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[Bug 1689003] Re: USB passthrough should not fail if SET CONFIGURATION f

From: Thomas Huth
Subject: [Bug 1689003] Re: USB passthrough should not fail if SET CONFIGURATION fails
Date: Mon, 09 Nov 2020 17:03:34 -0000

The QEMU project is currently considering to move its bug tracking to another 
system. For this we need to know which bugs are still valid and which could be 
closed already. Thus we are setting older bugs to "Incomplete" now.
If you still think this bug report here is valid, then please switch the state 
back to "New" within the next 60 days, otherwise this report will be marked as 
"Expired". Thank you and sorry for the inconvenience.

** Changed in: qemu
       Status: New => Incomplete

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  USB passthrough should not fail if SET CONFIGURATION fails

Status in QEMU:

Bug description:
  QEMU's USB passthrough was not working for my new smartphone.

  While analyzing the problem, I found out that a SET CONFIGURATION
  Request was NACKed by the USB device (probably because a SET
  CONFIGURATION request was already sent from the host to the device).

  So I wrote a simple program to fake a successful call to
  libusb_set_configuration and did an LD_PRELOAD on this program before
  starting qemu, and it worked.

  Looking at QEMU's code in host-libusb.c, I can see that QEMU does not
  try to claim the interface if its call to libusb_set_configuration

  I think QEMU should try to claim the device anyway even if
  libusb_set_configuration fails.

  I did my tests against QEMU 2.6.2, but as I can see from the source
  code, this problem should happen on all versions.

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