[yocto] [PATCH 1/1] pch_gbe: Do not abort probe on bad MAC

[Darren Hart]

commit: 2b53d07891630dead46d65c8f896955fd3ae0302 (linux-stable)

If the MAC is invalid or not implemented, do not abort the probe. Issue
a warning and prevent bringing the interface up until a MAC is set manually
(via ifconfig $IFACE hw ether $MAC).

Tested on two platforms, one with a valid MAC, the other without a MAC. The real
MAC is used if present, the interface fails to come up until the MAC is set on
the other. They successfully get an IP over DHCP and pass a simple ping and
login over ssh test.

This is meant to allow the Inforce SYS940X development board:
http://www.inforcecomputing.com/SYS940X_ECX.html
(and others suffering from a missing MAC) to work with the mainline kernel.
Without this patch, the probe will fail and the interface will not be created,
preventing the user from configuring the MAC manually.

This does not make any attempt to address a missing or invalid MAC for the
pch_phub driver.

Signed-off-by: Darren Hart <dvhart at linux.intel.com>
CC: Arjan van de Ven <arjan at linux.intel.com>
CC: Alan Cox <alan at linux.intel.com>
CC: Tomoya MORINAGA <tomoya.rohm at gmail.com>
CC: Jeff Kirsher <jeffrey.t.kirsher at intel.com>
CC: "David S. Miller" <davem at davemloft.net>
CC: Paul Gortmaker <paul.gortmaker at windriver.com>
CC: Jon Mason <jdmason at kudzu.us>
CC: netdev at vger.kernel.org
CC: Mark Brown <broonie at opensource.wolfsonmicro.com>
CC: David Laight <David.Laight at ACULAB.COM>
CC: Joe Perches <joe at perches.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
---
 .../net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c   |   17 ++++++++++++++---
 1 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
index 48406ca..43c7b25 100644
--- a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
+++ b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
@@ -1745,6 +1745,12 @@ int pch_gbe_up(struct pch_gbe_adapter *adapter)
 	struct pch_gbe_rx_ring *rx_ring = adapter->rx_ring;
 	int err;
 
+	/* Ensure we have a valid MAC */
+	if (!is_valid_ether_addr(adapter->hw.mac.addr)) {
+		pr_err("Error: Invalid MAC address\n");
+		return -EINVAL;
+	}
+
 	/* hardware has been reset, we need to reload some things */
 	pch_gbe_set_multi(netdev);
 
@@ -2467,9 +2473,14 @@ static int pch_gbe_probe(struct pci_dev *pdev,
 
 	memcpy(netdev->dev_addr, adapter->hw.mac.addr, netdev->addr_len);
 	if (!is_valid_ether_addr(netdev->dev_addr)) {
-		dev_err(&pdev->dev, "Invalid MAC Address\n");
-		ret = -EIO;
-		goto err_free_adapter;
+		/*
+		 * If the MAC is invalid (or just missing), display a warning
+		 * but do not abort setting up the device. pch_gbe_up will
+		 * prevent the interface from being brought up until a valid MAC
+		 * is set.
+		 */
+		dev_err(&pdev->dev, "Invalid MAC address, "
+		                    "interface disabled.\n");
 	}
 	setup_timer(&adapter->watchdog_timer, pch_gbe_watchdog,
 		    (unsigned long)adapter);
-- 
1.7.7.6