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authorJesse Brandeburg <jesse.brandeburg@intel.com>2009-09-25 12:18:07 +0000
committerDavid S. Miller <davem@davemloft.net>2009-09-26 20:15:42 -0700
commitcdd7549e27bf5e8abc4e19d5e8d110b8252b4fe4 (patch)
tree20682463abca2954c6a50ec1ac77971e989becc3 /drivers/net/e1000
parentbe0f071956e2142e2e88e9d6d5655ba1c75d07c8 (diff)
e1000: fix tx waking queue after queue stopped during shutdown
This fix closes a race where the adapter can be shutting down while hard_start_xmit is being called and interrupts are being handled. Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com> Signed-off-by: Don Skidmore <donald.c.skidmore@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/e1000')
-rw-r--r--drivers/net/e1000/e1000_main.c15
1 files changed, 9 insertions, 6 deletions
diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
index 11508afdfdb..8c64363faaf 100644
--- a/drivers/net/e1000/e1000_main.c
+++ b/drivers/net/e1000/e1000_main.c
@@ -2733,8 +2733,9 @@ static int e1000_tx_map(struct e1000_adapter *adapter,
size -= 4;
buffer_info->length = size;
- buffer_info->dma = skb_shinfo(skb)->dma_head + offset;
+ /* set time_stamp *before* dma to help avoid a possible race */
buffer_info->time_stamp = jiffies;
+ buffer_info->dma = skb_shinfo(skb)->dma_head + offset;
buffer_info->next_to_watch = i;
len -= size;
@@ -2774,8 +2775,8 @@ static int e1000_tx_map(struct e1000_adapter *adapter,
size -= 4;
buffer_info->length = size;
- buffer_info->dma = map[f] + offset;
buffer_info->time_stamp = jiffies;
+ buffer_info->dma = map[f] + offset;
buffer_info->next_to_watch = i;
len -= size;
@@ -3459,7 +3460,9 @@ static bool e1000_clean_tx_irq(struct e1000_adapter *adapter,
* sees the new next_to_clean.
*/
smp_mb();
- if (netif_queue_stopped(netdev)) {
+
+ if (netif_queue_stopped(netdev) &&
+ !(test_bit(__E1000_DOWN, &adapter->flags))) {
netif_wake_queue(netdev);
++adapter->restart_queue;
}
@@ -3469,8 +3472,8 @@ static bool e1000_clean_tx_irq(struct e1000_adapter *adapter,
/* Detect a transmit hang in hardware, this serializes the
* check with the clearing of time_stamp and movement of i */
adapter->detect_tx_hung = false;
- if (tx_ring->buffer_info[i].time_stamp &&
- time_after(jiffies, tx_ring->buffer_info[i].time_stamp +
+ if (tx_ring->buffer_info[eop].time_stamp &&
+ time_after(jiffies, tx_ring->buffer_info[eop].time_stamp +
(adapter->tx_timeout_factor * HZ))
&& !(er32(STATUS) & E1000_STATUS_TXOFF)) {
@@ -3492,7 +3495,7 @@ static bool e1000_clean_tx_irq(struct e1000_adapter *adapter,
readl(hw->hw_addr + tx_ring->tdt),
tx_ring->next_to_use,
tx_ring->next_to_clean,
- tx_ring->buffer_info[i].time_stamp,
+ tx_ring->buffer_info[eop].time_stamp,
eop,
jiffies,
eop_desc->upper.fields.status);