hi alan: 2010/3/12 Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>: > On Fri, 12 Mar 2010, loody wrote: > >> Dear all: >> I add the urb log at the end of my letter. >> my question is: >> "len 0/122880", the first 0 means actually how many bytes it really >> transfered, right? if so, why I still get ehci_urb_done even I didn't >> get any interrupt and data is 0? > > You _did_ get an interrupt: > >> ehci ehci.0: itd_submit 1 urb 8338cc00 ep1in len 122880, 40 pkts 1 >> uframes [83b8fb80] >> ehci ehci.0: schedule devp 1 ep1in-iso period 1 start 89.0 >> ehci ehci.0: itd_submit 1 urb 8338c800 ep1in len 122880, 40 pkts 1 >> uframes [83b8fb80] >> ehci ehci.0: irq status 0001 INT > > That is the interrupt. thanks for your help :) but why there is ehci_urb_done without any interrupt happen? like below: ehci ehci.0: ehci_urb_done 1 urb 8338cc00 ep1in status 0 len 0/122880 ehci ehci.0: itd_submit 1 urb 8338cc00 ep1in len 122880, 40 pkts 1 uframes [83b8fb80] ehci ehci.0: ehci_urb_done 1 urb 8338c800 ep1in status 0 len 0/122880 ehci ehci.0: itd_submit 1 urb 8338c800 ep1in len 122880, 40 pkts 1 uframes [83b8fb80] ehci ehci.0: ehci_urb_done 1 urb 8338cc00 ep1in status 0 len 0/122880 ehci ehci.0: itd_submit 1 urb 8338cc00 ep1in len 122880, 40 pkts 1 uframes [83b8fb80] ehci ehci.0: ehci_urb_done 1 urb 8338c800 ep1in status 0 len 0/122880 ehci ehci.0: itd_submit 1 urb 8338c800 ep1in len 122880, 40 pkts 1 uframes [83b8fb80] ehci ehci.0: ehci_urb_done 1 urb 8338cc00 ep1in status 0 len 0/122880 ehci ehci.0: itd_submit 1 urb 8338cc00 ep1in len 122880, 40 pkts 1 uframes [83b8fb80] ehci ehci.0: ehci_urb_done 1 urb 8338c800 ep1in status 0 len 0/122880 ehci ehci.0: itd_submit 1 urb 8338c800 ep1in len 122880, 40 pkts 1 uframes [83b8fb80] ehci ehci.0: ehci_urb_done 1 urb 8338cc00 ep1in status 0 len 0/122880 ehci ehci.0: itd_submit 1 urb 8338cc00 ep1in len 122880, 40 pkts 1 uframes [83b8fb80] ehci ehci.0: ehci_urb_done 1 urb 8338c800 ep1in status 0 len 0/122880 ehci ehci.0: itd_submit 1 urb 8338c800 ep1in len 122880, 40 pkts 1 uframes [83b8fb80] thanks for your reply, miloody -- 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
