This is a note to let you know that I've just added the patch titled
net: arc: fix the device for dma_map_single/dma_unmap_single
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-arc-fix-the-device-for-dma_map_single-dma_unmap_.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 3e5fe18933ed09f2d368f6c7bfaf76f322414cbf
Author: Johan Jonker <jbx6244@xxxxxxxxx>
Date: Mon Nov 4 21:01:38 2024 +0800
net: arc: fix the device for dma_map_single/dma_unmap_single
[ Upstream commit 71803c1dfa29e0d13b99e48fda11107cc8caebc7 ]
The ndev->dev and pdev->dev aren't the same device, use ndev->dev.parent
which has dma_mask, ndev->dev.parent is just pdev->dev.
Or it would cause the following issue:
[ 39.933526] ------------[ cut here ]------------
[ 39.938414] WARNING: CPU: 1 PID: 501 at kernel/dma/mapping.c:149 dma_map_page_attrs+0x90/0x1f8
Fixes: f959dcd6ddfd ("dma-direct: Fix potential NULL pointer dereference")
Signed-off-by: David Wu <david.wu@xxxxxxxxxxxxxx>
Signed-off-by: Johan Jonker <jbx6244@xxxxxxxxx>
Signed-off-by: Andy Yan <andy.yan@xxxxxxxxxxxxxx>
Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/ethernet/arc/emac_main.c b/drivers/net/ethernet/arc/emac_main.c
index b56a9e2aecd93..61d076e09571c 100644
--- a/drivers/net/ethernet/arc/emac_main.c
+++ b/drivers/net/ethernet/arc/emac_main.c
@@ -111,6 +111,7 @@ static void arc_emac_tx_clean(struct net_device *ndev)
{
struct arc_emac_priv *priv = netdev_priv(ndev);
struct net_device_stats *stats = &ndev->stats;
+ struct device *dev = ndev->dev.parent;
unsigned int i;
for (i = 0; i < TX_BD_NUM; i++) {
@@ -140,7 +141,7 @@ static void arc_emac_tx_clean(struct net_device *ndev)
stats->tx_bytes += skb->len;
}
- dma_unmap_single(&ndev->dev, dma_unmap_addr(tx_buff, addr),
+ dma_unmap_single(dev, dma_unmap_addr(tx_buff, addr),
dma_unmap_len(tx_buff, len), DMA_TO_DEVICE);
/* return the sk_buff to system */
@@ -174,6 +175,7 @@ static void arc_emac_tx_clean(struct net_device *ndev)
static int arc_emac_rx(struct net_device *ndev, int budget)
{
struct arc_emac_priv *priv = netdev_priv(ndev);
+ struct device *dev = ndev->dev.parent;
unsigned int work_done;
for (work_done = 0; work_done < budget; work_done++) {
@@ -223,9 +225,9 @@ static int arc_emac_rx(struct net_device *ndev, int budget)
continue;
}
- addr = dma_map_single(&ndev->dev, (void *)skb->data,
+ addr = dma_map_single(dev, (void *)skb->data,
EMAC_BUFFER_SIZE, DMA_FROM_DEVICE);
- if (dma_mapping_error(&ndev->dev, addr)) {
+ if (dma_mapping_error(dev, addr)) {
if (net_ratelimit())
netdev_err(ndev, "cannot map dma buffer\n");
dev_kfree_skb(skb);
@@ -237,7 +239,7 @@ static int arc_emac_rx(struct net_device *ndev, int budget)
}
/* unmap previosly mapped skb */
- dma_unmap_single(&ndev->dev, dma_unmap_addr(rx_buff, addr),
+ dma_unmap_single(dev, dma_unmap_addr(rx_buff, addr),
dma_unmap_len(rx_buff, len), DMA_FROM_DEVICE);
pktlen = info & LEN_MASK;
@@ -423,6 +425,7 @@ static int arc_emac_open(struct net_device *ndev)
{
struct arc_emac_priv *priv = netdev_priv(ndev);
struct phy_device *phy_dev = ndev->phydev;
+ struct device *dev = ndev->dev.parent;
int i;
phy_dev->autoneg = AUTONEG_ENABLE;
@@ -445,9 +448,9 @@ static int arc_emac_open(struct net_device *ndev)
if (unlikely(!rx_buff->skb))
return -ENOMEM;
- addr = dma_map_single(&ndev->dev, (void *)rx_buff->skb->data,
+ addr = dma_map_single(dev, (void *)rx_buff->skb->data,
EMAC_BUFFER_SIZE, DMA_FROM_DEVICE);
- if (dma_mapping_error(&ndev->dev, addr)) {
+ if (dma_mapping_error(dev, addr)) {
netdev_err(ndev, "cannot dma map\n");
dev_kfree_skb(rx_buff->skb);
return -ENOMEM;
@@ -548,6 +551,7 @@ static void arc_emac_set_rx_mode(struct net_device *ndev)
static void arc_free_tx_queue(struct net_device *ndev)
{
struct arc_emac_priv *priv = netdev_priv(ndev);
+ struct device *dev = ndev->dev.parent;
unsigned int i;
for (i = 0; i < TX_BD_NUM; i++) {
@@ -555,7 +559,7 @@ static void arc_free_tx_queue(struct net_device *ndev)
struct buffer_state *tx_buff = &priv->tx_buff[i];
if (tx_buff->skb) {
- dma_unmap_single(&ndev->dev,
+ dma_unmap_single(dev,
dma_unmap_addr(tx_buff, addr),
dma_unmap_len(tx_buff, len),
DMA_TO_DEVICE);
@@ -579,6 +583,7 @@ static void arc_free_tx_queue(struct net_device *ndev)
static void arc_free_rx_queue(struct net_device *ndev)
{
struct arc_emac_priv *priv = netdev_priv(ndev);
+ struct device *dev = ndev->dev.parent;
unsigned int i;
for (i = 0; i < RX_BD_NUM; i++) {
@@ -586,7 +591,7 @@ static void arc_free_rx_queue(struct net_device *ndev)
struct buffer_state *rx_buff = &priv->rx_buff[i];
if (rx_buff->skb) {
- dma_unmap_single(&ndev->dev,
+ dma_unmap_single(dev,
dma_unmap_addr(rx_buff, addr),
dma_unmap_len(rx_buff, len),
DMA_FROM_DEVICE);
@@ -679,6 +684,7 @@ static netdev_tx_t arc_emac_tx(struct sk_buff *skb, struct net_device *ndev)
unsigned int len, *txbd_curr = &priv->txbd_curr;
struct net_device_stats *stats = &ndev->stats;
__le32 *info = &priv->txbd[*txbd_curr].info;
+ struct device *dev = ndev->dev.parent;
dma_addr_t addr;
if (skb_padto(skb, ETH_ZLEN))
@@ -692,10 +698,9 @@ static netdev_tx_t arc_emac_tx(struct sk_buff *skb, struct net_device *ndev)
return NETDEV_TX_BUSY;
}
- addr = dma_map_single(&ndev->dev, (void *)skb->data, len,
- DMA_TO_DEVICE);
+ addr = dma_map_single(dev, (void *)skb->data, len, DMA_TO_DEVICE);
- if (unlikely(dma_mapping_error(&ndev->dev, addr))) {
+ if (unlikely(dma_mapping_error(dev, addr))) {
stats->tx_dropped++;
stats->tx_errors++;
dev_kfree_skb_any(skb);
