On Thu, 6 Jun 2019, Bollinger, Seth wrote: > > On Jun 6, 2019, at 9:36 AM, Greg KH <gre...@linuxfoundation.org> wrote: > > > > If the descriptor changes between resets, that means that something > > changed and we need to start over with it. What is the problem that > > this is causing > > We have code doing a USBDEVFS_RESET that fails when the ioctl returns EPERM.
EPERM means that the file descriptor was not opened with write access. It has nothing to do with reset failures. > I think the solution might be to simply not do the reset for this device, but > wanted to check if anyone else had encountered this issue. It's true that many programs using usbfs do unnecessary resets. If you don't need it, don't do it! Alan Stern
