From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bartosz Golaszewski Subject: [PATCH 14/28] net: split eth_platform_get_mac_address() into subroutines Date: Wed, 8 Aug 2018 17:31:36 +0200 Message-ID: <20180808153150.23444-15-brgl@bgdev.pl> References: <20180808153150.23444-1-brgl@bgdev.pl> Return-path: In-Reply-To: <20180808153150.23444-1-brgl@bgdev.pl> Sender: linux-kernel-owner@vger.kernel.org To: Jonathan Corbet , Sekhar Nori , Kevin Hilman , Russell King , Arnd Bergmann , Greg Kroah-Hartman , David Woodhouse , Brian Norris , Boris Brezillon , Marek Vasut , Richard Weinberger , Grygorii Strashko , "David S . Miller" , Srinivas Kandagatla , Naren , Mauro Carvalho Chehab , Andrew Morton , Lukas Wunner , Dan Carpenter Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-i2c@vger.kernel.org, linux-mtd@lists.infradead.org, linux-omap@vger.kernel.org, netdev@vger.kernel.org, Bartosz Golaszewski List-Id: linux-i2c@vger.kernel.org From: Bartosz Golaszewski We want do add more sources from which to read the MAC address. In order to avoid bloating this function too much, start by splitting it into subroutines, each of which takes care of reading the MAC from one source. Signed-off-by: Bartosz Golaszewski --- net/ethernet/eth.c | 48 +++++++++++++++++++++++++++++++++++----------- 1 file changed, 37 insertions(+), 11 deletions(-) diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c index ee28440f57c5..cf54cdf042b7 100644 --- a/net/ethernet/eth.c +++ b/net/ethernet/eth.c @@ -525,26 +525,52 @@ unsigned char * __weak arch_get_platform_mac_address(void) return NULL; } -int eth_platform_get_mac_address(struct device *dev, u8 *mac_addr) +static int mac_address_from_of(struct device *dev, u8 *mac_addr) { const unsigned char *addr; - struct device_node *dp; + struct device_node *np; - if (dev_is_pci(dev)) - dp = pci_device_to_OF_node(to_pci_dev(dev)); - else - dp = dev->of_node; + np = dev_is_pci(dev) ? pci_device_to_OF_node(to_pci_dev(dev)) + : dev->of_node; - addr = NULL; - if (dp) - addr = of_get_mac_address(dp); - if (!addr) - addr = arch_get_platform_mac_address(); + if (!np) + return -ENODEV; + addr = of_get_mac_address(np); if (!addr) return -ENODEV; + if (!addr || !is_valid_ether_addr(addr)) + return -ENODEV; + + ether_addr_copy(mac_addr, addr); + return 0; +} + +static int mac_address_from_arch(u8 *mac_addr) +{ + const unsigned char *addr; + + addr = arch_get_platform_mac_address(); + if (!addr || !is_valid_ether_addr(addr)) + return -ENODEV; + ether_addr_copy(mac_addr, addr); return 0; } + +int eth_platform_get_mac_address(struct device *dev, u8 *mac_addr) +{ + int rv; + + rv = mac_address_from_of(dev, mac_addr); + if (!rv) + return 0; + + rv = mac_address_from_arch(mac_addr); + if (!rv) + return 0; + + return -ENODEV; +} EXPORT_SYMBOL(eth_platform_get_mac_address); -- 2.18.0