linux-kernel - [PATCH 4.14 06/15] base: core: Remove WARN

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Date:   Fri,  5 Feb 2021 15:08:51 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Mark Brown <broonie@...nel.org>,
        Benjamin Gaignard <benjamin.gaignard@...com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Sudip Mukherjee <sudipm.mukherjee@...il.com>
Subject: [PATCH 4.14 06/15] base: core: Remove WARN_ON from link dependencies check

From: Benjamin Gaignard <benjamin.gaignard@...aro.org>

commit e16f4f3e0b7daecd48d4f944ab4147c1a6cb16a8 upstream

In some cases the link between between customer and supplier
already exist, for example when a device use its parent as a supplier.
Do not warn about already existing dependencies because device_link_add()
takes care of this case.

Link: http://lkml.kernel.org/r/20180709111753eucas1p1f32e66fb2f7ea3216097cd72a132355d~-rzycA5Rg0378203782eucas1p1C@eucas1p1.samsung.com

Reported-by: Marek Szyprowski <m.szyprowski@...sung.com>
Reviewed-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...com>
Reviewed-by: Rafael J. Wysocki <rafael@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/base/core.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -109,7 +109,7 @@ static int device_is_dependent(struct de
 	struct device_link *link;
 	int ret;
 
-	if (WARN_ON(dev == target))
+	if (dev == target)
 		return 1;
 
 	ret = device_for_each_child(dev, target, device_is_dependent);
@@ -117,7 +117,7 @@ static int device_is_dependent(struct de
 		return ret;
 
 	list_for_each_entry(link, &dev->links.consumers, s_node) {
-		if (WARN_ON(link->consumer == target))
+		if (link->consumer == target)
 			return 1;
 
 		ret = device_is_dependent(link->consumer, target);