src/lib/libusb, branch releng/11.4

MFC r358841:

2020-03-13T09:17:51Z

Fix for building libusb under Linux. Sponsored by: Mellanox Technologies

MFC r357298:

2020-02-03T11:05:14Z

Add missing mutex unlock in failure case. Differential Revision: https://reviews.freebsd.org/D23430 Submitted by: cem Reported by: Coverity Coverity CID: 1368773 Sponsored by: Mellanox Technologies

MFC r356136:

2020-01-06T09:21:15Z

Implement new libusb v2.0 API function, libusb20_dev_get_stats(). This function is useful when debugging USB device issues. Sponsored by: Mellanox Technologies

MFC r353009: libusb: LIBUSB_DEBUG env var override of libusb_set_debug

2019-10-06T03:59:05Z

The debug level generally just controls verbosity of libusb for debugging libusb devices/usage. We allow the environment to set the debug level independent of the application, but the application will always override this if it explicitly sets the debug level. Changing the environment is easy, but patching the software to change the debug level isn't necessarily easy or possible. Further, there's this write-only debug_fixed variable that would seem to imply that the debug level should be fixed, but it isn't currently used. Change the logic to use strtol() so we can detect real 0 vs. conversion failure, then honor debug_fixed in libusb_set_debug.

MFC r349409 and r349410:

2019-07-03T18:25:05Z

Fix support for LIBUSB_HOTPLUG_ENUMERATE in libusb. Currently all devices are enumerated regardless of of the LIBUSB_HOTPLUG_ENUMERATE flag. Make sure when the flag is not specified no arrival events are generated for currently enumerated devices. Sponsored by: Mellanox Technologies

MFC r348797:

2019-06-11T08:50:26Z

Fix for reading the configuration descriptor in libusb. Catch invalid configuration descriptor reads early on to avoid issues with devices that don't check for a valid USB configuration read request. Submitted by: takahiro.kurosawa@gmail.com PR: 238412 Approved by: re (kib)

MFC r344795:

2019-03-26T13:46:00Z

Fix typos in libusb. Found by: Denis Ahrens Sponsored by: Mellanox Technologies

MFC r338993:

2018-10-05T07:49:01Z

When multiple threads are involved receiving completion events in LibUSB make sure there is always a master polling thread, by setting the "ctx_handler" field in the context. Else the reception of completion events can stop. This happens if event threads are created and destroyed during runtime. Found by: Ludovic Rousseau PR: 231742 Sponsored by: Mellanox Technologies

MFC r338679:

2018-09-19T08:11:44Z

Improve LibUSB debugging by simultaneously allowing both function and transfer prints. Make sure the debug level comes from the correct USB context. Found by: Ludovic Rousseau PR: 231264 Sponsored by: Mellanox Technologies

MFC r338616:

2018-09-19T07:56:19Z

Fix issues about cancelling USB transfers in LibUSB when the USB device has been detached. When a USB device has been detached the kernel file handle stops responding to commands. USB applications which continue to run after the USB device has been detached, depend on LibUSB generated events to tear down its pending USB transfers. Add code to handle the needed cleanup when processing the USB transfer(s) fails and prevent new USB transfer(s) from being submitted. Found by: Ludovic Rousseau PR: 231076 Sponsored by: Mellanox Technologies