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sky2: status ring race fix

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The D-Link PCI-X board (and maybe others) can lie about status
ring entries. It seems it will update the register for last status
index before completing the DMA for the ring entry. To avoid reading
stale data, zap the old entry and check.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Stephen Hemminger 2007-11-05 15:52:09 -08:00 committed by Jeff Garzik
parent ac93a3946b
commit ab5adecb2d
1 changed files with 9 additions and 3 deletions
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12
drivers/net/sky2.c
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@ -2247,20 +2247,26 @@ static int sky2_status_intr(struct sky2_hw *hw, int to_do, u16 idx)
do { do {
struct sky2_port *sky2; struct sky2_port *sky2;
struct sky2_status_le *le = hw->st_le + hw->st_idx; struct sky2_status_le *le = hw->st_le + hw->st_idx;
unsigned port = le->css & CSS_LINK_BIT; unsigned port;
struct net_device *dev; struct net_device *dev;
struct sk_buff *skb; struct sk_buff *skb;
u32 status; u32 status;
u16 length; u16 length;
u8 opcode = le->opcode;
if (!(opcode & HW_OWNER))
break;
hw->st_idx = RING_NEXT(hw->st_idx, STATUS_RING_SIZE); hw->st_idx = RING_NEXT(hw->st_idx, STATUS_RING_SIZE);
port = le->css & CSS_LINK_BIT;
dev = hw->dev[port]; dev = hw->dev[port];
sky2 = netdev_priv(dev); sky2 = netdev_priv(dev);
length = le16_to_cpu(le->length); length = le16_to_cpu(le->length);
status = le32_to_cpu(le->status); status = le32_to_cpu(le->status);
switch (le->opcode & ~HW_OWNER) { le->opcode = 0;
switch (opcode & ~HW_OWNER) {
case OP_RXSTAT: case OP_RXSTAT:
++rx[port]; ++rx[port];
skb = sky2_receive(dev, length, status); skb = sky2_receive(dev, length, status);
@ -2353,7 +2359,7 @@ static int sky2_status_intr(struct sky2_hw *hw, int to_do, u16 idx)
default: default:
if (net_ratelimit()) if (net_ratelimit())
printk(KERN_WARNING PFX printk(KERN_WARNING PFX
"unknown status opcode 0x%x\n", le->opcode); "unknown status opcode 0x%x\n", opcode);
} }
} while (hw->st_idx != idx); } while (hw->st_idx != idx);