Gitweb: http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=ab5adecb2d02f3688719dfb5936a82833fcc3955 Commit: ab5adecb2d02f3688719dfb5936a82833fcc3955 Parent: ac93a3946b676025fa55356180e8321639744b31 Author: Stephen Hemminger <[EMAIL PROTECTED]> AuthorDate: Mon Nov 5 15:52:09 2007 -0800 Committer: Jeff Garzik <[EMAIL PROTECTED]> CommitDate: Sat Nov 10 04:25:08 2007 -0500
sky2: status ring race fix 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 <[EMAIL PROTECTED]> Signed-off-by: Jeff Garzik <[EMAIL PROTECTED]> --- drivers/net/sky2.c | 12 +++++++++--- 1 files changed, 9 insertions(+), 3 deletions(-) diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c index 4f41a94..706884a 100644 --- a/drivers/net/sky2.c +++ b/drivers/net/sky2.c @@ -2247,20 +2247,26 @@ static int sky2_status_intr(struct sky2_hw *hw, int to_do, u16 idx) do { struct sky2_port *sky2; 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 sk_buff *skb; u32 status; u16 length; + u8 opcode = le->opcode; + + if (!(opcode & HW_OWNER)) + break; hw->st_idx = RING_NEXT(hw->st_idx, STATUS_RING_SIZE); + port = le->css & CSS_LINK_BIT; dev = hw->dev[port]; sky2 = netdev_priv(dev); length = le16_to_cpu(le->length); status = le32_to_cpu(le->status); - switch (le->opcode & ~HW_OWNER) { + le->opcode = 0; + switch (opcode & ~HW_OWNER) { case OP_RXSTAT: ++rx[port]; 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: if (net_ratelimit()) printk(KERN_WARNING PFX - "unknown status opcode 0x%x\n", le->opcode); + "unknown status opcode 0x%x\n", opcode); } } while (hw->st_idx != idx); - To unsubscribe from this list: send the line "unsubscribe git-commits-head" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html