linux-kernel - Re: [PATCH 03/44] dmaengine: ioat: don't use DMA_ERROR

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Date:   Thu, 8 Jun 2017 09:32:18 -0700
From:   Dave Jiang <dave.jiang@...el.com>
To:     Christoph Hellwig <hch@....de>, "x86@...nel.org" <x86@...nel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>,
        "linux-c6x-dev@...ux-c6x.org" <linux-c6x-dev@...ux-c6x.org>,
        "linux-hexagon@...r.kernel.org" <linux-hexagon@...r.kernel.org>,
        "linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
        "linux-mips@...ux-mips.org" <linux-mips@...ux-mips.org>,
        "openrisc@...ts.librecores.org" <openrisc@...ts.librecores.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
        "linux-sh@...r.kernel.org" <linux-sh@...r.kernel.org>,
        "sparclinux@...r.kernel.org" <sparclinux@...r.kernel.org>,
        "linux-xtensa@...ux-xtensa.org" <linux-xtensa@...ux-xtensa.org>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-samsung-soc@...r.kernel.org" 
        <linux-samsung-soc@...r.kernel.org>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 03/44] dmaengine: ioat: don't use DMA_ERROR_CODE

On 06/08/2017 06:25 AM, Christoph Hellwig wrote:
> DMA_ERROR_CODE is not a public API and will go away.  Instead properly
> unwind based on the loop counter.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>

Acked-by: Dave Jiang <dave.jiang@...el.com>

> ---
>  drivers/dma/ioat/init.c | 24 +++++++-----------------
>  1 file changed, 7 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/dma/ioat/init.c b/drivers/dma/ioat/init.c
> index 6ad4384b3fa8..ed8ed1192775 100644
> --- a/drivers/dma/ioat/init.c
> +++ b/drivers/dma/ioat/init.c
> @@ -839,8 +839,6 @@ static int ioat_xor_val_self_test(struct ioatdma_device *ioat_dma)
>  		goto free_resources;
>  	}
>  
> -	for (i = 0; i < IOAT_NUM_SRC_TEST; i++)
> -		dma_srcs[i] = DMA_ERROR_CODE;
>  	for (i = 0; i < IOAT_NUM_SRC_TEST; i++) {
>  		dma_srcs[i] = dma_map_page(dev, xor_srcs[i], 0, PAGE_SIZE,
>  					   DMA_TO_DEVICE);
> @@ -910,8 +908,6 @@ static int ioat_xor_val_self_test(struct ioatdma_device *ioat_dma)
>  
>  	xor_val_result = 1;
>  
> -	for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++)
> -		dma_srcs[i] = DMA_ERROR_CODE;
>  	for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) {
>  		dma_srcs[i] = dma_map_page(dev, xor_val_srcs[i], 0, PAGE_SIZE,
>  					   DMA_TO_DEVICE);
> @@ -965,8 +961,6 @@ static int ioat_xor_val_self_test(struct ioatdma_device *ioat_dma)
>  	op = IOAT_OP_XOR_VAL;
>  
>  	xor_val_result = 0;
> -	for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++)
> -		dma_srcs[i] = DMA_ERROR_CODE;
>  	for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) {
>  		dma_srcs[i] = dma_map_page(dev, xor_val_srcs[i], 0, PAGE_SIZE,
>  					   DMA_TO_DEVICE);
> @@ -1017,18 +1011,14 @@ static int ioat_xor_val_self_test(struct ioatdma_device *ioat_dma)
>  	goto free_resources;
>  dma_unmap:
>  	if (op == IOAT_OP_XOR) {
> -		if (dest_dma != DMA_ERROR_CODE)
> -			dma_unmap_page(dev, dest_dma, PAGE_SIZE,
> -				       DMA_FROM_DEVICE);
> -		for (i = 0; i < IOAT_NUM_SRC_TEST; i++)
> -			if (dma_srcs[i] != DMA_ERROR_CODE)
> -				dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE,
> -					       DMA_TO_DEVICE);
> +		while (--i >= 0)
> +			dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE,
> +				       DMA_TO_DEVICE);
> +		dma_unmap_page(dev, dest_dma, PAGE_SIZE, DMA_FROM_DEVICE);
>  	} else if (op == IOAT_OP_XOR_VAL) {
> -		for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++)
> -			if (dma_srcs[i] != DMA_ERROR_CODE)
> -				dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE,
> -					       DMA_TO_DEVICE);
> +		while (--i >= 0)
> +			dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE,
> +				       DMA_TO_DEVICE);
>  	}
>  free_resources:
>  	dma->device_free_chan_resources(dma_chan);
>