver.com>
CC: Shenwei Wang <shenwei.wang@....com>, Clark Wang <xiaoning.wang@....com>,
	"davem@...emloft.net" <davem@...emloft.net>, "edumazet@...gle.com"
	<edumazet@...gle.com>, "kuba@...nel.org" <kuba@...nel.org>,
	"pabeni@...hat.com" <pabeni@...hat.com>, "imx@...ts.linux.dev"
	<imx@...ts.linux.dev>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [net PATCH] net: fec: free fec queue when fec_enet_mii_init()
 fails


> -----Original Message-----
> From: Andrew Lunn <andrew@...n.ch>
> Sent: 2024年5月22日 11:15
> To: Wei Fang <wei.fang@....com>
> Cc: Xiaolei Wang <xiaolei.wang@...driver.com>; Shenwei Wang
> <shenwei.wang@....com>; Clark Wang <xiaoning.wang@....com>;
> davem@...emloft.net; edumazet@...gle.com; kuba@...nel.org;
> pabeni@...hat.com; imx@...ts.linux.dev; netdev@...r.kernel.org;
> linux-kernel@...r.kernel.org
> Subject: Re: [net PATCH] net: fec: free fec queue when fec_enet_mii_init() fails
> 
> > The commit 59d0f7465644 ("net: fec: init multi queue date structure")
> > was the first to introduce this issue, commit 619fee9eb13b
> > ("net: fec: fix the potential memory leak in fec_enet_init() ") fixed
> > this, but it does not seem to be completely fixed.
> 
> This fix is also not great, and i would say the initial design is really the problem.
> There needs to be a function which is the opposite of fec_enet_init(). It can
> then be called in the probe cleanup code, and in fec_drv_remove() which also
> appears to leak the queues.
> 
Yes, this issue also exists when the fec driver is unbound, maybe Xiaolei can
help improve it in his patch.