On Wed, 21 Oct 2009, Pete Zaitcev wrote: > On Wed, 21 Oct 2009 11:22:42 -0400 (EDT), Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > > > I was looking into adapting usbmon to handle URBs with scatter-gather > > lists. How to do it isn't obvious. In particular, what should happen > > if some of the sg buffers are in addressable memory and some aren't? > > My first instinct is just return an error 'D', all or nothing. > > How soon do you want this? If couple of weeks are ok, I can swing it. I can do it, if it's okay with you. I just wondered how you wanted to handle these corner cases. (I've got a patch adding s-g support to ehci-hcd, and not having usbmon available would be a big drawback.) Another possibility is to return an initial segment of the data, up to the first non-addressable buffer. Would that work? I don't know if usbmon can handle storing a partial (> 0 but < transfer_buffer_length) data block. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
