linux-kernel - Re: [patch] revert: [NET]: Fix races in net_rx

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Message-Id: <200707191454.53699.olaf.kirch@oracle.com>
Date:	Thu, 19 Jul 2007 14:54:52 +0200
From:	Olaf Kirch <olaf.kirch@...cle.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Jarek Poplawski <jarkao2@...pl>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, davem@...emloft.net,
	Auke Kok <auke-jan.h.kok@...el.com>
Subject: Re: [patch] revert: [NET]: Fix races in net_rx_action vs netpoll

On Thursday 19 July 2007 14:52, Olaf Kirch wrote:
> On Thursday 19 July 2007 12:58, Ingo Molnar wrote:
> > i.e. it's the classic 'eth0 got stuck somehow' tx/rx state machine 
> > hickup symptoms, with no other bad symptoms such as lockups or crashes.
> 
> Duh, I found it.

The following patch should confirm my theory. Can you give it a try,
please?

Olaf
-- 
Olaf Kirch  |  --- o --- Nous sommes du soleil we love when we play
okir@....de |    / | \   sol.dhoop.naytheet.ah kin.ir.samse.qurax
---------
Index: build-2.6/drivers/net/e1000/e1000_main.c
===================================================================
--- build-2.6.orig/drivers/net/e1000/e1000_main.c
+++ build-2.6/drivers/net/e1000/e1000_main.c
@@ -358,6 +358,7 @@ e1000_irq_enable(struct e1000_adapter *a
 		E1000_WRITE_REG(&adapter->hw, IMS, IMS_ENABLE_MASK);
 		E1000_WRITE_FLUSH(&adapter->hw);
 	}
+	BUG_ON(atomic_read(&adapter->irq_sem) < 0);
 }
 
 static void

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