Bluetooth is inoperable in current Linus tree and the
first bad commit is:

835a6a2f8603237a3e6cded5a6765090ecb06ea5 is the first bad commit
commit 835a6a2f8603237a3e6cded5a6765090ecb06ea5
Author: Alexey Dobriyan [off-list ref]
Date:   Wed Jun 10 20:28:33 2015 +0300

    Bluetooth: Stop sabotaging list poisoning

    list_del() poisons pointers with special values, no need to overwrite t=
hem.

    Signed-off-by: Alexey Dobriyan [off-list ref]
    Signed-off-by: Marcel Holtmann [off-list ref]

My BT adapter is an intel 8087:07da
I reverted that commit and this fixed the problem for me.

Thanks, J=C3=B6rg