> On Sat, Aug 23, 2014 at 11:37:28PM +0800, peter li wrote: >> 1.In which case will i get EPROTO during commuicate with usb device, i >> called usb_bulk_msg in my usb_drv > > What driver is this? > I write the driver based on the old version usb-skeleton.c, the driver works fine,the error EPROTO will happen one time in about several thousand time. >> 2.while i continue plug and pull the usb device a few times because of >> EPROTO and some times (errno=110) error , the usb device is not probed, >> nothing print in dmesg. > > Sounds like a broken device, is the firmware crashed in it? Does the > device see the USB connection? > the usb device is ok, i reboot the pc or move the usb device to another pc , it works fine. some message in dmesg: usb 2-1:device descriptor read/64 ,error -62 usb 2-1:new full speed USB device using ohci and address 118 usb 2-1:can't config #1,error -71 .... usb 2-1:device not accpting address 119, error -71 ...... usb 2-1:new full speed USB device using ohci and address 118 usb 2-1:device descriptor read/64 ,error -62 usb 2-1:device descriptor read/64 ,error -62 usb 2-1:new full speed USB device using ohci and address 119 usb 2-1:device descriptor read/64 ,error -62 usb 2-1:device descriptor read/64 ,error -62 ....... some times retry by pull and plug the usb device ........ stop probe , nothing in dmesg -- 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
