Chris -
I owe you something special. Your hint 'the pointers should have different
values', made me realize exactly what was wrong. I had a linked list and was
grabbing the the wrong one.
I spent a good amount of time on this, you saved the day. Can I donate to the
organization?
Thanks so much, Happy Holidays.
Very Sincerely,
Jason
On Dec 23, 2013, at 5:44 PM, Chris Dickens <christopher.a.dick...@gmail.com>
wrote:
> mit_transfer(). The pointers should have different values. If it's the same,
> your application is trying to use the original handle.
>
> Regards,
> Chris
>
> To be thorough, you didn't specify that opened the newly discovered device. A
> segfault at usbi_mutex_lock() means it was using freed memory, which means
> you likely used a stale libusb_handle.
>
> Are you using hotplug notifications to find your device or using
> libusb_get_device_list()? In either case, your sequence of events should look
> like this:
>
> 1. Locate libusb device
> 2. Open libusb device
> 3. Claim interface
> 4. Submit transfer
> 5. Close libusb device
> 6. Locate new libusb device
> 7. Open new libusb device
> 8. Claim interface
> 9. Use the device as needed
>
> Step 6 and 7 are vitally important, to ensure you are trying to reference the
> newly enumerated device. If this is what you are doing already, then for
> debugging purposes you may wish to skip step 5 and print out the address of
> the libusb_handle before calling libusb_sub
>
>
>
> On Monday, December 23, 2013, Jason Kotzin wrote:
> That has no effect. If I remove that line the problem still persists.
>
> Very Sincerely,
> Jason
>
> > On Dec 23, 2013, at 12:06 PM, Matthias Bolte
> > <matthias.bo...@googlemail.com> wrote:
> >
> > 2013/12/23 Jason Kotzin <jasonkot...@gmail.com>:
> >> I have a USB device which has two separate devices in it, a bootloader,
> >> and the actual firmware.
> >>
> >> When I upgrade the firmware, I need to:
> >>
> >> send a message to the USB device which will jump to bootloader firmware
> >> release the interface
> >> close the usb device
> >> call libusb_exit()
> >
> > Why do you call libusb_exit() here?
> >
> > Are you calling libusb functions after libusb_exit()? If yes, then
> > errors are expected, because you told libusb that you don't need it
> > anymore by calling libusb_exit().
> >
> > --
> > Matthias Bolte
> > http://photron.blogspot.com
> >
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