linux-kernel - Re: [PATCH 07/21] oss/dmabuf: use dma_map

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Date:	Fri, 26 Apr 2013 07:41:33 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Jaroslav Kysela <perex@...ex.cz>, alsa-devel@...a-project.org
Subject: Re: [PATCH 07/21] oss/dmabuf: use dma_map_single

At Thu, 25 Apr 2013 19:28:50 +0200,
Arnd Bergmann wrote:
> 
> The virt_to_bus/bus_to_virt functions have been deprecated
> for as long as I can remember, and they are used in very
> few remaining instances, usually in obscure ISA device
> drivers. The OSS sound drivers are the only ones that are
> still used on the ARM architecture, and only on some of
> the earliest StrongARM machines.
> 
> The problem for converting the OSS subsystem to use
> dma_map_single instead is that the caller of virt_to_bus
> does not have a device pointer, since the subsystem has
> never been ported to use the common device infrastructure.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Cc: Jaroslav Kysela <perex@...ex.cz>
> Cc: Takashi Iwai <tiwai@...e.de>
> Cc: alsa-devel@...a-project.org

Applied now, but the only problem is that it's difficult to test it :)
Let's see.


Thanks!

Takashi

> ---
>  sound/oss/dmabuf.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/sound/oss/dmabuf.c b/sound/oss/dmabuf.c
> index bcc3e8e..a59c888 100644
> --- a/sound/oss/dmabuf.c
> +++ b/sound/oss/dmabuf.c
> @@ -114,7 +114,7 @@ static int sound_alloc_dmap(struct dma_buffparms *dmap)
>  		}
>  	}
>  	dmap->raw_buf = start_addr;
> -	dmap->raw_buf_phys = virt_to_bus(start_addr);
> +	dmap->raw_buf_phys = dma_map_single(NULL, start_addr, dmap->buffsize, DMA_BIDIRECTIONAL);
>  
>  	for (page = virt_to_page(start_addr); page <= virt_to_page(end_addr); page++)
>  		SetPageReserved(page);
> @@ -139,6 +139,7 @@ static void sound_free_dmap(struct dma_buffparms *dmap)
>  	for (page = virt_to_page(start_addr); page <= virt_to_page(end_addr); page++)
>  		ClearPageReserved(page);
>  
> +	dma_unmap_single(NULL, dmap->raw_buf_phys, dmap->buffsize, DMA_BIDIRECTIONAL);
>  	free_pages((unsigned long) dmap->raw_buf, sz);
>  	dmap->raw_buf = NULL;
>  }
> -- 
> 1.8.1.2
> 
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