linux-kernel - Re: locking api self-test hanging

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Message-ID: <20080304084024.GA3980@ff.dom.local>
Date:	Tue, 4 Mar 2008 08:40:24 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	netdev@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org,
	Stephen Hemminger <shemminger@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: locking api self-test hanging

On 04-03-2008 06:05, Andrew Morton wrote:
...
>>>> And I've fully bisected this hang twice and both times came up with
>>>>
>>>> commit 33f807ba0d9259e7c75c7a2ce8bd2787e5b540c7
>>>> Author: Stephen Hemminger <shemminger@...ux-foundation.org>
>>>> Date:   Mon Nov 19 19:24:52 2007 -0800
>>>>
>>>>     [NETPOLL]: Kill NETPOLL_RX_DROP, set but never tested.
>>>>
>>>> which is stupid because that patch doesn't do anything.

...or maybe apparently doesn't do anything?

@@ -128,13 +127,11 @@ static int poll_one_napi(struct netpoll_info *npinfo,
        if (!test_bit(NAPI_STATE_SCHED, &napi->state))
                return budget;
 
-       npinfo->rx_flags |= NETPOLL_RX_DROP;


But in a next patch we can see:

@@ -51,12 +50,12 @@ static inline int netpoll_rx(struct sk_buff *skb)
        unsigned long flags;
        int ret = 0;
 
-       if (!npinfo || (!npinfo->rx_np && !npinfo->rx_flags))
+       if (!npinfo || !npinfo->rx_np)

So, it seems rx_flags could have been tested here for NETPOLL_RX_DROP
yet?

Regards,
Jarek P.
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