netdev - What is the significance of coherent_dma

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Date:	Wed, 8 Aug 2012 09:28:17 +0530
From:	Venu Byravarasu <vbyravarasu@...dia.com>
To:	<gregkh@...uxfoundation.org>, <rdunlap@...otime.net>,
	<lars@...afoo.de>, <grant.likely@...retlab.ca>, <joe@...ches.com>
CC:	<netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<swarren@...dia.com>
Subject: What is the significance of coherent_dma_mask?

Hi,

Some of the USB drivers are setting coherent_dma_mask & many others are 
not doing it.
 From the description present in the comment beside this field in 
device.h, I could not understand its real significance.

Can some one plz let me know its real need and use case where it is 
mandatory to use it?

Thanks,
Venu

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