[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 #1 from Greg Kroah-Hartman (greg@kroah.com) ---
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?

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