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authorFrank Haverkamp <haver@linux.vnet.ibm.com>2014-09-10 16:37:53 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-09-23 23:15:47 -0700
commit1451f414639465995dfc1f820aa1a64723cbd662 (patch)
treed1983ab9e5d532368ad82261295a78c114fa8514 /drivers/ipack
parent08e4906cc29d092ae2da0ff089efe1488e584d3c (diff)
downloadlwn-1451f414639465995dfc1f820aa1a64723cbd662.tar.gz
lwn-1451f414639465995dfc1f820aa1a64723cbd662.zip
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>
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