LIBUSB_ERROR_OVERFLOW with built-in Broadcom reader

[wtraylor]

The built-in smartcard reader of my laptop (“Broadcom Corp 5880”) does not reliably work with PCSC. Unpredictably, it is sometimes not recognized by PCSC.

The error code is LIBUSB_ERROR_OVERFLOW. Below is the log from journalctl --unit=pcscd after starting sudo pcscd --foreground --debug. The output is the same whether I have my smartcard (GnuPG v2.1) inserted or not.
log.txt

Looking at the libusb API documentation, I suspect that in readerfactory.c:376:RFAddReader() the buffer length is not set correctly to a multiple of the endpoint’s packet size.

I work in Arch Linux and have the latest versions from the repository:

• pcsclite: 1.8.23
• ccid: 1.4.28-1
• libusb: 1.0.21-2

[LudovicRousseau]

First I recommend to update the "reader" firmware. This may be part of a BIOS upgrade.
Many issues have been fixed by Broadcom.