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Date:   Mon, 28 Oct 2019 15:00:26 -0700
In-Reply-To: <20191028220027.251605-1-saravanak@google.com>
Message-Id: <20191028220027.251605-6-saravanak@google.com>
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References: <20191028220027.251605-1-saravanak@google.com>
Subject: [PATCH v1 5/5] of: property: Skip adding device links to suppliers
 that aren't devices
From:   Saravana Kannan <saravanak@google.com>
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "Rafael J. Wysocki" <rafael@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Frank Rowand <frowand.list@gmail.com>,
        Len Brown <lenb@kernel.org>
Cc:     Saravana Kannan <saravanak@google.com>, kernel-team@android.com,
        linux-kernel@vger.kernel.org, devicetree@vger.kernel.org,
        linux-acpi@vger.kernel.org
Content-Type: text/plain; charset="UTF-8"
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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>
---
 drivers/of/property.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/of/property.c b/drivers/of/property.c
index f16f85597ccc..21c9d251318a 100644
--- a/drivers/of/property.c
+++ b/drivers/of/property.c
@@ -1038,6 +1038,7 @@ 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);
 	/*
@@ -1062,9 +1063,10 @@ 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);
-- 
2.24.0.rc0.303.g954a862665-goog