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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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