linux-kernel - [PATCH 3.10 090/250] powerpc/ibmebus: Fix further device reference leaks

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Message-Id: <1496876436-32402-91-git-send-email-w@1wt.eu>
Date:   Thu,  8 Jun 2017 00:57:56 +0200
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux@...ck-us.net
Cc:     Johan Hovold <johan@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>, Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 090/250] powerpc/ibmebus: Fix further device reference leaks

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

commit 815a7141c4d1b11610dccb7fcbb38633759824f2 upstream.

Make sure to drop any reference taken by bus_find_device() when creating
devices during init and driver registration.

Fixes: 55347cc9962f ("[POWERPC] ibmebus: Add device creation and bus probing based on of_device")
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Signed-off-by: Willy Tarreau <w@....eu>
---
 arch/powerpc/kernel/ibmebus.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/kernel/ibmebus.c b/arch/powerpc/kernel/ibmebus.c
index 8220baa..cce1a44 100644
--- a/arch/powerpc/kernel/ibmebus.c
+++ b/arch/powerpc/kernel/ibmebus.c
@@ -180,6 +180,7 @@ static int ibmebus_create_device(struct device_node *dn)
 static int ibmebus_create_devices(const struct of_device_id *matches)
 {
 	struct device_node *root, *child;
+	struct device *dev;
 	int ret = 0;
 
 	root = of_find_node_by_path("/");
@@ -188,9 +189,12 @@ static int ibmebus_create_devices(const struct of_device_id *matches)
 		if (!of_match_node(matches, child))
 			continue;
 
-		if (bus_find_device(&ibmebus_bus_type, NULL, child,
-				    ibmebus_match_node))
+		dev = bus_find_device(&ibmebus_bus_type, NULL, child,
+				      ibmebus_match_node);
+		if (dev) {
+			put_device(dev);
 			continue;
+		}
 
 		ret = ibmebus_create_device(child);
 		if (ret) {
-- 
2.8.0.rc2.1.gbe9624a