Patch "powerpc/pseries: Release DRC when configure_connector fails" has been added to the 4.2-stable tree

This is a note to let you know that I've just added the patch titled

powerpc/pseries: Release DRC when configure_connector fails

to the 4.2-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
powerpc-pseries-release-drc-when-configure_connector-fails.patch
and it can be found in the queue-4.2 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Bharata B Rao <[email protected]>
Date: Mon, 7 Sep 2015 15:52:40 +0530
Subject: powerpc/pseries: Release DRC when configure_connector fails

From: Bharata B Rao <[email protected]>

commit daebaabb5cfbe4a6f09ca0e0f8b7673efc704960 upstream.

Commit f32393c943e2 ("powerpc/pseries: Correct cpu affinity for dlpar added cpus") moved dlpar_acquire_drc() call to before dlpar_configure_connector() call in dlpar_cpu_probe(), but missed to release the DRC if dlpar_configure_connector() failed. During CPU hotplug, if configure-connector fails for any reason, then this will result in subsequent CPU hotplug attempts to fail.

Release the acquired DRC if dlpar_configure_connector() call fails so that the DRC is left in right isolation and allocation state for the subsequent hotplug operation to succeed.

---
 arch/powerpc/platforms/pseries/dlpar.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

@@ -422,8 +422,10 @@ static ssize_t dlpar_cpu_probe(const cha
 
 	dn = dlpar_configure_connector(cpu_to_be32(drc_index), parent);
 	of_node_put(parent);
-	if (!dn)
+	if (!dn) {
+		dlpar_release_drc(drc_index);
 		return -EINVAL;
+	}
 
 	rc = dlpar_attach_node(dn);
 	if (rc) {

Patches currently in stable-queue which might be from [email protected] are

queue-4.2/powerpc-pseries-release-drc-when-configure_connector-fails.patch