linux-kernel - Re: [PATCH] ARM: dmabounce: fix partial sync in dma_sync_single

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Message-ID: <20100412193536.GO3048@n2100.arm.linux.org.uk>
Date:	Mon, 12 Apr 2010 20:35:36 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org,
	davem@...emloft.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: dmabounce: fix partial sync in dma_sync_single_*
	API

On Mon, Apr 05, 2010 at 12:39:32PM +0900, FUJITA Tomonori wrote:
> I don't have arm hardware that uses dmabounce so I can't confirm the
> problem but seems that dmabounce doesn't work for some drivers...

Patch reviews fine, except for one niggle.  I too don't have hardware
I can test (well, I do except the kernel stopped supporting the UDA1341
audio codec on the SA1110 Neponset.)

> @@ -171,10 +172,17 @@ find_safe_buffer(struct dmabounce_device_info *device_info, dma_addr_t safe_dma_
>  	read_lock_irqsave(&device_info->lock, flags);
>  
>  	list_for_each_entry(b, &device_info->safe_buffers, node)
> -		if (b->safe_dma_addr == safe_dma_addr) {
> -			rb = b;
> -			break;
> -		}
> +		if (for_sync) {
> +			if (b->safe_dma_addr <= safe_dma_addr &&
> +			    safe_dma_addr < b->safe_dma_addr + b->size) {
> +				rb = b;
> +				break;
> +			}
> +		} else
> +			if (b->safe_dma_addr == safe_dma_addr) {
> +				rb = b;
> +				break;
> +			}

This is the niggle; I don't like this indentation style.  If you want to
indent this if () statement, then please format like this:

		} else {
			if (b->safe...) {
				...
			}
		}

or format it as:

		} else if (b->safe...) {
			...
		}
--
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