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

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Date:	Fri, 3 Aug 2012 09:26:29 +0200
From:	Virupax SADASHIVPETIMATH <virupax.sadashivpetimath@...ricsson.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	"balbi@...com" <balbi@...com>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Praveena NADAHALLY <praveen.nadahally@...ricsson.com>,
	Vikrant BAPAT <vikrant.bapat@...ricsson.com>,
	Rajaram REGUPATHY <ragupathy.rajaram@...ricsson.com>
Subject: RE: [PATCH] usb:musb:musb_host: Handle highmem in PIO mode



> -----Original Message-----
> From: Alan Stern [mailto:stern@...land.harvard.edu]
> Sent: Thursday, August 02, 2012 8:18 PM
> To: Virupax SADASHIVPETIMATH
> Cc: balbi@...com; gregkh@...uxfoundation.org; linux-usb@...r.kernel.org; linux-
> kernel@...r.kernel.org; Praveena NADAHALLY
> Subject: Re: [PATCH] usb:musb:musb_host: Handle highmem in PIO mode
> 
 
> > --- a/include/linux/usb.h
> > +++ b/include/linux/usb.h
> > @@ -21,6 +21,7 @@
> >  #include <linux/sched.h>	/* for current && schedule_timeout */
> >  #include <linux/mutex.h>	/* for struct mutex */
> >  #include <linux/pm_runtime.h>	/* for runtime PM */
> > +#include <linux/scatterlist.h>
> >
> >  struct usb_device;
> >  struct usb_driver;
> > @@ -1309,6 +1310,7 @@ struct urb {
> >  	usb_complete_t complete;	/* (in) completion routine */
> >  	struct usb_iso_packet_descriptor iso_frame_desc[0];
> >  					/* (in) ISO ONLY */
> > +	struct sg_mapping_iter sg_miter; /* handling highmem data in PIO mode */
> >  };
> 
> This is unacceptable.  Fields like this should be stored in the
> URB's hcpriv structure, not in the URB itself.

Ok I will add it in the hcpriv structure. Can you please comment on other
 part of the code also, so that all the changes can be done together. 

Thanks 
Virupax S 
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