netdev - Re: [PATCH][PPPOL2TP]: Fix SMP oops in pppol2tp driver

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Date:	Mon, 11 Feb 2008 19:57:20 +0100
From:	Jarek Poplawski <jarkao2@...il.com>
To:	James Chapman <jchapman@...alix.com>
CC:	netdev@...r.kernel.org
Subject: Re: [PATCH][PPPOL2TP]: Fix SMP oops in pppol2tp driver

James Chapman wrote, On 02/11/2008 10:22 AM:

> Fix locking issues in the pppol2tp driver which can cause a kernel
> crash on SMP boxes when hundreds of L2TP sessions are created/deleted
> simultaneously (ISP environment). The driver was violating read_lock()
> and write_lock() scheduling rules so we now consistently use the _irq
> variants of the lock functions.
... 

Hi,

Could you explain what exactly scheduling rules do you mean here,
and why disabling interrupts is the best solution for this?

Thanks,
Jarek P.
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