linux-kernel - [PATCH 5.5 036/189] net: ethernet: dm9000: Handle -EPROBE_DEFER in dm9000_parse

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Message-Id: <20200310123643.131602714@linuxfoundation.org>
Date:   Tue, 10 Mar 2020 13:37:53 +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, "H. Nikolaus Schaller" <hns@...delico.com>,
        Mathieu Malaterre <malat@...ian.org>,
        Paul Cercueil <paul@...pouillou.net>,
        Andrew Lunn <andrew@...n.ch>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.5 036/189] net: ethernet: dm9000: Handle -EPROBE_DEFER in dm9000_parse_dt()

From: Paul Cercueil <paul@...pouillou.net>

[ Upstream commit 9a6a0dea16177ccaecc116f560232e63bec115f1 ]

The call to of_get_mac_address() can return -EPROBE_DEFER, for instance
when the MAC address is read from a NVMEM driver that did not probe yet.

Cc: H. Nikolaus Schaller <hns@...delico.com>
Cc: Mathieu Malaterre <malat@...ian.org>
Signed-off-by: Paul Cercueil <paul@...pouillou.net>
Reviewed-by: Andrew Lunn <andrew@...n.ch>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/davicom/dm9000.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/davicom/dm9000.c b/drivers/net/ethernet/davicom/dm9000.c
index cce90b5925d93..70060c51854fd 100644
--- a/drivers/net/ethernet/davicom/dm9000.c
+++ b/drivers/net/ethernet/davicom/dm9000.c
@@ -1405,6 +1405,8 @@ static struct dm9000_plat_data *dm9000_parse_dt(struct device *dev)
 	mac_addr = of_get_mac_address(np);
 	if (!IS_ERR(mac_addr))
 		ether_addr_copy(pdata->dev_addr, mac_addr);
+	else if (PTR_ERR(mac_addr) == -EPROBE_DEFER)
+		return ERR_CAST(mac_addr);
 
 	return pdata;
 }
-- 
2.20.1