From: Johan Hovold <johan@kernel.org>
To: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-msm@vger.kernel.org, Rob Clark <robdclark@gmail.com>,
Peter Robinson <pbrobinson@gmail.com>,
Johan Hovold <johan@kernel.org>, stable <stable@vger.kernel.org>
Subject: [PATCH] USB: ulpi: fix bus-node lookup
Date: Sat, 11 Nov 2017 16:31:18 +0100 [thread overview]
Message-ID: <20171111153118.16038-1-johan@kernel.org> (raw)
In-Reply-To: <20171111014300.2982-1-sboyd@codeaurora.org>
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@gmail.com>
Reported-by: Stephen Boyd <sboyd@codeaurora.org>
Cc: stable <stable@vger.kernel.org> # 4.10
Signed-off-by: Johan Hovold <johan@kernel.org>
---
drivers/usb/common/ulpi.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/common/ulpi.c b/drivers/usb/common/ulpi.c
index 8b351444cc40..9a2ab6751a23 100644
--- a/drivers/usb/common/ulpi.c
+++ b/drivers/usb/common/ulpi.c
@@ -180,9 +180,9 @@ static int ulpi_of_register(struct ulpi *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;
--
2.15.0
prev parent reply other threads:[~2017-11-11 15:31 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-11 1:43 [PATCH] usb: ulpi: Add missing of_node_get() in ulpi_of_register() Stephen Boyd
2017-11-11 15:25 ` Johan Hovold
2017-11-11 15:31 ` Johan Hovold [this message]
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