diff mbox

[net-2.6,2/2] e1000: fix transmit routine exit bug

Message ID 20090417025946.19671.21412.stgit@localhost.localdomain
State Accepted, archived
Delegated to: David Miller
Headers show

Commit Message

Kirsher, Jeffrey T April 17, 2009, 2:59 a.m. UTC 
From: Jesse Brandeburg <jesse.brandeburg@intel.com>

If the e1000 transmit cleanup inner loop exited early, then
cleaned might not be true.  This could cause tx hangs or other
badness.  Use count to track the total number of descriptors
cleaned instead of basing a tx queue restart off of a temporary
working state variable.

This code now makes the flow the same for e1000/e1000e/igb/ixgbe

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---

 drivers/net/e1000/e1000_main.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)


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Comments

David Miller April 17, 2009, 8:10 a.m. UTC | #1 
From: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Date: Thu, 16 Apr 2009 19:59:47 -0700

> If the e1000 transmit cleanup inner loop exited early, then
> cleaned might not be true.  This could cause tx hangs or other
> badness.  Use count to track the total number of descriptors
> cleaned instead of basing a tx queue restart off of a temporary
> working state variable.
> 
> This code now makes the flow the same for e1000/e1000e/igb/ixgbe
> 
> Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

Applied.
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diff mbox

Patch

diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
index ef12931..6a46cee 100644
--- a/drivers/net/e1000/e1000_main.c
+++ b/drivers/net/e1000/e1000_main.c
@@ -3834,7 +3834,6 @@  static bool e1000_clean_tx_irq(struct e1000_adapter *adapter,
 	struct e1000_buffer *buffer_info;
 	unsigned int i, eop;
 	unsigned int count = 0;
-	bool cleaned = false;
 	unsigned int total_tx_bytes=0, total_tx_packets=0;
 
 	i = tx_ring->next_to_clean;
@@ -3843,7 +3842,8 @@  static bool e1000_clean_tx_irq(struct e1000_adapter *adapter,
 
 	while ((eop_desc->upper.data & cpu_to_le32(E1000_TXD_STAT_DD)) &&
 	       (count < tx_ring->count)) {
-		for (cleaned = false; !cleaned; count++) {
+		bool cleaned = false;
+		for ( ; !cleaned; count++) {
 			tx_desc = E1000_TX_DESC(*tx_ring, i);
 			buffer_info = &tx_ring->buffer_info[i];
 			cleaned = (i == eop);
@@ -3871,7 +3871,7 @@  static bool e1000_clean_tx_irq(struct e1000_adapter *adapter,
 	tx_ring->next_to_clean = i;
 
 #define TX_WAKE_THRESHOLD 32
-	if (unlikely(cleaned && netif_carrier_ok(netdev) &&
+	if (unlikely(count && netif_carrier_ok(netdev) &&
 		     E1000_DESC_UNUSED(tx_ring) >= TX_WAKE_THRESHOLD)) {
 		/* Make sure that anybody stopping the queue after this
 		 * sees the new next_to_clean.