On Fri, Jul 31, 2009 at 11:44:09AM +0530, Viral Mehta wrote: > > As usual nice responses, thanks. > > >>> 3. USB host driver will convert that URB into different packets and will > >>> transmit to USB device. The packet size will be as defined in USB spec > >>> and as listed in protocol spec and also depends on what type of > >>> transfers are happening. > >>> > >> Yes. > >> > >> > >>> 4. USB host driver will call completion only iff all packets are > >>> transmitted and thus one URB is transmitted correctly. Yes? > >>> > >> Yes. > >> > > > > Actually no. If usb_submit_urb() succeeded then the completion routine > > will definitely be called, whether or not the URB was transmitted > > correctly. > > > Alright. > And in that case my urb->status (in my completion callback routine) will > tell whether URB transmitted correctly or not. Yes ? Yes. > And urb->status will show successful only when all packets and thus one > URB is transmitted successfully. right? Yes. Any chance to see your driver source code? thanks, greg k-h -- 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
