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?

> 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?

thanks,

greg k-h
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