linux-kernel - Re: USB mass storage and ARM cache coherency

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Date:	Fri, 29 Jan 2010 17:41:11 +0100
From:	Oliver Neukum <oliver@...kum.org>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	Ming Lei <tom.leiming@...il.com>,
	Matthew Dharm <mdharm-usb@...-eyed-alien.net>,
	linux-usb@...r.kernel.org,
	"linux-kernel" <linux-kernel@...r.kernel.org>
Subject: Re: USB mass storage and ARM cache coherency

Am Freitag, 29. Januar 2010 17:34:03 schrieb Catalin Marinas:

> I was thinking about checking dev->bus->controller->dma_mask which the
> code (though not the storage one) seems to imply that if the dma_mask is
> 0, the HCD driver is only capable of PIO.

That a HCD is capable of DMA need not imply that DMA is used for every
transfer.
 
> That would be a more general solution rather than going through each HCD
> driver since my understanding is that flush_dcache_page() is only needed
> together with the mass storage support.

What about ub, nfs or nbd over a USB<->ethernet converter?
This, I am afraid is best solved at the HCD or glue layer.

	Regards
		Oliver
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