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From: Zhangfei Gao <zhangfei.gao@linaro.org>
To: Qiao Zhou <zhouqiao@marvell.com>
Cc: "Williams, Dan J" <dan.j.williams@intel.com>,
	Vinod Koul <vinod.koul@intel.com>,
	"dmaengine@vger.kernel.org" <dmaengine@vger.kernel.org>,
	LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] dma: mmp-pdma: fix irq handler overwrite physical chan issue
Date: Fri, 6 Feb 2015 13:27:41 +0800	[thread overview]
Message-ID: <CABQgh9GHPLFDkdo+5DNhDynFj9LEJXOpMAQEQDVm_fCCW2512w@mail.gmail.com> (raw)
In-Reply-To: <1423030563-2090-1-git-send-email-zhouqiao@marvell.com>

On 4 February 2015 at 14:16, Qiao Zhou <zhouqiao@marvell.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@marvell.com>

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

Thanks for the patch.

  reply	other threads:[~2015-02-06  5:27 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-02-04  6:16 [PATCH] dma: mmp-pdma: fix irq handler overwrite physical chan issue Qiao Zhou
2015-02-06  5:27 ` Zhangfei Gao [this message]
2015-02-23 11:23 ` Vinod Koul

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