Netdev Archive on lore.kernel.org
 help / color / Atom feed
From: Andre Przywara <andre.przywara@arm.com>
To: "David S . Miller" <davem@davemloft.net>,
	Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Cc: Michal Simek <michal.simek@xilinx.com>,
	Robert Hancock <hancock@sedsystems.ca>,
	netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH 06/14] net: axienet: Check for DMA mapping errors
Date: Fri, 10 Jan 2020 11:54:07 +0000
Message-ID: <20200110115415.75683-7-andre.przywara@arm.com> (raw)
In-Reply-To: <20200110115415.75683-1-andre.przywara@arm.com>

Especially with the default 32-bit DMA mask, DMA buffers are a limited
resource, so their allocation can fail.
So as the DMA API documentation requires, add error checking code after
dma_map_single() calls to catch the case where we run out of "low" memory.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
---
 .../net/ethernet/xilinx/xilinx_axienet_main.c | 22 ++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
index 82abe2b0f16a..8d2b67cbecf9 100644
--- a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
+++ b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
@@ -248,6 +248,11 @@ static int axienet_dma_bd_init(struct net_device *ndev)
 						     skb->data,
 						     lp->max_frm_size,
 						     DMA_FROM_DEVICE);
+		if (dma_mapping_error(ndev->dev.parent, lp->rx_bd_v[i].phys)) {
+			dev_kfree_skb(skb);
+			goto out;
+		}
+
 		lp->rx_bd_v[i].cntrl = lp->max_frm_size;
 	}
 
@@ -668,6 +673,7 @@ axienet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
 	dma_addr_t tail_p;
 	struct axienet_local *lp = netdev_priv(ndev);
 	struct axidma_bd *cur_p;
+	u32 orig_tail_ptr = lp->tx_bd_tail;
 
 	num_frag = skb_shinfo(skb)->nr_frags;
 	cur_p = &lp->tx_bd_v[lp->tx_bd_tail];
@@ -703,9 +709,11 @@ axienet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
 		cur_p->app0 |= 2; /* Tx Full Checksum Offload Enabled */
 	}
 
-	cur_p->cntrl = skb_headlen(skb) | XAXIDMA_BD_CTRL_TXSOF_MASK;
 	cur_p->phys = dma_map_single(ndev->dev.parent, skb->data,
 				     skb_headlen(skb), DMA_TO_DEVICE);
+	if (dma_mapping_error(ndev->dev.parent, cur_p->phys))
+		return NETDEV_TX_BUSY;
+	cur_p->cntrl = skb_headlen(skb) | XAXIDMA_BD_CTRL_TXSOF_MASK;
 
 	for (ii = 0; ii < num_frag; ii++) {
 		if (++lp->tx_bd_tail >= lp->tx_bd_num)
@@ -716,6 +724,13 @@ axienet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
 					     skb_frag_address(frag),
 					     skb_frag_size(frag),
 					     DMA_TO_DEVICE);
+		if (dma_mapping_error(ndev->dev.parent, cur_p->phys)) {
+			axienet_free_tx_chain(ndev, orig_tail_ptr, ii + 1,
+					      NULL);
+			lp->tx_bd_tail = orig_tail_ptr;
+
+			return NETDEV_TX_BUSY;
+		}
 		cur_p->cntrl = skb_frag_size(frag);
 	}
 
@@ -796,6 +811,11 @@ static void axienet_recv(struct net_device *ndev)
 		cur_p->phys = dma_map_single(ndev->dev.parent, new_skb->data,
 					     lp->max_frm_size,
 					     DMA_FROM_DEVICE);
+		if (dma_mapping_error(ndev->dev.parent, cur_p->phys)) {
+			dev_kfree_skb(new_skb);
+			return;
+		}
+
 		cur_p->cntrl = lp->max_frm_size;
 		cur_p->status = 0;
 		cur_p->skb = new_skb;
-- 
2.17.1


