tree d1983ab9e5d532368ad82261295a78c114fa8514
parent 08e4906cc29d092ae2da0ff089efe1488e584d3c
author Frank Haverkamp <haver@linux.vnet.ibm.com> 1410359873 +0200
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1411539347 -0700

GenWQE: Support blocking when DDCB queue is busy

When the GenWQE hardware queue was busy, the driver returned simply
-EBUSY. This caused polling by applications which increased the load
on the already busy system. This change implements the possiblity to
sleep on a waitqueue instead when the DDCB queue is busy. The
requestor is woken up when there is free space on the queue again.
The old way to get -EBUSY is still available if the device is openend
with O_NONBLOCKING. The default is now blocking behavior.

Signed-off-by: Frank Haverkamp <haver@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>