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

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Date:	Mon, 23 Feb 2015 16:53:30 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Qiao Zhou <zhouqiao@...vell.com>
Cc:	dan.j.williams@...el.com, dmaengine@...r.kernel.org,
	linux-kernel@...r.kernel.org, zhangfei.gao@...aro.org
Subject: Re: [PATCH] dma: mmp-pdma: fix irq handler overwrite physical chan
 issue

On Wed, Feb 04, 2015 at 02:16:03PM +0800, Qiao Zhou 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.
Applied, now

Thanks

-- 
~Vinod

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