linux-kernel - Re: [PATCH v2] dmaengine: at_xdmac: rework slave configuration part

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Date:	Tue, 2 Jun 2015 18:52:08 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Ludovic Desroches <ludovic.desroches@...el.com>
Cc:	linux-arm-kernel@...ts.infradead.org, dmaengine@...r.kernel.org,
	linux-kernel@...r.kernel.org, nicolas.ferre@...el.com,
	maxime.ripard@...e-electrons.com
Subject: Re: [PATCH v2] dmaengine: at_xdmac: rework slave configuration part

On Mon, Jun 01, 2015 at 05:40:48PM +0200, Ludovic Desroches wrote:
> @@ -604,16 +636,18 @@ at_xdmac_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
>  			return NULL;
>  		}
>  
> +		if (at_xdmac_compute_chan_conf(chan, direction))
> +			return NULL;
> +
You forgot to release the lock. Also in prev call, you are getting the desc,
that needs to be put back or moved before getting descriptor

>  		/* Linked list descriptor setup. */
>  		if (direction == DMA_DEV_TO_MEM) {
> -			desc->lld.mbr_sa = atchan->per_src_addr;
> +			desc->lld.mbr_sa = atchan->sconfig.src_addr;
>  			desc->lld.mbr_da = mem;
> -			desc->lld.mbr_cfg = atchan->cfg[AT_XDMAC_DEV_TO_MEM_CFG];
>  		} else {
>  			desc->lld.mbr_sa = mem;
> -			desc->lld.mbr_da = atchan->per_dst_addr;
> -			desc->lld.mbr_cfg = atchan->cfg[AT_XDMAC_MEM_TO_DEV_CFG];
> +			desc->lld.mbr_da = atchan->sconfig.dst_addr;
>  		}
> +		desc->lld.mbr_cfg = atchan->cfg;
>  		dwidth = at_xdmac_get_dwidth(desc->lld.mbr_cfg);
>  		fixed_dwidth = IS_ALIGNED(len, 1 << dwidth)
>  			       ? at_xdmac_get_dwidth(desc->lld.mbr_cfg)
> @@ -696,15 +730,17 @@ at_xdmac_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t buf_addr,
>  			"%s: desc=0x%p, tx_dma_desc.phys=%pad\n",
>  			__func__, desc, &desc->tx_dma_desc.phys);
>  
> +		if (at_xdmac_compute_chan_conf(chan, direction))
> +			return NULL;
same here as well

-- 
~Vinod

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