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FROMGIT: of: property: Skip adding device links to suppliers that aren't devices

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Some devices need to be initialized really early and can't wait for
driver core or drivers to be functional.  These devices are typically
initialized without creating a struct device for their device nodes.

If a supplier ends up being one of these devices, skip trying to add
device links to them.

Signed-off-by: Saravana Kannan <saravanak@google.com>
Link: https://lore.kernel.org/r/20191028220027.251605-6-saravanak@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry-pick from commit 15956dad5c1016155c82d094f8c1273a30f79c3d
 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git driver-core-next)
Bug: 143308885
Change-Id: I0d5a38eec05f5546fe11c23c0d09103ccc35097e
This commit is contained in:
Saravana Kannan 2019-10-28 15:00:26 -07:00
parent 806aeaebc9
commit 9851ce46a4
1 changed files with 3 additions and 1 deletions
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4
drivers/of/property.c
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@ -1024,6 +1024,7 @@ static int of_link_to_phandle(struct device *dev, struct device_node *sup_np,
struct device *sup_dev;
int ret = 0;
struct device_node *tmp_np = sup_np;
int is_populated;
of_node_get(sup_np);
/*
@ -1048,9 +1049,10 @@ static int of_link_to_phandle(struct device *dev, struct device_node *sup_np,
return -EINVAL;
}
sup_dev = get_dev_from_fwnode(&sup_np->fwnode);
is_populated = of_node_check_flag(sup_np, OF_POPULATED);
of_node_put(sup_np);
if (!sup_dev)
return -EAGAIN;
return is_populated ? 0 : -EAGAIN;
if (!device_link_add(dev, sup_dev, dl_flags))
ret = -EAGAIN;
put_device(sup_dev);