linux-kernel - Re: [PATCH 2/3] dmaengine: xilinx_dma: Refactor axidma channel validation

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Message-ID: <20180821155024.GH2388@vkoul-mobl>
Date:   Tue, 21 Aug 2018 21:20:24 +0530
From:   Vinod <vkoul@...nel.org>
To:     Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>
Cc:     dan.j.williams@...el.com, michal.simek@...inx.com,
        appana.durga.rao@...inx.com, lars@...afoo.de,
        dmaengine@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] dmaengine: xilinx_dma: Refactor axidma channel
 validation

On 27-07-18, 16:20, Radhey Shyam Pandey wrote:
> In axidma start_transfer, prefer checking channel states before
> other params i.e pending_list.

and what that preference be?

> 
> Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>
> ---
>  drivers/dma/xilinx/xilinx_dma.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/dma/xilinx/xilinx_dma.c b/drivers/dma/xilinx/xilinx_dma.c
> index 06d1632..a37871e 100644
> --- a/drivers/dma/xilinx/xilinx_dma.c
> +++ b/drivers/dma/xilinx/xilinx_dma.c
> @@ -1271,10 +1271,10 @@ static void xilinx_dma_start_transfer(struct xilinx_dma_chan *chan)
>  	if (chan->err)
>  		return;
>  
> -	if (list_empty(&chan->pending_list))
> +	if (!chan->idle)
>  		return;
>  
> -	if (!chan->idle)
> +	if (list_empty(&chan->pending_list))
>  		return;
>  
>  	head_desc = list_first_entry(&chan->pending_list,
> -- 
> 1.7.1
> 
> --
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-- 
~Vinod