[{"id":3686141,"web_url":"http://patchwork.ozlabs.org/comment/3686141/","msgid":"<3e1a653b-81bc-4008-8f84-77c823aeef49@kernel.org>","date":"2026-05-05T05:37:05","subject":"Re: [PATCH net] net: wan: fsl_ucc_hdlc: free tx_skbuff in\n uhdlc_memclean","submitter":{"id":92089,"url":"http://patchwork.ozlabs.org/api/people/92089/","name":"Christophe Leroy (CS GROUP)","email":"chleroy@kernel.org"},"content":"Le 04/05/2026 à 18:11, Holger Brunck a écrit :\n> When cleaning up the resources we need to iterate over the\n> tx_skbuf array to free pending TX messages.\n> \n> Fixes: c19b6d246a35 (\"drivers/net: support hdlc function for QE-UCC\")\n> Signed-off-by: Holger Brunck \n> ---\n> drivers/net/wan/fsl_ucc_hdlc.c | 7 +++++++\n> 1 file changed, 7 insertions(+)\n> \n> diff --git a/drivers/net/wan/fsl_ucc_hdlc.c b/drivers/net/wan/fsl_ucc_hdlc.c\n> index adf3863463f5..68f78aeabdc3 100644\n> --- a/drivers/net/wan/fsl_ucc_hdlc.c\n> +++ b/drivers/net/wan/fsl_ucc_hdlc.c\n> @@ -739,6 +739,8 @@ static int uhdlc_open(struct net_device *dev)\n> \n> static void uhdlc_memclean(struct ucc_hdlc_private *priv)\n> {\n> +\tint i;\n> +\n> \tqe_muram_free(ioread16be(&priv->ucc_pram->riptr));\n> \tqe_muram_free(ioread16be(&priv->ucc_pram->tiptr));\n> \n> @@ -769,6 +771,11 @@ static void uhdlc_memclean(struct ucc_hdlc_private *priv)\n> \tkfree(priv->rx_skbuff);\n> \tpriv->rx_skbuff = NULL;\n> \n> +\tfor (i = 0; i < TX_BD_RING_LEN) {\n> +\t\tkfree(priv->tx_skbuff[i]);\n\nI don't think you can just kfree() an skb like this.\n\nI think you have to call dev_kfree_skb_any() instead.\n\nChristophe\n\n\n> +\t\tpriv->tx_skbuff[i] = NULL;\n> +\t}\n> +\n> \tkfree(priv->tx_skbuff);\n> \tpriv->tx_skbuff = NULL;\n>","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=TMKGNkLX;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=2404:9400:21b9:f100::1; helo=lists.ozlabs.org;\n envelope-from=linuxppc-dev+bounces-20439-incoming=patchwork.ozlabs.org@lists.ozlabs.org;\n receiver=patchwork.ozlabs.org)","lists.ozlabs.org;\n arc=none smtp.remote-ip=\"2600:3c0a:e001:78e:0:1991:8:25\"","lists.ozlabs.org;\n dmarc=pass (p=quarantine dis=none) header.from=kernel.org","lists.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=TMKGNkLX;\n\tdkim-atps=neutral","lists.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=kernel.org\n (client-ip=2600:3c0a:e001:78e:0:1991:8:25; 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charset=UTF-8; format=flowed","Content-Transfer-Encoding":"8bit","X-Spam-Status":"No, score=-0.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED,\n\tDKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_NONE,SPF_PASS\n\tautolearn=disabled version=4.0.1 OzLabs 8","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org"}},{"id":3686224,"web_url":"http://patchwork.ozlabs.org/comment/3686224/","msgid":"","date":"2026-05-05T08:33:34","subject":"RE: [PATCH net] net: wan: fsl_ucc_hdlc: free tx_skbuff in\n uhdlc_memclean","submitter":{"id":82682,"url":"http://patchwork.ozlabs.org/api/people/82682/","name":"Holger Brunck","email":"holger.brunck@hitachienergy.com"},"content":"> \n> Le 04/05/2026 à 18:11, Holger Brunck a écrit :\n> > When cleaning up the resources we need to iterate over the tx_skbuf\n> > array to free pending TX messages.