linux-kernel - [PATCH 4.14 70/75] USB: ulpi: fix bus-node lookup

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Message-Id: <20171207130821.641730859@linuxfoundation.org>
Date:   Thu,  7 Dec 2017 14:08:32 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Peter Robinson <pbrobinson@...il.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Johan Hovold <johan@...nel.org>
Subject: [PATCH 4.14 70/75] USB: ulpi: fix bus-node lookup

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Johan Hovold <johan@...nel.org>

commit 33c309ebc797b908029fd3a0851aefe697e9b598 upstream.

Fix bus-node lookup during registration, which ended up searching the whole
device tree depth-first starting at the parent (or grand parent) rather
than just matching on its children.

To make things worse, the parent (or grand-parent) node could end being
prematurely freed as well.

Fixes: ef6a7bcfb01c ("usb: ulpi: Support device discovery via DT")
Reported-by: Peter Robinson <pbrobinson@...il.com>
Reported-by: Stephen Boyd <sboyd@...eaurora.org>
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/common/ulpi.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/usb/common/ulpi.c
+++ b/drivers/usb/common/ulpi.c
@@ -183,9 +183,9 @@ static int ulpi_of_register(struct ulpi
 	/* Find a ulpi bus underneath the parent or the grandparent */
 	parent = ulpi->dev.parent;
 	if (parent->of_node)
-		np = of_find_node_by_name(parent->of_node, "ulpi");
+		np = of_get_child_by_name(parent->of_node, "ulpi");
 	else if (parent->parent && parent->parent->of_node)
-		np = of_find_node_by_name(parent->parent->of_node, "ulpi");
+		np = of_get_child_by_name(parent->parent->of_node, "ulpi");
 	if (!np)
 		return 0;