From mboxrd@z Thu Jan 1 00:00:00 1970 From: Srinivas Neeli Subject: [PATCH 2/2] can: xilinx_can: Fix usage of skb memory Date: Wed, 20 Nov 2019 17:41:05 +0530 Message-ID: <1574251865-19592-3-git-send-email-srinivas.neeli@xilinx.com> References: <1574251865-19592-1-git-send-email-srinivas.neeli@xilinx.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: In-Reply-To: <1574251865-19592-1-git-send-email-srinivas.neeli@xilinx.com> Sender: linux-kernel-owner@vger.kernel.org To: wg@grandegger.com, mkl@pengutronix.de, davem@davemloft.net, michal.simek@xilinx.com, appanad@xilinx.com Cc: linux-can@vger.kernel.org, netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, git@xilinx.com, nagasure@xilinx.com, Srinivas Neeli List-Id: linux-can.vger.kernel.org As per linux can framework, driver not allowed to touch the skb memory after can_put_echo_skb() call. This patch fixes the same. https://www.spinics.net/lists/linux-can/msg02199.html Signed-off-by: Srinivas Neeli Signed-off-by: Michal Simek --- drivers/net/can/xilinx_can.c | 21 +++++++++++++++------ 1 file changed, 15 insertions(+), 6 deletions(-) diff --git a/drivers/net/can/xilinx_can.c b/drivers/net/can/xilinx_can.c index c5f05b994435..536b0f8272f6 100644 --- a/drivers/net/can/xilinx_can.c +++ b/drivers/net/can/xilinx_can.c @@ -191,6 +191,8 @@ struct xcan_devtype_data { * @bus_clk: Pointer to struct clk * @can_clk: Pointer to struct clk * @devtype: Device type specific constants + * @cfd: Variable to struct canfd_frame + * @is_canfd: For checking canfd or not */ struct xcan_priv { struct can_priv can; @@ -208,6 +210,8 @@ struct xcan_priv { struct clk *bus_clk; struct clk *can_clk; struct xcan_devtype_data devtype; + struct canfd_frame cfd; + bool is_canfd; }; /* CAN Bittiming constants as per Xilinx CAN specs */ @@ -543,14 +547,13 @@ static int xcan_do_set_mode(struct net_device *ndev, enum can_mode mode) /** * xcan_write_frame - Write a frame to HW * @priv: Driver private data structure - * @skb: sk_buff pointer that contains data to be Txed + * @cf: canfd_frame pointer that contains data to be Txed * @frame_offset: Register offset to write the frame to */ -static void xcan_write_frame(struct xcan_priv *priv, struct sk_buff *skb, +static void xcan_write_frame(struct xcan_priv *priv, struct canfd_frame *cf, int frame_offset) { u32 id, dlc, data[2] = {0, 0}; - struct canfd_frame *cf = (struct canfd_frame *)skb->data; u32 ramoff, dwindex = 0, i; /* Watch carefully on the bit sequence */ @@ -581,7 +584,7 @@ static void xcan_write_frame(struct xcan_priv *priv, struct sk_buff *skb, } dlc = can_len2dlc(cf->len) << XCAN_DLCR_DLC_SHIFT; - if (can_is_canfd_skb(skb)) { + if (priv->is_canfd) { if (cf->flags & CANFD_BRS) dlc |= XCAN_DLCR_BRS_MASK; dlc |= XCAN_DLCR_EDL_MASK; @@ -633,6 +636,9 @@ static int xcan_start_xmit_fifo(struct sk_buff *skb, struct net_device *ndev) struct xcan_priv *priv = netdev_priv(ndev); unsigned long flags; + priv->cfd = *((struct canfd_frame *)skb->data); + priv->is_canfd = can_is_canfd_skb(skb); + /* Check if the TX buffer is full */ if (unlikely(priv->read_reg(priv, XCAN_SR_OFFSET) & XCAN_SR_TXFLL_MASK)) @@ -644,7 +650,7 @@ static int xcan_start_xmit_fifo(struct sk_buff *skb, struct net_device *ndev) priv->tx_head++; - xcan_write_frame(priv, skb, XCAN_TXFIFO_OFFSET); + xcan_write_frame(priv, &priv->cfd, XCAN_TXFIFO_OFFSET); /* Clear TX-FIFO-empty interrupt for xcan_tx_interrupt() */ if (priv->tx_max > 1) @@ -671,6 +677,9 @@ static int xcan_start_xmit_mailbox(struct sk_buff *skb, struct net_device *ndev) struct xcan_priv *priv = netdev_priv(ndev); unsigned long flags; + priv->cfd = *((struct canfd_frame *)skb->data); + priv->is_canfd = can_is_canfd_skb(skb); + if (unlikely(priv->read_reg(priv, XCAN_TRR_OFFSET) & BIT(XCAN_TX_MAILBOX_IDX))) return -ENOSPC; @@ -681,7 +690,7 @@ static int xcan_start_xmit_mailbox(struct sk_buff *skb, struct net_device *ndev) priv->tx_head++; - xcan_write_frame(priv, skb, + xcan_write_frame(priv, &priv->cfd, XCAN_TXMSG_FRAME_OFFSET(XCAN_TX_MAILBOX_IDX)); /* Mark buffer