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authorDongdong Deng <dongdong.deng@windriver.com>2009-08-13 19:12:31 +0000
committerDavid S. Miller <davem@davemloft.net>2009-08-14 16:41:16 -0700
commit22580f894ac190c46beebb5c3172e450a2318f79 (patch)
tree01f88df9a5bc27170ef7ca944ba40af578476d72
parent0527a1a8440a20b3d0fd1d0c9e75a6f38a9d5315 (diff)
downloadop-kernel-dev-22580f894ac190c46beebb5c3172e450a2318f79.zip
op-kernel-dev-22580f894ac190c46beebb5c3172e450a2318f79.tar.gz
drivers/net: fixed drivers that support netpoll use ndo_start_xmit()
The NETPOLL API requires that interrupts remain disabled in netpoll_send_skb(). The use of spin_lock_irq() and spin_unlock_irq() in the NETPOLL API callbacks causes the interrupts to get enabled and can lead to kernel instability. The solution is to use spin_lock_irqsave() and spin_unlock_restore() to prevent the irqs from getting enabled while in netpoll_send_skb(). Call trace: netpoll_send_skb() { -> local_irq_save(flags) ---> dev->ndo_start_xmit(skb, dev) ---> spin_lock_irq() ---> spin_unlock_irq() *******here would enable the interrupt. ... -> local_irq_restore(flags) } Signed-off-by: Dongdong Deng <dongdong.deng@windriver.com> Signed-off-by: Jason Wessel <jason.wessel@windriver.com> Acked-by: Bruce Ashfield <bruce.ashfield@windriver.com> Acked-by: Matt Mackall <mpm@selenic.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/b44.c5
-rw-r--r--drivers/net/tulip/tulip_core.c5
-rw-r--r--drivers/net/ucc_geth.c5
-rw-r--r--drivers/net/via-rhine.c5
4 files changed, 12 insertions, 8 deletions
diff --git a/drivers/net/b44.c b/drivers/net/b44.c
index 36d4d37..bafca67 100644
--- a/drivers/net/b44.c
+++ b/drivers/net/b44.c
@@ -952,9 +952,10 @@ static int b44_start_xmit(struct sk_buff *skb, struct net_device *dev)
int rc = NETDEV_TX_OK;
dma_addr_t mapping;
u32 len, entry, ctrl;
+ unsigned long flags;
len = skb->len;
- spin_lock_irq(&bp->lock);
+ spin_lock_irqsave(&bp->lock, flags);
/* This is a hard error, log it. */
if (unlikely(TX_BUFFS_AVAIL(bp) < 1)) {
@@ -1027,7 +1028,7 @@ static int b44_start_xmit(struct sk_buff *skb, struct net_device *dev)
dev->trans_start = jiffies;
out_unlock:
- spin_unlock_irq(&bp->lock);
+ spin_unlock_irqrestore(&bp->lock, flags);
return rc;
diff --git a/drivers/net/tulip/tulip_core.c b/drivers/net/tulip/tulip_core.c
index 99a6364..4cf9a65 100644
--- a/drivers/net/tulip/tulip_core.c
+++ b/drivers/net/tulip/tulip_core.c
@@ -652,8 +652,9 @@ tulip_start_xmit(struct sk_buff *skb, struct net_device *dev)
int entry;
u32 flag;
dma_addr_t mapping;
+ unsigned long flags;
- spin_lock_irq(&tp->lock);
+ spin_lock_irqsave(&tp->lock, flags);
/* Calculate the next Tx descriptor entry. */
entry = tp->cur_tx % TX_RING_SIZE;
@@ -688,7 +689,7 @@ tulip_start_xmit(struct sk_buff *skb, struct net_device *dev)
/* Trigger an immediate transmit demand. */
iowrite32(0, tp->base_addr + CSR1);
- spin_unlock_irq(&tp->lock);
+ spin_unlock_irqrestore(&tp->lock, flags);
dev->trans_start = jiffies;
diff --git a/drivers/net/ucc_geth.c b/drivers/net/ucc_geth.c
index 3b957e6..8a7b8c7 100644
--- a/drivers/net/ucc_geth.c
+++ b/drivers/net/ucc_geth.c
@@ -3111,10 +3111,11 @@ static int ucc_geth_start_xmit(struct sk_buff *skb, struct net_device *dev)
u8 __iomem *bd; /* BD pointer */
u32 bd_status;
u8 txQ = 0;
+ unsigned long flags;
ugeth_vdbg("%s: IN", __func__);
- spin_lock_irq(&ugeth->lock);
+ spin_lock_irqsave(&ugeth->lock, flags);
dev->stats.tx_bytes += skb->len;
@@ -3171,7 +3172,7 @@ static int ucc_geth_start_xmit(struct sk_buff *skb, struct net_device *dev)
uccf = ugeth->uccf;
out_be16(uccf->p_utodr, UCC_FAST_TOD);
#endif
- spin_unlock_irq(&ugeth->lock);
+ spin_unlock_irqrestore(&ugeth->lock, flags);
return 0;
}
diff --git a/drivers/net/via-rhine.c b/drivers/net/via-rhine.c
index 88c30a5..934f767 100644
--- a/drivers/net/via-rhine.c
+++ b/drivers/net/via-rhine.c
@@ -1218,6 +1218,7 @@ static int rhine_start_tx(struct sk_buff *skb, struct net_device *dev)
struct rhine_private *rp = netdev_priv(dev);
void __iomem *ioaddr = rp->base;
unsigned entry;
+ unsigned long flags;
/* Caution: the write order is important here, set the field
with the "ownership" bits last. */
@@ -1261,7 +1262,7 @@ static int rhine_start_tx(struct sk_buff *skb, struct net_device *dev)
cpu_to_le32(TXDESC | (skb->len >= ETH_ZLEN ? skb->len : ETH_ZLEN));
/* lock eth irq */
- spin_lock_irq(&rp->lock);
+ spin_lock_irqsave(&rp->lock, flags);
wmb();
rp->tx_ring[entry].tx_status = cpu_to_le32(DescOwn);
wmb();
@@ -1280,7 +1281,7 @@ static int rhine_start_tx(struct sk_buff *skb, struct net_device *dev)
dev->trans_start = jiffies;
- spin_unlock_irq(&rp->lock);
+ spin_unlock_irqrestore(&rp->lock, flags);
if (debug > 4) {
printk(KERN_DEBUG "%s: Transmit frame #%d queued in slot %d.\n",
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