  parent reply index

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-10 11:54 [PATCH 00/14] net: axienet: Error handling, SGMII and 64-bit DMA fixes Andre Przywara
2020-01-10 11:54 ` [PATCH 01/14] net: xilinx: temac: Relax Kconfig dependencies Andre Przywara
2020-01-10 14:19   ` Radhey Shyam Pandey
2020-01-10 11:54 ` [PATCH 02/14] net: axienet: Propagate failure of DMA descriptor setup Andre Przywara
2020-01-10 14:54   ` Radhey Shyam Pandey
2020-01-10 17:53     ` Radhey Shyam Pandey
2020-01-10 11:54 ` [PATCH 03/14] net: axienet: Fix DMA descriptor cleanup path Andre Przywara
2020-01-10 15:14   ` Radhey Shyam Pandey
2020-01-10 15:43     ` Andre Przywara
2020-01-10 17:05       ` Radhey Shyam Pandey
2020-01-16 18:03         ` Andre Przywara
2020-01-20 18:32           ` Radhey Shyam Pandey
2020-01-10 11:54 ` [PATCH 04/14] net: axienet: Improve DMA error handling Andre Przywara
2020-01-10 15:26   ` Radhey Shyam Pandey
2020-01-10 11:54 ` [PATCH 05/14] net: axienet: Factor out TX descriptor chain cleanup Andre Przywara
2020-01-10 18:04   ` Radhey Shyam Pandey
2020-01-10 11:54 ` Andre Przywara [this message]
2020-01-13  5:54   ` [PATCH 06/14] net: axienet: Check for DMA mapping errors Radhey Shyam Pandey
2020-01-10 11:54 ` [PATCH 07/14] net: axienet: Fix SGMII support Andre Przywara
2020-01-10 14:04   ` Andrew Lunn
2020-01-10 14:20     ` Andre Przywara
2020-01-10 14:26       ` Andrew Lunn
2020-01-10 15:04       ` Russell King - ARM Linux admin
2020-01-10 15:22         ` Russell King - ARM Linux admin
2020-01-10 17:04           ` Russell King - ARM Linux admin
2020-01-18 11:22             ` Russell King - ARM Linux admin
2020-01-20 14:50               ` Andre Przywara
2020-01-20 15:45                 ` Russell King - ARM Linux admin
2020-01-27 17:04                   ` Andre Przywara
2020-01-27 17:20                     ` Radhey Shyam Pandey
2020-01-27 18:53                     ` Russell King - ARM Linux admin
2020-01-10 14:58   ` Russell King - ARM Linux admin
2020-01-10 17:32     ` Andre Przywara
2020-01-10 18:05       ` Russell King - ARM Linux admin
2020-01-10 19:33         ` Andrew Lunn
2020-01-10 11:54 ` [PATCH 08/14] net: axienet: Drop MDIO interrupt registers from ethtools dump Andre Przywara
2020-01-13  6:02   ` Radhey Shyam Pandey
2020-01-10 11:54 ` [PATCH 09/14] net: axienet: Add mii-tool support Andre Przywara
2020-01-13  6:12   ` Radhey Shyam Pandey
2020-01-10 11:54 ` [PATCH 10/14] net: axienet: Wrap DMA pointer writes to prepare for 64 bit Andre Przywara
2020-01-10 11:54 ` [PATCH 11/14] net: axienet: Upgrade descriptors to hold 64-bit addresses Andre Przywara
2020-01-14 16:35   ` Radhey Shyam Pandey
2020-01-14 17:29     ` Andre Przywara
2020-01-10 11:54 ` [PATCH 12/14] net: axienet: Autodetect 64-bit DMA capability Andre Przywara
2020-01-10 14:08   ` Andrew Lunn
2020-01-10 14:13     ` Andre Przywara
2020-01-10 14:22       ` Andrew Lunn
2020-01-10 15:08         ` Andre Przywara
2020-01-10 15:22           ` Andrew Lunn
2020-01-14 17:03   ` Radhey Shyam Pandey
2020-01-14 17:41     ` Andre Przywara
2020-01-15  6:02       ` Radhey Shyam Pandey
2020-01-10 11:54 ` [PATCH 13/14] net: axienet: Allow DMA to beyond 4GB Andre Przywara
2020-01-10 11:54 ` [PATCH 14/14] net: axienet: Update devicetree binding documentation Andre Przywara
2020-01-21 21:51   ` Rob Herring
2020-01-24 16:29     ` Andre Przywara
2020-01-27  9:28       ` Radhey Shyam Pandey

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200110115415.75683-7-andre.przywara@arm.com \
    --to=andre.przywara@arm.com \
    --cc=davem@davemloft.net \
    --cc=hancock@sedsystems.ca \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=michal.simek@xilinx.com \
    --cc=netdev@vger.kernel.org \
    --cc=radhey.shyam.pandey@xilinx.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Netdev Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/netdev/0 netdev/git/0.git
	git clone --mirror https://lore.kernel.org/netdev/1 netdev/git/1.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 netdev netdev/ https://lore.kernel.org/netdev \
		netdev@vger.kernel.org
	public-inbox-index netdev

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.netdev


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git