viktorTarasov/OpenSC — comment on commit 5a32e60a4add6045211b8d36812eee74e01621d1
File: src/pkcs11/slot.c line 295
By martinpaljak:

I guess this has to do with multiple readers? If the only reader is removed -> SCARD_E_NO_READERS_AVAILABLE. If just a single reader from many is removed: SCARD_E_UNKNOWN_READER. This is just a guess, but a test case would be nice for this.