linux-kernel - [PATCH] fix plip 1

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Message-ID: <Pine.LNX.4.64.0711222053170.15336@artax.karlin.mff.cuni.cz>
Date:	Thu, 22 Nov 2007 21:19:39 +0100 (CET)
From:	Mikulas Patocka <mikulas@...ax.karlin.mff.cuni.cz>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
cc:	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] fix plip 1

Hi

netif_rx is meant to be called from interrupts because it doesn't wake up 
ksoftirqd. For calling from outside interrupts, netif_rx_ni exists.

This patch fixes plip to use netif_rx_ni. It fixes the infamous error 
"NOHZ: local_softirq_panding 08" that happens on some machines with NOHZ 
and plip --- it is caused by the fact that softirq is pending and 
ksoftirqd is sleeping.

Mikulas

diff -u -r linux-2.6.24-rc2/drivers/net/plip.c linux-2.6.24-test/drivers/net/plip.c
--- linux-2.6.24-rc2/drivers/net/plip.c	2007-11-06 22:57:46.000000000 +0100
+++ linux-2.6.24-test/drivers/net/plip.c	2007-11-22 21:11:28.000000000 +0100
@@ -663,7 +663,7 @@
 	case PLIP_PK_DONE:
 		/* Inform the upper layer for the arrival of a packet. */
 		rcv->skb->protocol=plip_type_trans(rcv->skb, dev);
-		netif_rx(rcv->skb);
+		netif_rx_ni(rcv->skb);
 		dev->last_rx = jiffies;
 		dev->stats.rx_bytes += rcv->length.h;
 		dev->stats.rx_packets++;
-
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