From: Esben Haabendal <esben@geanix.com>
To: netdev@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, "Andrew Lunn" <andrew@lunn.ch>,
"David S . Miller" <davem@davemloft.net>,
"Michal Simek" <michal.simek@xilinx.com>,
"Petr Štetiar" <ynezz@true.cz>,
stable@vger.kernel.org
Subject: [PATCH 2/8] net: ll_temac: Add more error handling of dma_map_single() calls
Date: Tue, 18 Feb 2020 09:26:31 +0100 [thread overview]
Message-ID: <20200218082631.7204-1-esben@geanix.com> (raw)
This adds error handling to the remaining dma_map_single() calls, so that
behavior is well defined if/when we run out of DMA memory.
Signed-off-by: Esben Haabendal <esben@geanix.com>
Cc: stable@vger.kernel.org
---
drivers/net/ethernet/xilinx/ll_temac_main.c | 26 +++++++++++++++++++--
1 file changed, 24 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/xilinx/ll_temac_main.c b/drivers/net/ethernet/xilinx/ll_temac_main.c
index 996004ef8bd4..c368c3914bda 100644
--- a/drivers/net/ethernet/xilinx/ll_temac_main.c
+++ b/drivers/net/ethernet/xilinx/ll_temac_main.c
@@ -367,6 +367,8 @@ static int temac_dma_bd_init(struct net_device *ndev)
skb_dma_addr = dma_map_single(ndev->dev.parent, skb->data,
XTE_MAX_JUMBO_FRAME_SIZE,
DMA_FROM_DEVICE);
+ if (dma_mapping_error(ndev->dev.parent, skb_dma_addr))
+ goto out;
lp->rx_bd_v[i].phys = cpu_to_be32(skb_dma_addr);
lp->rx_bd_v[i].len = cpu_to_be32(XTE_MAX_JUMBO_FRAME_SIZE);
lp->rx_bd_v[i].app0 = cpu_to_be32(STS_CTRL_APP0_IRQONEND);
@@ -863,12 +865,13 @@ temac_start_xmit(struct sk_buff *skb, struct net_device *ndev)
skb_dma_addr = dma_map_single(ndev->dev.parent, skb->data,
skb_headlen(skb), DMA_TO_DEVICE);
cur_p->len = cpu_to_be32(skb_headlen(skb));
+ if (WARN_ON_ONCE(dma_mapping_error(ndev->dev.parent, skb_dma_addr)))
+ return NETDEV_TX_BUSY;
cur_p->phys = cpu_to_be32(skb_dma_addr);
ptr_to_txbd((void *)skb, cur_p);
for (ii = 0; ii < num_frag; ii++) {
- lp->tx_bd_tail++;
- if (lp->tx_bd_tail >= TX_BD_NUM)
+ if (++lp->tx_bd_tail >= TX_BD_NUM)
lp->tx_bd_tail = 0;
cur_p = &lp->tx_bd_v[lp->tx_bd_tail];
@@ -876,6 +879,25 @@ temac_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, skb_dma_addr)) {
+ if (--lp->tx_bd_tail < 0)
+ lp->tx_bd_tail = TX_BD_NUM - 1;
+ cur_p = &lp->tx_bd_v[lp->tx_bd_tail];
+ while (--ii >= 0) {
+ --frag;
+ dma_unmap_single(ndev->dev.parent,
+ be32_to_cpu(cur_p->phys),
+ skb_frag_size(frag),
+ DMA_TO_DEVICE);
+ if (--lp->tx_bd_tail < 0)
+ lp->tx_bd_tail = TX_BD_NUM - 1;
+ cur_p = &lp->tx_bd_v[lp->tx_bd_tail];
+ }
+ dma_unmap_single(ndev->dev.parent,
+ be32_to_cpu(cur_p->phys),
+ skb_headlen(skb), DMA_TO_DEVICE);
+ return NETDEV_TX_BUSY;
+ }
cur_p->phys = cpu_to_be32(skb_dma_addr);
cur_p->len = cpu_to_be32(skb_frag_size(frag));
cur_p->app0 = 0;
--
2.25.0
reply other threads:[~2020-02-18 8:26 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
Reply instructions:
You may reply publicly 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=20200218082631.7204-1-esben@geanix.com \
--to=esben@geanix.com \
--cc=andrew@lunn.ch \
--cc=davem@davemloft.net \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=michal.simek@xilinx.com \
--cc=netdev@vger.kernel.org \
--cc=stable@vger.kernel.org \
--cc=ynezz@true.cz \
/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
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).