linux-kernel - [PATCH] of: Fix cpu node iterator to not ignore disabled cpu nodes

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Message-Id: <20181031144226.26747-1-robh@kernel.org>
Date:   Wed, 31 Oct 2018 09:42:26 -0500
From:   Rob Herring <robh@...nel.org>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Christian Zigotzky <chzigotzky@...osoft.de>,
        Frank Rowand <frowand.list@...il.com>
Subject: [PATCH] of: Fix cpu node iterator to not ignore disabled cpu nodes

In most cases, nodes with 'status = "disabled";' are treated as if the
node is not present though it is a common bug to forget to check that.
However, cpu nodes are different in that "disabled" simply means offline
and the OS can bring the CPU core online. Commit f1f207e43b8a ("of: Add
cpu node iterator for_each_of_cpu_node()") followed the common behavior
of ignoring disabled cpu nodes. This breaks some powerpc systems (at
least NXP P50XX/e5500). Fix this by dropping the status check.

Fixes: 651d44f9679c ("of: use for_each_of_cpu_node iterator")
Fixes: f1f207e43b8a ("of: Add cpu node iterator for_each_of_cpu_node()")
Reported-by: Michael Ellerman <mpe@...erman.id.au>
Cc: Christian Zigotzky <chzigotzky@...osoft.de>
Cc: Frank Rowand <frowand.list@...il.com>
Signed-off-by: Rob Herring <robh@...nel.org>
---
 drivers/of/base.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/of/base.c b/drivers/of/base.c
index cc62da278663..e47c5ce6cd58 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -776,8 +776,6 @@ struct device_node *of_get_next_cpu_node(struct device_node *prev)
 		if (!(of_node_name_eq(next, "cpu") ||
 		      (next->type && !of_node_cmp(next->type, "cpu"))))
 			continue;
-		if (!__of_device_is_available(next))
-			continue;
 		if (of_node_get(next))
 			break;
 	}
-- 
2.19.1