netdev - [PATCH v2 net-next] net:dsa: check for EPROBE_DEFER from dsa_dst

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Message-Id: <1483611013-15013-1-git-send-email-volodymyr.bendiuga@gmail.com>
Date:   Thu,  5 Jan 2017 11:10:13 +0100
From:   Volodymyr Bendiuga <volodymyr.bendiuga@...il.com>
To:     andrew@...n.ch, vivien.didelot@...oirfairelinux.com,
        f.fainelli@...il.com, davem@...emloft.net, netdev@...r.kernel.org,
        volodymyr.bendiuga@...termo.se
Cc:     Volodymyr Bendiuga <volodymyr.bendiuga@...il.com>
Subject: [PATCH v2 net-next] net:dsa: check for EPROBE_DEFER from dsa_dst_parse()

Since there can be multiple dsa switches stacked together but
not all of devicetree nodes available at the time of calling
dsa_dst_parse(), EPROBE_DEFER can be returned by it. When this
happens, only the last dsa switch has to be deleted by
dsa_dst_del_ds(), but not the whole list, because next time linux
cames back to this function it will try to add only the last dsa
switch which returned EPROBE_DEFER.

Signed-off-by: Volodymyr Bendiuga <volodymyr.bendiuga@...il.com>
Reviewed-by: Andrew Lunn <andrew@...n.ch>
---
 net/dsa/dsa2.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
index 7924c92..a799718 100644
--- a/net/dsa/dsa2.c
+++ b/net/dsa/dsa2.c
@@ -673,8 +673,14 @@ static int _dsa_register_switch(struct dsa_switch *ds, struct device_node *np)
 	}
 
 	err = dsa_dst_parse(dst);
-	if (err)
+	if (err) {
+		if (err == -EPROBE_DEFER) {
+			dsa_dst_del_ds(dst, ds, ds->index);
+			return err;
+		}
+
 		goto out_del_dst;
+	}
 
 	err = dsa_dst_apply(dst);
 	if (err) {
-- 
2.7.4