Re: EOVERFLOW problem with usb_control_msg

Alan Stern wrote:
 >> I am trying to develop a kernel module for the CH341 USB-to-serial
 >> adaptor. I have working libusb code which sets up the device, but am
 >> having problems repeating this in the kernel.
 >>
 >> The first control message that reads data from the device returns with
 >> -EOVERFLOW, which the documentation describes as the USB device
 >> babbling. There is no data on the bus, however.

USBmon captured this:

ffff810035075300 1054697874 S Co:3:004:0 s c0 5f 0000 0000 04d2 1234 
=\ 	00000000 00000000 8000006c 449ba52f 00000000 00000002 000186a3 00000003
ffff810035075300 1054701674 C Co:3:004:0 -75 1234 >
ffff810035075780 1067015017 S Co:3:004:0 s 01 0b 0000 0000 0000 0
ffff810035075780 1067016275 C Co:3:004:0 0 0

The first two lines correspond to this call in my driver code:
	r=ch341_control_in(dev, 0x5f, 0, 0, buffer, size);

Frank Kingswood


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