linux-kernel - [Patch v4 09/12] net: ethernet: xilinx: Generate random mac if none found

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Date:   Thu, 1 Sep 2016 17:51:02 +0100
From:   Zubair Lutfullah Kakakhel <Zubair.Kakakhel@...tec.com>
To:     <monstr@...str.eu>, <ralf@...ux-mips.org>, <tglx@...utronix.de>,
        <jason@...edaemon.net>, <marc.zyngier@....com>
CC:     <soren.brinkmann@...inx.com>, <Zubair.Kakakhel@...tec.com>,
        <linux-kernel@...r.kernel.org>, <linux-mips@...ux-mips.org>,
        <michal.simek@...inx.com>, <netdev@...r.kernel.org>
Subject: [Patch v4 09/12] net: ethernet: xilinx: Generate random mac if none found

At the moment, if the emaclite device doesn't find a mac address
from any source, it simply uses 0x0 with a warning printed.

Instead of using a 0x0 mac address, use a randomly generated one.

Signed-off-by: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@...tec.com>

---
V3 -> V4
Curly braces after if check for correct styling

V2 -> V3
No change

V1 -> V2
New patch
---
 drivers/net/ethernet/xilinx/xilinx_emaclite.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/xilinx/xilinx_emaclite.c b/drivers/net/ethernet/xilinx/xilinx_emaclite.c
index 3cee84a..efc8d2e 100644
--- a/drivers/net/ethernet/xilinx/xilinx_emaclite.c
+++ b/drivers/net/ethernet/xilinx/xilinx_emaclite.c
@@ -1131,11 +1131,13 @@ static int xemaclite_of_probe(struct platform_device *ofdev)
 	lp->rx_ping_pong = get_bool(ofdev, "xlnx,rx-ping-pong");
 	mac_address = of_get_mac_address(ofdev->dev.of_node);
 
-	if (mac_address)
+	if (mac_address) {
 		/* Set the MAC address. */
 		memcpy(ndev->dev_addr, mac_address, ETH_ALEN);
-	else
-		dev_warn(dev, "No MAC address found\n");
+	} else {
+		dev_warn(dev, "No MAC address found. Generating Random one\n");
+		eth_hw_addr_random(ndev);
+	}
 
 	/* Clear the Tx CSR's in case this is a restart */
 	__raw_writel(0, lp->base_addr + XEL_TSR_OFFSET);
-- 
1.9.1