On Wed, Nov 28, 2012 at 9:58 PM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > Vivek and Amit, are you two copies of the same person? No . Actually vivek's post to linux-usb forum failed . so i ended up posting for him. sorry for inconvinience . >> As urb processing is complete by the >> time urb->complete() >> is called , I think urb->use_count should be decremented first >> followed by urb completion handler call as below :- > > This is wrong. Processing continues during urb->complete, which may > even resubmit the URB. but completion handler is called when urb is completed . Also with resubmit of URB new usb i/o will take place implying previous usb i/o is already completed . i am still not clear with the need to decrement urb->use_count after completion handler . can u please let us know a bit more regarding urb->use_count usage . Also In usb.h comments for urb->use_count are "/* concurrent submissions counter */ " . does usbcore allows for concurrent submission of same urb ? > > Now, maybe your problem is that somehow urb->reject is getting set to 0 > at the wrong time. You should check its value as well as the value of> urb->use_count. Thanks for pointers . we will definately look into both fields values . Regards Amit Nagal -- 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
