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Date: Fri, 30 Nov 2007 17:56:44 +0100
From: Robert Olsson <Robert.Olsson@...a.slu.se>
To: "Kok, Auke" <auke-jan.h.kok@...el.com>
Cc: Stephen Hemminger <shemminger@...ux-foundation.org>,
Robert Olsson <Robert.Olsson@...a.slu.se>,
David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: net_rx_action/NAPI oops [PATCH]
Hello!
After further investigations. The bug was just in front of us...
ifconfig down in combination with the test for || !netif_running() can
return a full quota and netif_rx_complete() done which causes the oops
in net_rx_action. Of course the load must be high enough to fill the
quota.
I've found a bunch of drivers having this bug.
Cheers.
--ro
Signed-off-by: Robert Olsson <robert.olsson@....uu.se>
diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
index cf39473..f4137ad 100644
--- a/drivers/net/e1000/e1000_main.c
+++ b/drivers/net/e1000/e1000_main.c
@@ -3947,6 +3947,10 @@ e1000_clean(struct napi_struct *napi, int budget)
quit_polling:
if (likely(adapter->itr_setting & 3))
e1000_set_itr(adapter);
+
+ if(work_done == budget)
+ work_done--;
+
netif_rx_complete(poll_dev, napi);
e1000_irq_enable(adapter);
}
diff --git a/drivers/net/e1000e/netdev.c b/drivers/net/e1000e/netdev.c
index 4fd2e23..e43b5ca 100644
--- a/drivers/net/e1000e/netdev.c
+++ b/drivers/net/e1000e/netdev.c
@@ -1408,6 +1408,9 @@ static int e1000_clean(struct napi_struct *napi, int budget)
if ((!tx_cleaned && (work_done < budget)) ||
!netif_running(poll_dev)) {
quit_polling:
+ if(work_done == budget)
+ work_done--;
+
if (adapter->itr_setting & 3)
e1000_set_itr(adapter);
netif_rx_complete(poll_dev, napi);
diff --git a/drivers/net/ixgb/ixgb_main.c b/drivers/net/ixgb/ixgb_main.c
index 3021234..e3064ef 100644
--- a/drivers/net/ixgb/ixgb_main.c
+++ b/drivers/net/ixgb/ixgb_main.c
@@ -1783,6 +1783,10 @@ ixgb_clean(struct napi_struct *napi, int budget)
/* if no Tx and not enough Rx work done, exit the polling mode */
if((!tx_cleaned && (work_done == 0)) || !netif_running(netdev)) {
+
+ if(work_done == budget)
+ work_done--;
+
netif_rx_complete(netdev, napi);
ixgb_irq_enable(adapter);
}
diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c
index 00bc525..204f5fa 100644
--- a/drivers/net/ixgbe/ixgbe_main.c
+++ b/drivers/net/ixgbe/ixgbe_main.c
@@ -579,6 +579,9 @@ static int ixgbe_clean_rxonly(struct napi_struct *napi, int budget)
/* If no Tx and not enough Rx work done, exit the polling mode */
if ((work_done < budget) || !netif_running(netdev)) {
quit_polling:
+ if(work_done == budget)
+ work_done--;
+
netif_rx_complete(netdev, napi);
if (!test_bit(__IXGBE_DOWN, &adapter->state))
IXGBE_WRITE_REG(&adapter->hw, IXGBE_EIMS,
@@ -1483,6 +1486,9 @@ static int ixgbe_clean(struct napi_struct *napi, int budget)
if ((!tx_cleaned && (work_done < budget)) ||
!netif_running(adapter->netdev)) {
quit_polling:
+ if(work_done == budget)
+ work_done--;
+
netif_rx_complete(netdev, napi);
ixgbe_irq_enable(adapter);
}
diff --git a/drivers/net/e100.c b/drivers/net/e100.c
index 3dbaec6..c566491 100644
--- a/drivers/net/e100.c
+++ b/drivers/net/e100.c
@@ -1998,6 +1998,10 @@ static int e100_poll(struct napi_struct *napi, int budget)
/* If no Rx and Tx cleanup work was done, exit polling mode. */
if((!tx_cleaned && (work_done == 0)) || !netif_running(netdev)) {
+
+ if(work_done == budget)
+ work_done--;
+
netif_rx_complete(netdev, napi);
e100_enable_irq(nic);
}
-
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