The code waiting for fifo idle was incorrect and could possibly spin
forever under certain circumstances.
Signed-off-by: NThomas Hellstrom <thellstrom@vmware.com>
Reported-by: NMark Sheldon <markshel@vmware.com>
Reviewed-by: NJakob Bornecrantz <jakob@vmware.com>
Reivewed-by: NMark Sheldon <markshel@vmware.com>
Cc: <stable@vger.kernel.org>