On Sat, 2016-08-20 at 14:14 +0200, Julio Guerra wrote: > >> Another example: > >>> 00 00 00 00 00 00 00 01 > >> ... > >>> 01 00 00 00 00 00 00 00 > >> ... > >>> 00 01 00 00 00 00 00 00 > >> ... > >>> 00 00 01 00 00 00 00 00 > >> after a random number of times, while usbmon shows the usb payload > >> "00 00 00 00 00 00 00 01". > > > > Hi, how many bytes does read() return? > > > > Exactly 8 bytes, always. I set the tty in raw non-canonical mode with > vmin = 8 and vtime = 0. I also tried with vmin = 1 and did the copy of > exactly 8 bytes by looping in userspace, without any improvement. > > I wrote a small workaround for now that detects this problem (because I > exactly know what the buffer is supposed to look like) to close() and > re-open() the device. The next read buffer is then correct. > Please activate dynamic debugging for the tty and cdc_acm driver. We need to know where the corruption happens. Regards Oliver -- 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
