linux-kernel - [PATCH 2/2] pci: rpaphp: get/put device node reference during slot alloc/dealloc

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Date:   Fri, 22 Mar 2019 13:27:22 -0500
From:   Tyrel Datwyler <tyreld@...ux.vnet.ibm.com>
To:     bhelgaas@...gle.com
Cc:     linux-pci@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org,
        Tyrel Datwyler <tyreld@...ux.vnet.ibm.com>
Subject: [PATCH 2/2] pci: rpaphp: get/put device node reference during slot alloc/dealloc

When allocating the slot structure we store a pointer to the associated
device_node. We really should be incrementing the reference count, so
add an of_node_get() during slot alloc and an of_node_put() during slot
dealloc.

Signed-off-by: Tyrel Datwyler <tyreld@...ux.vnet.ibm.com>
---
 drivers/pci/hotplug/rpaphp_slot.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/hotplug/rpaphp_slot.c b/drivers/pci/hotplug/rpaphp_slot.c
index 5282aa3e33c5..93b4a945c55d 100644
--- a/drivers/pci/hotplug/rpaphp_slot.c
+++ b/drivers/pci/hotplug/rpaphp_slot.c
@@ -21,6 +21,7 @@
 /* free up the memory used by a slot */
 void dealloc_slot_struct(struct slot *slot)
 {
+	of_node_put(slot->dn);
 	kfree(slot->name);
 	kfree(slot);
 }
@@ -36,7 +37,7 @@ struct slot *alloc_slot_struct(struct device_node *dn,
 	slot->name = kstrdup(drc_name, GFP_KERNEL);
 	if (!slot->name)
 		goto error_slot;
-	slot->dn = dn;
+	slot->dn = of_node_get(dn);
 	slot->index = drc_index;
 	slot->power_domain = power_domain;
 	slot->hotplug_slot.ops = &rpaphp_hotplug_slot_ops;
-- 
2.12.3