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Re: [Fwd: Re: possible bug x86 2.4.2 SMP in IP receive stack]

To: andrewm@xxxxxxxxxx, feldy@xxxxxxxx
Subject: Re: [Fwd: Re: possible bug x86 2.4.2 SMP in IP receive stack]
From: Bob Felderman <feldy@xxxxxxxx>
Date: Mon, 5 Mar 2001 15:53:18 -0800 (PST)
Cc: kuznet@xxxxxxxxxxxxx, netdev@xxxxxxxxxxx
Sender: owner-netdev@xxxxxxxxxxx
=> Bob Felderman wrote:
=> > 
=> > If I only use a single CPU with the same kernel, I do NOT have
=> > any problems.
=> 
=> Oh.
=> 
=> Your driver doesn't appear to have any SMP locking.  The
=> same skb can be fed to the network stack twice.
=> 

I wondered the same thing.

Earlier today (before I sent you the oopses) I 
added a mutex to 
surround my linux interrupt routine. So the oopses you
have are with a mutex around the interrupt routine.

I'm going to check again to make sure it is really 
enforcing serialization.

Bob


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