From: Frank Rowand frank.rowand@sony.com
commit f96278810150fc39085d1872e5b39ea06366d03e upstream.
Overlay nodes added by add_changeset_node() do not have the node fields name, phandle, and type set.
The node passed to __of_attach_node() when the add node changeset entry is processed does not contain any properties. The node's properties are located in add property changeset entries that will be processed after the add node changeset is applied.
Set the node's fields in the node contained in the add node changeset entry and do not set them to incorrect values in add_changeset_node().
A visible symptom that is fixed by this patch is the names of nodes added by overlays that have an entry in /sys/bus/platform/drivers/*/ will contain the unit-address but the node-name will be <NULL>, for example, "fc4ab000.<NULL>". After applying the patch the name, in this example, for node restart@fc4ab000 is "fc4ab000.restart".
Tested-by: Alan Tull atull@kernel.org Signed-off-by: Frank Rowand frank.rowand@sony.com Cc: Phil Elwell phil@raspberrypi.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/of/dynamic.c | 25 +++++++++++++++++-------- drivers/of/overlay.c | 29 ++++++++++++++++++++++++----- 2 files changed, 41 insertions(+), 13 deletions(-)
--- a/drivers/of/dynamic.c +++ b/drivers/of/dynamic.c @@ -205,15 +205,24 @@ static void __of_attach_node(struct devi const __be32 *phandle; int sz;
- np->name = __of_get_property(np, "name", NULL) ? : "<NULL>"; - np->type = __of_get_property(np, "device_type", NULL) ? : "<NULL>"; + if (!of_node_check_flag(np, OF_OVERLAY)) { + np->name = __of_get_property(np, "name", NULL); + np->type = __of_get_property(np, "device_type", NULL); + if (!np->name) + np->name = "<NULL>"; + if (!np->type) + np->type = "<NULL>";
- phandle = __of_get_property(np, "phandle", &sz); - if (!phandle) - phandle = __of_get_property(np, "linux,phandle", &sz); - if (IS_ENABLED(CONFIG_PPC_PSERIES) && !phandle) - phandle = __of_get_property(np, "ibm,phandle", &sz); - np->phandle = (phandle && (sz >= 4)) ? be32_to_cpup(phandle) : 0; + phandle = __of_get_property(np, "phandle", &sz); + if (!phandle) + phandle = __of_get_property(np, "linux,phandle", &sz); + if (IS_ENABLED(CONFIG_PPC_PSERIES) && !phandle) + phandle = __of_get_property(np, "ibm,phandle", &sz); + if (phandle && (sz >= 4)) + np->phandle = be32_to_cpup(phandle); + else + np->phandle = 0; + }
np->child = NULL; np->sibling = np->parent->child; --- a/drivers/of/overlay.c +++ b/drivers/of/overlay.c @@ -307,10 +307,11 @@ static int add_changeset_property(struct int ret = 0; bool check_for_non_overlay_node = false;
- if (!of_prop_cmp(overlay_prop->name, "name") || - !of_prop_cmp(overlay_prop->name, "phandle") || - !of_prop_cmp(overlay_prop->name, "linux,phandle")) - return 0; + if (target->in_livetree) + if (!of_prop_cmp(overlay_prop->name, "name") || + !of_prop_cmp(overlay_prop->name, "phandle") || + !of_prop_cmp(overlay_prop->name, "linux,phandle")) + return 0;
if (target->in_livetree) prop = of_find_property(target->np, overlay_prop->name, NULL); @@ -330,6 +331,10 @@ static int add_changeset_property(struct
if (!prop) { check_for_non_overlay_node = true; + if (!target->in_livetree) { + new_prop->next = target->np->deadprops; + target->np->deadprops = new_prop; + } ret = of_changeset_add_property(&ovcs->cset, target->np, new_prop); } else if (!of_prop_cmp(prop->name, "#address-cells")) { @@ -408,9 +413,10 @@ static int add_changeset_node(struct ove struct target *target, struct device_node *node) { const char *node_kbasename; + const __be32 *phandle; struct device_node *tchild; struct target target_child; - int ret = 0; + int ret = 0, size;
node_kbasename = kbasename(node->full_name);
@@ -424,6 +430,19 @@ static int add_changeset_node(struct ove return -ENOMEM;
tchild->parent = target->np; + tchild->name = __of_get_property(node, "name", NULL); + tchild->type = __of_get_property(node, "device_type", NULL); + + if (!tchild->name) + tchild->name = "<NULL>"; + if (!tchild->type) + tchild->type = "<NULL>"; + + /* ignore obsolete "linux,phandle" */ + phandle = __of_get_property(node, "phandle", &size); + if (phandle && (size == 4)) + tchild->phandle = be32_to_cpup(phandle); + of_node_set_flag(tchild, OF_OVERLAY);
ret = of_changeset_attach_node(&ovcs->cset, tchild);