linux-kernel - Re: [PATCH V2] dma: tegra: avoid channel lock up after free

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Message-ID: <50913CAC.5090808@nvidia.com>
Date:	Wed, 31 Oct 2012 20:28:52 +0530
From:	Laxman Dewangan <ldewangan@...dia.com>
To:	Dmitry Osipenko <digetx@...il.com>
CC:	"swarren@...dotorg.org" <swarren@...dotorg.org>,
	"vinod.koul@...el.com" <vinod.koul@...el.com>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2] dma: tegra: avoid channel lock up after free

On Tuesday 30 October 2012 04:50 AM, Dmitry Osipenko wrote:
> Fixed channel "lock up" after free.
>
> Lock scenario: Channel 1 was allocated and prepared as slave_sg, used and freed.
> Now preparation of cyclic dma on channel 1 will fail with err "DMA configuration
> conflict" because tdc->isr_handler still selected to handle_once_dma_done.
>
> This happens because tegra_dma_abort_all() won't be called on channel freeing
> if pending list is empty or channel not busy. We need to clear isr_handler
> on channel freeing to avoid locking. Also I added small optimization to prepare
> functions, so current channel type checked before making allocations.
>
> Signed-off-by: Dmitry Osipenko<digetx@...il.com>
> ---

Looks good to me.
Acked-by: Laxman Dewangan <ldewangan@...dia.com>

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