From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7277BE95A8E for ; Mon, 9 Oct 2023 13:54:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1377584AbjJINyr (ORCPT ); Mon, 9 Oct 2023 09:54:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37176 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1377580AbjJINyq (ORCPT ); Mon, 9 Oct 2023 09:54:46 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9082691 for ; Mon, 9 Oct 2023 06:54:44 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id CFECAC433C7; Mon, 9 Oct 2023 13:54:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1696859684; bh=cTEX8UXMPj921bxGHtygSE0RMFGWOJOtsm3P1KNjiH0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=YkdxUz0bLtdthUZiSQN0IuiYXwEC/sZPOCQpfTJp9I8BkW7P0mslG3E55dWaJFzYE Qhg3nYtUWEEfPFQQAt6/y2ihepQKcJ7vMl8kFYWEloMC0wYHmzftVBPpJm1AqloniA QSd+zPncwlofOwlCdkUigHbhVBZbC+mSOujg4hAQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Alexandra Diupina , Christophe Leroy , "David S. Miller" , Sasha Levin Subject: [PATCH 4.19 73/91] drivers/net: process the result of hdlc_open() and add call of hdlc_close() in uhdlc_close() Date: Mon, 9 Oct 2023 15:06:45 +0200 Message-ID: <20231009130114.059869324@linuxfoundation.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231009130111.518916887@linuxfoundation.org> References: <20231009130111.518916887@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Alexandra Diupina [ Upstream commit a59addacf899b1b21a7b7449a1c52c98704c2472 ] Process the result of hdlc_open() and call uhdlc_close() in case of an error. It is necessary to pass the error code up the control flow, similar to a possible error in request_irq(). Also add a hdlc_close() call to the uhdlc_close() because the comment to hdlc_close() says it must be called by the hardware driver when the HDLC device is being closed Found by Linux Verification Center (linuxtesting.org) with SVACE. Fixes: c19b6d246a35 ("drivers/net: support hdlc function for QE-UCC") Signed-off-by: Alexandra Diupina Reviewed-by: Christophe Leroy Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/wan/fsl_ucc_hdlc.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/drivers/net/wan/fsl_ucc_hdlc.c b/drivers/net/wan/fsl_ucc_hdlc.c index 5df6e85e7ccb7..c8cff000a931f 100644 --- a/drivers/net/wan/fsl_ucc_hdlc.c +++ b/drivers/net/wan/fsl_ucc_hdlc.c @@ -37,6 +37,8 @@ #define TDM_PPPOHT_SLIC_MAXIN +static int uhdlc_close(struct net_device *dev); + static struct ucc_tdm_info utdm_primary_info = { .uf_info = { .tsa = 0, @@ -661,6 +663,7 @@ static int uhdlc_open(struct net_device *dev) hdlc_device *hdlc = dev_to_hdlc(dev); struct ucc_hdlc_private *priv = hdlc->priv; struct ucc_tdm *utdm = priv->utdm; + int rc = 0; if (priv->hdlc_busy != 1) { if (request_irq(priv->ut_info->uf_info.irq, @@ -683,10 +686,13 @@ static int uhdlc_open(struct net_device *dev) netif_device_attach(priv->ndev); napi_enable(&priv->napi); netif_start_queue(dev); - hdlc_open(dev); + + rc = hdlc_open(dev); + if (rc) + uhdlc_close(dev); } - return 0; + return rc; } static void uhdlc_memclean(struct ucc_hdlc_private *priv) @@ -775,6 +781,8 @@ static int uhdlc_close(struct net_device *dev) netif_stop_queue(dev); priv->hdlc_busy = 0; + hdlc_close(dev); + return 0; } -- 2.40.1