From: Frank Haverkamp Date: Wed, 10 Sep 2014 14:37:53 +0000 (+0200) Subject: GenWQE: Support blocking when DDCB queue is busy X-Git-Tag: fixes-for-v3.18-merge-window~11^2~31 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1451f414639465995dfc1f820aa1a64723cbd662;p=pandora-kernel.git 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 Signed-off-by: Greg Kroah-Hartman --- Reading git-diff-tree failed