\n> >\n> > Fixes: c19b6d246a35 (\"drivers/net: support hdlc function for QE-UCC\")\n> > Signed-off-by: Holger Brunck \n> > ---\n> > drivers/net/wan/fsl_ucc_hdlc.c | 7 +++++++\n> > 1 file changed, 7 insertions(+)\n> >\n> > diff --git a/drivers/net/wan/fsl_ucc_hdlc.c\n> > b/drivers/net/wan/fsl_ucc_hdlc.c index adf3863463f5..68f78aeabdc3\n> > 100644\n> > --- a/drivers/net/wan/fsl_ucc_hdlc.c\n> > +++ b/drivers/net/wan/fsl_ucc_hdlc.c\n> > @@ -739,6 +739,8 @@ static int uhdlc_open(struct net_device *dev)\n> >\n> > static void uhdlc_memclean(struct ucc_hdlc_private *priv)\n> > {\n> > + int i;\n> > +\n> > qe_muram_free(ioread16be(&priv->ucc_pram->riptr));\n> > qe_muram_free(ioread16be(&priv->ucc_pram->tiptr));\n> >\n> > @@ -769,6 +771,11 @@ static void uhdlc_memclean(struct ucc_hdlc_private\n> *priv)\n> > kfree(priv->rx_skbuff);\n> > priv->rx_skbuff = NULL;\n> >\n> > + for (i = 0; i < TX_BD_RING_LEN) {\n> > + kfree(priv->tx_skbuff[i]);\n> \n> I don't think you can just kfree() an skb like this.\n> \n> I think you have to call dev_kfree_skb_any() instead.\n> \n\nyes you are right or at least dev_kfree_skb() as the error handling code in\nucc_hdlc_tx does.\n\nThanks\nHolger","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=hitachienergy.com header.i=@hitachienergy.com\n header.a=rsa-sha256 header.s=selector1 header.b=aJmZDI/R;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=112.213.38.117; helo=lists.ozlabs.org;\n envelope-from=linuxppc-dev+bounces-20444-incoming=patchwork.ozlabs.org@lists.ozlabs.org;\n receiver=patchwork.ozlabs.org)","lists.ozlabs.org;\n arc=pass smtp.remote-ip=\"2a01:111:f403:c200::5\" arc.chain=microsoft.com","lists.ozlabs.org;\n dmarc=pass (p=quarantine dis=none) header.from=hitachienergy.com","lists.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=hitachienergy.com header.i=@hitachienergy.com\n header.a=rsa-sha256 header.s=selector1 header.b=aJmZDI/R;\n\tdkim-atps=neutral","lists.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=hitachienergy.com\n (client-ip=2a01:111:f403:c200::5;\n helo=duzpr83cu001.outbound.protection.outlook.com;\n envelope-from=holger.brunck@hitachienergy.com; 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a=rsa-sha256; c=relaxed/simple; d=kernel.org;\n\ts=k20201202; t=1778024857;\n\tbh=3r0ZNyX7X5IFV2nmj70h8MMAibad4YbMGo46z2KFL3k=;\n\th=Date:From:To:Cc:Subject:In-Reply-To:References:From;\n\tb=mSZqag/N7r8AJmkmWKSMWc2XDHcFWL0l2IRahDmpTvkdMKpw0q5vX/uyu1YxkwexJ\n\t OJEYOiGJiXJx/edjOD5FZ0SnOBHB5aBpjgoiy+OGXUW2gOYQAclwhnUE/wheB9K7kU\n\t J+V0ow0Mf25DcPNpw5YCZgeF4/zaFAJ2eWlpOxdqKgBpnSPCRIVih0Li0BIYc3nIzv\n\t Wxxm3XLwajFtHA2Iti3ZedeI3UGVgY9ZmDOHBKpMuYxsthWO5Je2ARt4n6OyPkb+lg\n\t 8xHsqfmznJ9lUUK8MiY2Tp1COk/s+/rIXhmTZ+nWHY7yY2v9bulRxbchQfXwSEOPp7\n\t Ie/iBEug+i0kw==","Date":"Tue, 5 May 2026 16:47:36 -0700","From":"Jakub Kicinski ","To":"Holger Brunck ","Cc":"\"Christophe Leroy (CS GROUP)\" ,\n \"netdev@vger.kernel.org\" ,\n \"linuxppc-dev@lists.ozlabs.org\" ,\n \"andrew+netdev@lunn.ch\" , \"qiang.zhao@nxp.com\"\n , \"horms@kernel.org\" ","Subject":"Re: [PATCH net] net: wan: fsl_ucc_hdlc: free tx_skbuff in\n uhdlc_memclean","Message-ID":"<20260505164736.26d203a8@kernel.org>","In-Reply-To":"\n ","References":"<20260504161145.2217950-1-holger.brunck@hitachienergy.com>\n\t<3e1a653b-81bc-4008-8f84-77c823aeef49@kernel.org>\n\t","X-Mailing-List":"linuxppc-dev@lists.ozlabs.org","List-Id":"","List-Help":"","List-Owner":"","List-Post":"","List-Archive":",\n ","List-Subscribe":",\n ,\n ","List-Unsubscribe":"","Precedence":"list","MIME-Version":"1.0","Content-Type":"text/plain; charset=US-ASCII","Content-Transfer-Encoding":"7bit","X-Spam-Status":"No, score=-0.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED,\n\tDKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_NONE,SPF_PASS\n\tautolearn=disabled version=4.0.1 OzLabs 8","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org"}},{"id":3686875,"web_url":"http://patchwork.ozlabs.org/comment/3686875/","msgid":"","date":"2026-05-06T08:27:40","subject":"RE: [PATCH net] net: wan: fsl_ucc_hdlc: free tx_skbuff in\n uhdlc_memclean","submitter":{"id":82682,"url":"http://patchwork.ozlabs.org/api/people/82682/","name":"Holger Brunck","email":"holger.brunck@hitachienergy.com"},"content":"> On Tue, 5 May 2026 08:33:34 +0000 Holger Brunck wrote:\n> > > I don't think you can just kfree() an skb like this.\n> > >\n> > > I think you have to call dev_kfree_skb_any() instead.\n> >\n> > yes you are right or at least dev_kfree_skb() as the error handling\n> > code in ucc_hdlc_tx does.\n> \n> Please make it clear in the commit message how you discovered the issue and\n> how you tested your patches.\n\ncurrently the driver is broken if you compile it as a module and try to reload it.\nThe issue was discovered by a sashiko review for a previous patch of me:\n https://sashiko.dev/#/patchset/20260429114208.941011-1-holger.brunck%40hitachienergy.com\n\nStill there are further issues remaining in the driver. I will update the patch and\nthe commit message.\n\nBest regards\nHolger","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=hitachienergy.com header.i=@hitachienergy.com\n header.a=rsa-sha256 header.s=selector1 header.b=XTJdgneD;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=2404:9400:21b9:f100::1; helo=lists.ozlabs.org;\n envelope-from=linuxppc-dev+bounces-20508-incoming=patchwork.ozlabs.org@lists.ozlabs.org;\n receiver=patchwork.ozlabs.org)","lists.ozlabs.org;\n arc=pass smtp.remote-ip=\"2a01:111:f403:c201::6\" arc.chain=microsoft.com","lists.ozlabs.org;\n dmarc=pass (p=quarantine dis=none) header.from=hitachienergy.com","lists.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=hitachienergy.com header.i=@hitachienergy.com\n header.a=rsa-sha256 header.s=selector1 header.b=XTJdgneD;\n\tdkim-atps=neutral","lists.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=hitachienergy.com\n (client-ip=2a01:111:f403:c201::6;\n helo=am0pr02cu008.outbound.protection.outlook.com;\n envelope-from=holger.brunck@hitachienergy.com; 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