linux-kernel - Re: [PATCH 1/1] via-rhine: Fix hanging with high CPU load on low-end broads.

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Message-ID: <20111230215024.GA5513@electric-eye.fr.zoreil.com>
Date:	Fri, 30 Dec 2011 22:50:24 +0100
From:	Francois Romieu <romieu@...zoreil.com>
To:	Bjarke Istrup Pedersen <gurligebis@...too.org>
Cc:	David Miller <davem@...emloft.net>, shemminger@...tta.com,
	bhutchings@...arflare.com, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, rl@...lgate.ch
Subject: Re: [PATCH 1/1] via-rhine: Fix hanging with high CPU load on low-end broads.

Bjarke Istrup Pedersen <gurligebis@...too.org> :
[...]
> Just applied it to HEAD of net-next, and got the following compiler warning:
> drivers/net/ethernet/via/via-rhine.c:2182:13: warning:
> 'rhine_task_enable' defined but not used

You are running with CONFIG_PM disabled and a down / up loop will not
work. The patch below should hide the latter, at least as long as the
relevant workqueue does not stall for too long... Extra cancel_work in
task_enable could work too but it will look strange.

> Just so you know that too :)

Thanks for testing.

diff --git a/drivers/net/ethernet/via/via-rhine.c b/drivers/net/ethernet/via/via-rhine.c
index c57e1da..89ced1b 100644
--- a/drivers/net/ethernet/via/via-rhine.c
+++ b/drivers/net/ethernet/via/via-rhine.c
@@ -1536,6 +1536,7 @@ static int rhine_open(struct net_device *dev)
 	alloc_rbufs(dev);
 	alloc_tbufs(dev);
 	rhine_chip_reset(dev);
+	rhine_task_enable(rp);
 	init_registers(dev);
 	if (debug > 2)
 		netdev_dbg(dev, "%s() Done - status %04x MII status: %04x\n",
-- 
Ueimor
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