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SubjectRe: [PATCH 1/2] pci: rpadlpar: fix leaked device_node references in add/remove paths
On Fri, Mar 22, 2019 at 01:27:21PM -0500, Tyrel Datwyler wrote:
> The find_dlpar_node() helper returns a device node with its reference
> incremented. Both the add and remove paths use this helper for find the
> appropriate node, but fail to release the reference when done.
>
> Annotate the find_dlpar_node() helper with a comment about the incremented
> reference count, and call of_node_put() on the obtained device_node in the
> add and remove paths. Also, fixup a reference leak in the find_vio_slot()
> helper where we fail to call of_node_put() on the vdevice node after we
> iterate over its children.
>
> Signed-off-by: Tyrel Datwyler <tyreld@linux.vnet.ibm.com>

Both applied to pci/hotplug for v5.2, thanks!

> ---
> drivers/pci/hotplug/rpadlpar_core.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/pci/hotplug/rpadlpar_core.c b/drivers/pci/hotplug/rpadlpar_core.c
> index e2356a9c7088..182f9e3443ee 100644
> --- a/drivers/pci/hotplug/rpadlpar_core.c
> +++ b/drivers/pci/hotplug/rpadlpar_core.c
> @@ -51,6 +51,7 @@ static struct device_node *find_vio_slot_node(char *drc_name)
> if (rc == 0)
> break;
> }
> + of_node_put(parent);
>
> return dn;
> }
> @@ -71,6 +72,7 @@ static struct device_node *find_php_slot_pci_node(char *drc_name,
> return np;
> }
>
> +/* Returns a device_node with its reference count incremented */
> static struct device_node *find_dlpar_node(char *drc_name, int *node_type)
> {
> struct device_node *dn;
> @@ -306,6 +308,7 @@ int dlpar_add_slot(char *drc_name)
> rc = dlpar_add_phb(drc_name, dn);
> break;
> }
> + of_node_put(dn);
>
> printk(KERN_INFO "%s: slot %s added\n", DLPAR_MODULE_NAME, drc_name);
> exit:
> @@ -439,6 +442,7 @@ int dlpar_remove_slot(char *drc_name)
> rc = dlpar_remove_pci_slot(drc_name, dn);
> break;
> }
> + of_node_put(dn);
> vm_unmap_aliases();
>
> printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name);
> --
> 2.12.3
>

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