netdev - Re: Bug - regression - Via velocity interface coming up freezes kernel

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Date:	Mon, 23 Sep 2013 00:11:09 +0200
From:	Francois Romieu <romieu@...zoreil.com>
To:	Dirk Kraft <dirk.kraft@...il.com>
Cc:	netdev@...r.kernel.org, Julia Lawall <Julia.Lawall@...6.fr>
Subject: Re: Bug - regression - Via velocity interface coming up freezes
 kernel

Dirk Kraft <dirk.kraft@...il.com> :
[...]
> I observe problems with my machine freezing when bringing up the
> network interface (via velocity based). Detailed report below.
> 
> First message was rejected because of html. Julia Lawall, sorry about
> sending multiple copies.
> 
> [1.] One line summary of the problem:
> Via_velocity interface coming up freezes kernel - WARNING: CPU: 0 PID:
> 1529 at /build/buildd/linux-3.11.0/kernel/softirq.c:159
> local_bh_enable+0x60/0x90()

netif_receive_skb with irq disabled ?

You can try this one as a wild guess before I have more time to analyze.

diff --git a/drivers/net/ethernet/via/via-velocity.c b/drivers/net/ethernet/via/via-velocity.c
index d022bf9..64c42be 100644
--- a/drivers/net/ethernet/via/via-velocity.c
+++ b/drivers/net/ethernet/via/via-velocity.c
@@ -2172,16 +2172,13 @@ static int velocity_poll(struct napi_struct *napi, int budget)
 	unsigned int rx_done;
 	unsigned long flags;
 
-	spin_lock_irqsave(&vptr->lock, flags);
 	/*
 	 * Do rx and tx twice for performance (taken from the VIA
 	 * out-of-tree driver).
 	 */
-	rx_done = velocity_rx_srv(vptr, budget / 2);
-	velocity_tx_srv(vptr);
-	rx_done += velocity_rx_srv(vptr, budget - rx_done);
+	rx_done = velocity_rx_srv(vptr, budget);
+	spin_lock_irqsave(&vptr->lock, flags);
 	velocity_tx_srv(vptr);
-
 	/* If budget not fully consumed, exit the polling mode */
 	if (rx_done < budget) {
 		napi_complete(napi);
--
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