[Bug 209411] When retrieving string descriptor from mobile device returns eproto error

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=209411

--- Comment #2 from rachithas104@gmail.com ---
(In reply to Greg Kroah-Hartman from comment #1)
> On Sun, Sep 27, 2020 at 05:51:20PM +0000,
> bugzilla-daemon@bugzilla.kernel.org wrote:
> > https://bugzilla.kernel.org/show_bug.cgi?id=209411
> > 
> >             Bug ID: 209411
> >            Summary: When retrieving string descriptor from mobile device
> >                     returns eproto error
> >            Product: Drivers
> >            Version: 2.5
> >     Kernel Version: 4.19
> >           Hardware: All
> >                 OS: Linux
> >               Tree: Mainline
> >             Status: NEW
> >           Severity: normal
> >           Priority: P1
> >          Component: USB
> >           Assignee: drivers_usb@kernel-bugs.kernel.org
> >           Reporter: rachithas104@gmail.com
> >         Regression: No
> > 
> > I am trying to get get string descriptor from mobile phone,however when
> > trying
> > to retrieve one particular index it returns EPROTO,
> > 
> > dev->fd, USB_DIR_IN,USB_REQ_GET_DESCRIPTOR,DESCRIPT_STRING * 256 + index,   
> >                                               languageid, sizeof buf, buf);
> > 
> > Return value is -1 for  ioctl(fd, USBDEVFS_CONTROL, &ioctl_ctrl);
> > 
> > kernel: [ 7084.327097] usb 1-1.2: reset high-speed USB device number 12
> using
> > ehci-pci
> > kernel: [ 7084.831056] usb 1-1.2: device not accepting address 12, error
> -71
> > kernel: [ 7085.119075] usb 1-1.2: reset high-speed USB device number 12
> using
> > ehci-pci
> >  kernel: [ 7085.431054] usb 1-1.2: reset high-speed USB device number 12
> >  using
> > ehci-pci
> > [ 7085.935069] usb 1-1.2: device not accepting address 12, error -71
> > [ 7086.227132] usb 1-1.2: reset high-speed USB device number 12 using
> > ehci-pci
> > S[ 7087.321929] usb 1-1.2: usbfs: USBDEVFS_CONTROL failed cmd ctxusb rqt
> 128
> > rq
> > 6 len 255 ret -71
> >   kernel: [ 7087.607093] usb 1-1.2: reset high-speed USB device number 12
> >   using
> > ehci-pci
> > 
> > My URB request and without my program in picture request is same
> 
> Not all strings are readable from the device, are you sure that is a
> valid string descriptor index to be requesting?

Yes its valid string,

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