linux-kernel - Re: [PATCH] dma: mmp-pdma: fix irq handler overwrite physical chan issue

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Date:	Fri, 6 Feb 2015 13:27:41 +0800
From:	Zhangfei Gao <zhangfei.gao@...aro.org>
To:	Qiao Zhou <zhouqiao@...vell.com>
Cc:	"Williams, Dan J" <dan.j.williams@...el.com>,
	Vinod Koul <vinod.koul@...el.com>,
	"dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] dma: mmp-pdma: fix irq handler overwrite physical chan issue

On 4 February 2015 at 14:16, Qiao Zhou <zhouqiao@...vell.com> wrote:
> Some dma channels may be reserved for other purpose in other layer,
> like secure driver in EL2/EL3. PDMA driver can see the interrupt
> status, but it should not try to handle related interrupt, since it
> doesn't belong to PDMA driver in kernel. These interrupts should be
> handled by corresponding client/module.Otherwise, it will overwrite
> illegal memory and cause unexpected issues, since pdma driver only
> requests resources for pdma channels.
>
> In PDMA driver, the reserved channels are at the end of total 32
> channels. If we find interrupt bit index is not smaller than total
> dma channels, we should ignore it.
>
> Signed-off-by: Qiao Zhou <zhouqiao@...vell.com>

Acked-by: Zhangfei Gao <zhangfei.gao@...aro.org>

Thanks for the patch.
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