RE: [PATCH v2] usb:musb:musb_host: Handle highmem in PIO mode

[Virupax SADASHIVPETIMATH <virupax.sadashivpetimath@xxxxxxxxxxxxxx>]

> -----Original Message-----
> From: Alan Stern [mailto:stern@xxxxxxxxxxxxxxxxxxx]
> Sent: Tuesday, August 07, 2012 11:17 PM
> To: Virupax SADASHIVPETIMATH
> Cc: balbi@xxxxxx; gregkh@xxxxxxxxxxxxxxxxxxx; linux-usb@xxxxxxxxxxxxxxx; linux-
> kernel@xxxxxxxxxxxxxxx; linus.walleij@xxxxxxxxxx; Praveena NADAHALLY; Rajaram
> REGUPATHY; Vikrant BAPAT
> Subject: Re: [PATCH v2] usb:musb:musb_host: Handle highmem in PIO mode
> 
> 
> > +	 */
> > +	if (!urb->transfer_buffer)
> > +		use_sg = true;
> 
> Here you test urb->transfer_buffer.

I will make the test as 
	if (!use_sg && !urb->transfer_buffer)
		use_sg = true;

> > +	if (use_sg) {
> > +		/* sg_miter_start is already done in musb_ep_program */
> > +		if (!sg_miter_next(&qh->sg_miter)) {
> > +			dev_err(musb->controller, "error: sg list empty\n");
> > +			sg_miter_stop(&qh->sg_miter);
> > +			status = -EINVAL;
> > +			goto done;
> > +		}
> > +		urb->transfer_buffer = qh->sg_miter.addr;
> 
> And here you set it.  As a result, on the next iteration of this
> routine the test above won't work right.  (This function gets invoked
> once for each entry in the sg list, right?)
> 
> Is there any reason to set urb->transfer_buffer here?  You could just
> use qh->sg_miter.addr directly in the musb_write_fifo() call two lines
> below.

I will change it. 

Thanks 
Virupax S 


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