linux-kernel - Re: [PATCH] dmaengine: pl330: fix the race condition in pl330 driver.

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Message-ID: <551874EB.1040405@broadcom.com>
Date:	Sun, 29 Mar 2015 14:55:55 -0700
From:	Scott Branden <sbranden@...adcom.com>
To:	Dan Williams <dan.j.williams@...el.com>,
	Vinod Koul <vinod.koul@...el.com>,
	Jaswinder Singh <jassi.brar@...sung.com>,
	Jassi Brar <jassisinghbrar@...il.com>,
	Jassi Brar <jaswinder.singh@...aro.org>
CC:	<bcm-kernel-feedback-list@...adcom.com>,
	Dmitry Torokhov <dtor@...gle.com>,
	Anatol Pomazao <anatol@...gle.com>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	ismail <ismail@...adcom.com>
Subject: Re: [PATCH] dmaengine: pl330: fix the race condition in pl330 driver.

Adding original author Jaswinder Singh (3 email addresses) to email list.

On 15-03-26 04:55 PM, Scott Branden wrote:
> From: ismail <ismail@...adcom.com>
>
> Update the thread running index before issuing the
> GO command to the DMAC.
>
> Tested-by: Mohamed Ismail Abdul Packir Mohamed <ismail@...adcom.com>
> Reviewed-by: Ray Jui <rjui@...adcom.com>
> Reviewed-by: Arun Parameswaran <aparames@...adcom.com>
> Reviewed-by: Scott Branden <sbranden@...adcom.com>
> Signed-off-by: Scott Branden <sbranden@...adcom.com>
> Signed-off-by: Mohamed Ismail Abdul Packir Mohamed <ismail@...adcom.com>
> ---
>   drivers/dma/pl330.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
> index 0e1f567..631642d 100644
> --- a/drivers/dma/pl330.c
> +++ b/drivers/dma/pl330.c
> @@ -1072,11 +1072,11 @@ static bool _trigger(struct pl330_thread *thrd)
>   	/* Set to generate interrupts for SEV */
>   	writel(readl(regs + INTEN) | (1 << thrd->ev), regs + INTEN);
>
> +	thrd->req_running = idx;
> +
>   	/* Only manager can execute GO */
>   	_execute_DBGINSN(thrd, insn, true);
>
> -	thrd->req_running = idx;
> -
>   	return true;
>   }
>
>

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