linux-kernel - Re: [PATCH v8 11/19] dmaengine: tegra-apb: Remove duplicated pending_sg

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Date:   Fri, 14 Feb 2020 14:13:13 +0000
From:   Jon Hunter <jonathanh@...dia.com>
To:     Dmitry Osipenko <digetx@...il.com>,
        Laxman Dewangan <ldewangan@...dia.com>,
        Vinod Koul <vkoul@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>
CC:     <dmaengine@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v8 11/19] dmaengine: tegra-apb: Remove duplicated
 pending_sg_req checks


On 09/02/2020 16:33, Dmitry Osipenko wrote:
> There are few place in the code which check whether pending_sg_req list is
> empty despite of the check already being done. Let's remove the duplicated
> checks to keep code clean.
> 
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  drivers/dma/tegra20-apb-dma.c | 12 ------------
>  1 file changed, 12 deletions(-)
> 
> diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c
> index 22b88ccff05d..049e98ae1240 100644
> --- a/drivers/dma/tegra20-apb-dma.c
> +++ b/drivers/dma/tegra20-apb-dma.c
> @@ -504,9 +504,6 @@ static void tdc_start_head_req(struct tegra_dma_channel *tdc)
>  {
>  	struct tegra_dma_sg_req *sg_req;
>  
> -	if (list_empty(&tdc->pending_sg_req))
> -		return;
> -
>  	sg_req = list_first_entry(&tdc->pending_sg_req, typeof(*sg_req), node);
>  	tegra_dma_start(tdc, sg_req);
>  	sg_req->configured = true;
> @@ -518,9 +515,6 @@ static void tdc_configure_next_head_desc(struct tegra_dma_channel *tdc)
>  {
>  	struct tegra_dma_sg_req *hsgreq, *hnsgreq;
>  
> -	if (list_empty(&tdc->pending_sg_req))
> -		return;
> -
>  	hsgreq = list_first_entry(&tdc->pending_sg_req, typeof(*hsgreq), node);
>  	if (!list_is_last(&hsgreq->node, &tdc->pending_sg_req)) {
>  		hnsgreq = list_first_entry(&hsgreq->node, typeof(*hnsgreq),
> @@ -567,12 +561,6 @@ static bool handle_continuous_head_request(struct tegra_dma_channel *tdc,
>  {
>  	struct tegra_dma_sg_req *hsgreq;
>  
> -	if (list_empty(&tdc->pending_sg_req)) {
> -		dev_err(tdc2dev(tdc), "DMA is running without req\n");
> -		tegra_dma_stop(tdc);
> -		return false;
> -	}
> -
>  	/*
>  	 * Check that head req on list should be in flight.
>  	 * If it is not in flight then abort transfer as
> 

Acked-by: Jon Hunter <jonathanh@...dia.com>

Thanks
Jon

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