linux-kernel - Re: [PATCH] usb:musb:musb_host: Handle highmem in PIO mode

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Message-ID: <20120802110010.GA5443@kroah.com>
Date:	Thu, 2 Aug 2012 04:00:10 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Virupax Sadashivpetimath <virupax.sadashivpetimath@...ricsson.com>
Cc:	balbi@...com, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, praveen.nadahally@...ricsson.com
Subject: Re: [PATCH] usb:musb:musb_host: Handle highmem in PIO mode

On Thu, Aug 02, 2012 at 12:06:42PM +0530, Virupax Sadashivpetimath wrote:
> In case of USB bulk transfer, when himem page
> is received, the usb_sg_init function sets the
> urb transfer buffer to NULL. When such URB
> transfer is handled, kernel crashes in PIO mode.
> Handle this by mapping the highmem buffer in PIO mode.
> 
> Signed-off-by: Virupax Sadashivpetimath <virupax.sadashivpetimath@...ricsson.com>

Why is this not a problem in any other host controller?  Are you sure
this fix is correct?  Why do you need to modify the struct urb for this?

greg k-h
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