linux-kernel - [PATCH net] net: sparx5: Fix reading of the MAC address

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Message-ID: <20230102121215.2697179-1-horatiu.vultur@microchip.com>
Date:   Mon, 2 Jan 2023 13:12:15 +0100
From:   Horatiu Vultur <horatiu.vultur@...rochip.com>
To:     <netdev@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
CC:     <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>, <lars.povlsen@...rochip.com>,
        <Steen.Hegelund@...rochip.com>, <daniel.machon@...rochip.com>,
        <UNGLinuxDriver@...rochip.com>, <casper.casan@...il.com>,
        <rmk+kernel@...linux.org.uk>, <linqiheng@...wei.com>,
        <nathan@...nel.org>, Horatiu Vultur <horatiu.vultur@...rochip.com>
Subject: [PATCH net] net: sparx5: Fix reading of the MAC address

There is an issue with the checking of the return value of
'of_get_mac_address', which returns 0 on success and negative value on
failure. The driver interpretated the result the opposite way. Therefore
if there was a MAC address defined in the DT, then the driver was
generating a random MAC address otherwise it would use address 0.
Fix this by checking correctly the return value of 'of_get_mac_address'

Fixes: b74ef9f9cb91 ("net: sparx5: Do not use mac_addr uninitialized in mchp_sparx5_probe()")
Signed-off-by: Horatiu Vultur <horatiu.vultur@...rochip.com>
---
 drivers/net/ethernet/microchip/sparx5/sparx5_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/microchip/sparx5/sparx5_main.c b/drivers/net/ethernet/microchip/sparx5/sparx5_main.c
index d25f4f09faa06..3c5d4fe993737 100644
--- a/drivers/net/ethernet/microchip/sparx5/sparx5_main.c
+++ b/drivers/net/ethernet/microchip/sparx5/sparx5_main.c
@@ -834,7 +834,7 @@ static int mchp_sparx5_probe(struct platform_device *pdev)
 	if (err)
 		goto cleanup_config;
 
-	if (!of_get_mac_address(np, sparx5->base_mac)) {
+	if (of_get_mac_address(np, sparx5->base_mac)) {
 		dev_info(sparx5->dev, "MAC addr was not set, use random MAC\n");
 		eth_random_addr(sparx5->base_mac);
 		sparx5->base_mac[5] = 0;
-- 
2.38.0