Bug 231322

Summary: libusb_bulk_transfer() does not fail (with LIBUSB_ERROR_NO_DEVICE) if the device is not more present
Product: Base System Reporter: Ludovic Rousseau <ludovic.rousseau+freebsd>
Component: usbAssignee: freebsd-usb (Nobody) <usb>
Status: Closed DUPLICATE    
Severity: Affects Only Me CC: hselasky
Priority: ---    
Version: CURRENT   
Hardware: Any   
OS: Any   
Attachments:
Description Flags
Check the USB device is still present none

Description Ludovic Rousseau 2018-09-12 09:08:07 UTC 
After a USB device has been removed I can (try to) send a USB packet using libusb_bulk_transfer(). The program then blocks instead of returning an error.

I get the logs:
LIBUSB_FUNCTION: libusb_bulk_transfer enter
LIBUSB_FUNCTION: libusb_submit_transfer enter
dev: 0x28c09b80
pxfer0: 0x28c2f0f0
pxfer1: 0x28c2f12c
LIBUSB_FUNCTION: libusb_submit_transfer leave 0
LIBUSB_FUNCTION: libusb_handle_events_timeout_completed enter
LIBUSB_FUNCTION: libusb10_handle_events_sub enter

I added the dev and pxfer* logs.

Then the program is blocked until I kill it using Ctrl-C.

Under GNU/Linux libusb_bulk_transfer() returns the error LIBUSB_ERROR_NO_DEVICE.

Maybe libusb_bulk_transfer() or libusb_submit_transfer() would check the USB device is still present.

I can test patches. The problem is easy to reproduce for me.
Comment 1 Ludovic Rousseau 2018-09-12 09:50:35 UTC 
I propose the attached patch.
It works for me.
Comment 2 Ludovic Rousseau 2018-09-12 09:51:06 UTC 
Created attachment 197049 [details]
Check the USB device is still present
Comment 3 Hans Petter Selasky freebsd_committer freebsd_triage 2018-09-12 10:37:16 UTC 
See updated patch on Bug 231076 .
Comment 4 Hans Petter Selasky freebsd_committer freebsd_triage 2018-09-12 13:32:00 UTC 

*** This bug has been marked as a duplicate of bug 231076 ***