It looks like the first bad commit is this one:

commit ed42e95404a51298ea878a0d1cdcbc473612706a
Author: Marek Olšák <marek.olsak@amd.com>
Date:   Wed Jan 22 02:49:53 2014 +0100

    r600g,radeonsi: consolidate remaining obviously duplicated pipe_screen code

    Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
    Reviewed-by: Tom Stellard <thomas.stellard@amd.com>

I have definitely reproduced the problem with this commit, but failed to
reproduce it with only the one before:

commit 65dc588bfd3b8145131340ffe77f216be58378ac
Author: Marek Olšák <marek.olsak@amd.com>
Date:   Wed Jan 22 02:42:20 2014 +0100

    r600g,radeonsi: consolidate get_compute_param