From 7a3e133751870a3431e2430386a77a002eb24117 Mon Sep 17 00:00:00 2001 From: "Daniel F. Dickinson" Date: Thu, 26 Jul 2018 02:57:37 -0400 Subject: [PATCH] ar71xx: ag71xx: Prevent kernel oops for board def The driver is written in such a way that with a board defintion that connects a fixed phy, mdio, and switch in a certain way, a kernel oops could result because of lack of previously probed mdio bus. This commit allows for easier debugging in this case by casting the correct blame with serial console messages. Signed-off-by: Daniel F. Dickinson --- .../net/ethernet/atheros/ag71xx/ag71xx_phy.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_phy.c b/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_phy.c index 1683fce882..58db559ecf 100644 --- a/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_phy.c +++ b/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_phy.c @@ -76,10 +76,24 @@ void ag71xx_phy_stop(struct ag71xx *ag) static int ag71xx_phy_connect_fixed(struct ag71xx *ag) { - struct device *dev = &ag->pdev->dev; + struct platform_device *pdev = ag->pdev; + struct device *dev = NULL; struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag); int ret = 0; + if (!pdev) + return -ENODEV; + + dev = &pdev->dev; + + if (!dev) + return -ENODEV; + + if (!ag->phy_dev) { + pr_err("Missing PHY for %s", dev_name(dev)); + return -ENODEV; + } + /* use fixed settings */ switch (pdata->speed) { case SPEED_10: