linux-kernel - [PATCH 3.10 071/250] powerpc/pci/rpadlpar: Fix device reference leaks

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Message-Id: <1496876436-32402-72-git-send-email-w@1wt.eu>
Date:   Thu,  8 Jun 2017 00:57:37 +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 3.10 071/250] powerpc/pci/rpadlpar: Fix device reference leaks

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

commit 99e5cde5eae78bef95bfe7c16ccda87fb070149b upstream.

Make sure to drop any device reference taken by vio_find_node() when
adding and removing virtual I/O slots.

Fixes: 5eeb8c63a38f ("[PATCH] PCI Hotplug: rpaphp: Move VIO registration")
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Signed-off-by: Willy Tarreau <w@....eu>
---
 drivers/pci/hotplug/rpadlpar_core.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/hotplug/rpadlpar_core.c b/drivers/pci/hotplug/rpadlpar_core.c
index b29e20b..ffb2de5 100644
--- a/drivers/pci/hotplug/rpadlpar_core.c
+++ b/drivers/pci/hotplug/rpadlpar_core.c
@@ -259,8 +259,13 @@ static int dlpar_add_phb(char *drc_name, struct device_node *dn)
 
 static int dlpar_add_vio_slot(char *drc_name, struct device_node *dn)
 {
-	if (vio_find_node(dn))
+	struct vio_dev *vio_dev;
+
+	vio_dev = vio_find_node(dn);
+	if (vio_dev) {
+		put_device(&vio_dev->dev);
 		return -EINVAL;
+	}
 
 	if (!vio_register_device_node(dn)) {
 		printk(KERN_ERR
@@ -336,6 +341,9 @@ static int dlpar_remove_vio_slot(char *drc_name, struct device_node *dn)
 		return -EINVAL;
 
 	vio_unregister_device(vio_dev);
+
+	put_device(&vio_dev->dev);
+
 	return 0;
 }
 
-- 
2.8.0.rc2.1.gbe9624a