linux-kernel - RE: [PATCH] dma: imx-sdma: pass ->dev to dma_alloc

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Date:   Fri, 18 Jan 2019 07:41:49 +0000
From:   Robin Gong <yibin.gong@....com>
To:     Daniel Baluta <daniel.baluta@....com>,
        "vkoul@...nel.org" <vkoul@...nel.org>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>
CC:     dl-linux-imx <linux-imx@....com>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "dan.j.williams@...el.com" <dan.j.williams@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "S.j. Wang" <shengjiu.wang@....com>,
        Andy Duan <fugang.duan@....com>
Subject: RE: [PATCH] dma: imx-sdma: pass ->dev to dma_alloc_coherent() API

Reviewed-by: Robin Gong <yibin.gong@....com>
> -----Original Message-----
> From: Daniel Baluta
> Sent: 2019年1月11日 22:30
> To: vkoul@...nel.org; dmaengine@...r.kernel.org
> Cc: dl-linux-imx <linux-imx@....com>; kernel@...gutronix.de;
> dan.j.williams@...el.com; linux-kernel@...r.kernel.org; S.j. Wang
> <shengjiu.wang@....com>; Andy Duan <fugang.duan@....com>; Robin Gong
> <yibin.gong@....com>; Daniel Baluta <daniel.baluta@....com>
> Subject: [PATCH] dma: imx-sdma: pass ->dev to dma_alloc_coherent() API
> 
> From: Andy Duan <fugang.duan@....com>
> 
> Pass ->dev to dma_alloc_coherent() API. We need this becase
> dma_alloc_coherent() makes use of dev parameter and receiving NULL will
> result in a crash.
> 
> Signed-off-by: Andy Duan <fugang.duan@....com>
> Signed-off-by: Daniel Baluta <daniel.baluta@....com>
> ---
>  drivers/dma/imx-sdma.c | 15 ++++++++-------
>  1 file changed, 8 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c index
> a2b0a0e71168..26133b78ced8 100644
> --- a/drivers/dma/imx-sdma.c
> +++ b/drivers/dma/imx-sdma.c
> @@ -677,7 +677,7 @@ static int sdma_load_script(struct sdma_engine
> *sdma, void *buf, int size,
>  	int ret;
>  	unsigned long flags;
> 
> -	buf_virt = dma_alloc_coherent(NULL, size, &buf_phys, GFP_KERNEL);
> +	buf_virt = dma_alloc_coherent(sdma->dev, size, &buf_phys,
> GFP_KERNEL);
>  	if (!buf_virt) {
>  		return -ENOMEM;
>  	}
> @@ -696,7 +696,7 @@ static int sdma_load_script(struct sdma_engine
> *sdma, void *buf, int size,
> 
>  	spin_unlock_irqrestore(&sdma->channel_0_lock, flags);
> 
> -	dma_free_coherent(NULL, size, buf_virt, buf_phys);
> +	dma_free_coherent(sdma->dev, size, buf_virt, buf_phys);
> 
>  	return ret;
>  }
> @@ -1182,7 +1182,7 @@ static int sdma_request_channel0(struct
> sdma_engine *sdma)  {
>  	int ret = -EBUSY;
> 
> -	sdma->bd0 = dma_zalloc_coherent(NULL, PAGE_SIZE, &sdma->bd0_phys,
> +	sdma->bd0 = dma_zalloc_coherent(sdma->dev, PAGE_SIZE,
> &sdma->bd0_phys,
>  					GFP_NOWAIT);
>  	if (!sdma->bd0) {
>  		ret = -ENOMEM;
> @@ -1205,8 +1205,8 @@ static int sdma_alloc_bd(struct sdma_desc *desc)
>  	u32 bd_size = desc->num_bd * sizeof(struct sdma_buffer_descriptor);
>  	int ret = 0;
> 
> -	desc->bd = dma_zalloc_coherent(NULL, bd_size, &desc->bd_phys,
> -					GFP_NOWAIT);
> +	desc->bd = dma_zalloc_coherent(desc->sdmac->sdma->dev, bd_size,
> +				       &desc->bd_phys, GFP_NOWAIT);
>  	if (!desc->bd) {
>  		ret = -ENOMEM;
>  		goto out;
> @@ -1219,7 +1219,8 @@ static void sdma_free_bd(struct sdma_desc *desc)
> {
>  	u32 bd_size = desc->num_bd * sizeof(struct sdma_buffer_descriptor);
> 
> -	dma_free_coherent(NULL, bd_size, desc->bd, desc->bd_phys);
> +	dma_free_coherent(desc->sdmac->sdma->dev, bd_size, desc->bd,
> +			  desc->bd_phys);
>  }
> 
>  static void sdma_desc_free(struct virt_dma_desc *vd) @@ -1842,7 +1843,7
> @@ static int sdma_init(struct sdma_engine *sdma)
>  	/* Be sure SDMA has not started yet */
>  	writel_relaxed(0, sdma->regs + SDMA_H_C0PTR);
> 
> -	sdma->channel_control = dma_alloc_coherent(NULL,
> +	sdma->channel_control = dma_alloc_coherent(sdma->dev,
>  			MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control) +
>  			sizeof(struct sdma_context_data),
>  			&ccb_phys, GFP_KERNEL);
> --
> 2.17.1