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 <stable@xxxxxxxxxxxxxxx> know about it.
>From daebaabb5cfbe4a6f09ca0e0f8b7673efc704960 Mon Sep 17 00:00:00 2001
From: Bharata B Rao <bharata@xxxxxxxxxxxxxxxxxx>
Date: Mon, 7 Sep 2015 15:52:40 +0530
Subject: powerpc/pseries: Release DRC when configure_connector fails
From: Bharata B Rao <bharata@xxxxxxxxxxxxxxxxxx>
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.
Fixes: f32393c943e2 ("powerpc/pseries: Correct cpu affinity for dlpar added cpus")
Signed-off-by: Bharata B Rao <bharata@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Nathan Fontenot <nfont@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/powerpc/platforms/pseries/dlpar.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/arch/powerpc/platforms/pseries/dlpar.c
+++ b/arch/powerpc/platforms/pseries/dlpar.c
@@ -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 bharata@xxxxxxxxxxxxxxxxxx are
queue-4.2/powerpc-pseries-release-drc-when-configure_connector-fails.patch
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