[PATCH v2] Documentation DMA-API-HOWTO.txt Add dma mapping error check usage examples

[Jesper Juhl]

On Thu, 18 Oct 2012, Shuah Khan wrote:

> Enhance the document to discuss the importance of dma mapping error checks
> after dma_map_single() and dma_map_page() calls. Also added usage examples
> that include unmap examples in error paths when dma mapping error is returned.
> Includes correct and incorrect usages to high light some common mistakes in
> error paths especially when dma mapping fails when more than one dma mapping
> call is made.
> 
> Signed-off-by: Shuah Khan <shuah.khan at hp.com>
[...]

Nit picking :

> +Example 2: (if buffers are allocated a loop, unmap all mapped buffers when
> +	    mapping error is detected in the middle)
> +

"... if buffers are allocated in a loop..."

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Jesper Juhl <jj at chaosbits.net>       http://www.chaosbits.net/
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