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Date:   Thu, 16 Apr 2020 13:58:38 -0700
In-Reply-To: <c48a3baef99f3d74e7904498c4054221ec384b36.camel@suse.de>
Message-Id: <20200416205838.161894-1-saravanak@google.com>
Mime-Version: 1.0
Subject: [PATCH v1] of: property: Don't retry device_link_add() upon failure
From:   Saravana Kannan <saravanak@google.com>
To:     Rob Herring <robh+dt@kernel.org>,
        Frank Rowand <frowand.list@gmail.com>
Cc:     Saravana Kannan <saravanak@google.com>,
        Nicolas Saenz Julienne <nsaenzjulienne@suse.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        kernel-team@android.com, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org
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Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

When of_link_to_phandle() was implemented initially, there was no way to
tell if device_link_add() was failing because the supplier device hasn't
been parsed yet, hasn't been added yet, the links were creating a cycle,
etc. Some of these were transient errors that'd go away at a later
point.

However, with the current set of improved checks, if device_link_add()
fails, it'll only be for permanent errors like cycles or out-of-memory
errors.

Also, with the addition of DL_FLAG_SYNC_STATE_ONLY flag [1] to device
links, all the valid dependency cycles due to "proxy" device links
(needed for correctness of sync_state() device callback) will never fail
device_link_add() due to cycles.

So, continuing to retry failing device links (by returning -EAGAIN) is
no longer useful. At worst, it prevents platforms from setting
fw_devlink=on (or better) because it prevents proper boot up. So, let's
not do that anymore.

[1] - https://lore.kernel.org/lkml/20191028220027.251605-1-saravanak@google.com/
Cc: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Saravana Kannan <saravanak@google.com>
---
 drivers/of/property.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/of/property.c b/drivers/of/property.c
index 252e4f600155..ee1bc267f975 100644
--- a/drivers/of/property.c
+++ b/drivers/of/property.c
@@ -1074,7 +1074,7 @@ static int of_link_to_phandle(struct device *dev, struct device_node *sup_np,
 		return -EAGAIN;
 	}
 	if (!device_link_add(dev, sup_dev, dl_flags))
-		ret = -EAGAIN;
+		ret = -EINVAL;
 	put_device(sup_dev);
 	return ret;
 }
-- 
2.26.1.301.g55bc3eb7cb9-goog