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References: <20100202111135.18636.62688.stgit@pc1117.cambridge.arm.com>
Date: Tue, 2 Feb 2010 23:41:51 +0800
Message-ID: <d82e647a1002020741n4a048395o6ebf7ffaf8457819@mail.gmail.com>
Subject: Re: [PATCH] isp1760: Flush the D-cache for the pipe-in transfer 
	buffers
From: Ming Lei <tom.leiming@gmail.com>
To: Catalin Marinas <catalin.marinas@arm.com>
Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
       Greg KH <greg@kroah.com>,
       Matthew Dharm <mdharm-kernel@one-eyed-alien.net>,
       Sebastian Siewior <bigeasy@linutronix.de>
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2010/2/2 Catalin Marinas <catalin.marinas@arm.com>:

> + ? ? ? if (usb_pipein(urb->pipe) && usb_pipetype(urb->pipe) == PIPE_BULK) {
> + ? ? ? ? ? ? ? void *ptr;
> + ? ? ? ? ? ? ? for (ptr = urb->transfer_buffer;
> + ? ? ? ? ? ? ? ? ? ?ptr < urb->transfer_buffer + urb->transfer_buffer_length;
> + ? ? ? ? ? ? ? ? ? ?ptr += PAGE_SIZE)
> + ? ? ? ? ? ? ? ? ? ? ? flush_dcache_page(virt_to_page(ptr));

If the page is mapped into highmem, seems virt_to_page doesn't work well.

-- 
Lei Ming
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