as ready for transmit */ -- 2.7.4 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 X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3A86DC432C0 for ; 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Ip=[149.199.60.83]; Helo=[xsj-pvapsmtpgw01] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR02MB5944 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191120_041159_970732_B11E59B9 X-CRM114-Status: GOOD ( 13.16 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Srinivas Neeli , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-can@vger.kernel.org, nagasure@xilinx.com, git@xilinx.com, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org As per linux can framework, driver not allowed to touch the skb memory after can_put_echo_skb() call. This patch fixes the same. https://www.spinics.net/lists/linux-can/msg02199.html Signed-off-by: Srinivas Neeli Signed-off-by: Michal Simek --- drivers/net/can/xilinx_can.c | 21 +++++++++++++++------ 1 file changed, 15 insertions(+), 6 deletions(-) diff --git a/drivers/net/can/xilinx_can.c b/drivers/net/can/xilinx_can.c index c5f05b994435..536b0f8272f6 100644 --- a/drivers/net/can/xilinx_can.c +++ b/drivers/net/can/xilinx_can.c @@ -191,6 +191,8 @@ struct xcan_devtype_data { * @bus_clk: Pointer to struct clk * @can_clk: Pointer to struct clk * @devtype: Device type specific constants + * @cfd: Variable to struct canfd_frame + * @is_canfd: For checking canfd or not */ struct xcan_priv { struct can_priv can; @@ -208,6 +210,8 @@ struct xcan_priv { struct clk *bus_clk; struct clk *can_clk; struct xcan_devtype_data devtype; + struct canfd_frame cfd; + bool is_canfd; }; /* CAN Bittiming constants as per Xilinx CAN specs */ @@ -543,14 +547,13 @@ static int xcan_do_set_mode(struct net_device *ndev, enum can_mode mode) /** * xcan_write_frame - Write a frame to HW * @priv: Driver private data structure - * @skb: sk_buff pointer that contains data to be Txed + * @cf: canfd_frame pointer that contains data to be Txed * @frame_offset: Register offset to write the frame to */ -static void xcan_write_frame(struct xcan_priv *priv, struct sk_buff *skb, +static void xcan_write_frame(struct xcan_priv *priv, struct canfd_frame *cf, int frame_offset) { u32 id, dlc, data[2] = {0, 0}; - struct canfd_frame *cf = (struct canfd_frame *)skb->data; u32 ramoff, dwindex = 0, i; /* Watch carefully on the bit sequence */ @@ -581,7 +584,7 @@ static void xcan_write_frame(struct xcan_priv *priv, struct sk_buff *skb, } dlc = can_len2dlc(cf->len) << XCAN_DLCR_DLC_SHIFT; - if (can_is_canfd_skb(skb)) { + if (priv->is_canfd) { if (cf->flags & CANFD_BRS) dlc |= XCAN_DLCR_BRS_MASK; dlc |= XCAN_DLCR_EDL_MASK; @@ -633,6 +636,9 @@ static int xcan_start_xmit_fifo(struct sk_buff *skb, struct net_device *ndev) struct xcan_priv *priv = netdev_priv(ndev); unsigned long flags; + priv->cfd = *((struct canfd_frame *)skb->data); + priv->is_canfd = can_is_canfd_skb(skb); + /* Check if the TX buffer is full */ if (unlikely(priv->read_reg(priv, XCAN_SR_OFFSET) & XCAN_SR_TXFLL_MASK)) @@ -644,7 +650,7 @@ static int xcan_start_xmit_fifo(struct sk_buff *skb, struct net_device *ndev) priv->tx_head++; - xcan_write_frame(priv, skb, XCAN_TXFIFO_OFFSET); + xcan_write_frame(priv, &priv->cfd, XCAN_TXFIFO_OFFSET); /* Clear TX-FIFO-empty interrupt for xcan_tx_interrupt() */ if (priv->tx_max > 1) @@ -671,6 +677,9 @@ static int xcan_start_xmit_mailbox(struct sk_buff *skb, struct net_device *ndev) struct xcan_priv *priv = netdev_priv(ndev); unsigned long flags; + priv->cfd = *((struct canfd_frame *)skb->data); + priv->is_canfd = can_is_canfd_skb(skb); + if (unlikely(priv->read_reg(priv, XCAN_TRR_OFFSET) & BIT(XCAN_TX_MAILBOX_IDX))) return -ENOSPC; @@ -681,7 +690,7 @@ static int xcan_start_xmit_mailbox(struct sk_buff *skb, struct net_device *ndev) priv->tx_head++; - xcan_write_frame(priv, skb, + xcan_write_frame(priv, &priv->cfd, XCAN_TXMSG_FRAME_OFFSET(XCAN_TX_MAILBOX_IDX)); /* Mark buffer as ready for transmit */ -- 2.7.4 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel