linux-kernel - Re: [RFC] CONFIG_NET_DMA can hang the system if DMA engine driver uses tasklets

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Message-ID: <4CAE5C6D.6000808@emcraft.com>
Date:	Fri, 08 Oct 2010 03:49:01 +0400
From:	Ilya Yanok <yanok@...raft.com>
To:	Dan Williams <dan.j.williams@...el.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	'Vladimir K' <vlad@...raft.com>, Wolfgang Denk <wd@...x.de>
Subject: Re: [RFC] CONFIG_NET_DMA  can hang the system if DMA engine driver
 uses tasklets

Hi Dan,

08.10.2010 3:33, Dan Williams wrote:
>> 3. Try to free the descriptors not only from tasklet but also from the
>> place they get requested.
>
> This is what ioatdma and iop-adma do i.e. process descriptor reclaim
> from the allocation failure path. For example in ioat2_check_space_lock():

Thanks for the quick answer! I'll fix the mpc512x_dma driver then.

Regards, Ilya.
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