From 84ce4d0f9f55b4f4ca4d4edcbb54a23d9dad1aae Mon Sep 17 00:00:00 2001 From: Martin Blumenstingl Date: Tue, 18 Jun 2019 22:39:27 +0200 Subject: [PATCH] net: stmmac: initialize the reset delay array Commit ce4ab73ab0c27c ("net: stmmac: drop the reset delays from struct stmmac_mdio_bus_data") moved the reset delay array from struct stmmac_mdio_bus_data to a stack variable. The values from the array inside struct stmmac_mdio_bus_data were previously initialized to 0 because the struct was allocated using devm_kzalloc(). The array on the stack has to be initialized explicitly, else we might be reading garbage values. Initialize all reset delays to 0 to ensure that the values are 0 if the "snps,reset-delays-us" property is not defined. This fixes booting at least two boards (MIPS pistachio marduk and ARM sun8i H2+ Orange Pi Zero). These are hanging during boot when initializing the stmmac Ethernet controller (as found by Kernel CI). Both have in common that they don't define the "snps,reset-delays-us" property. Fixes: ce4ab73ab0c27c ("net: stmmac: drop the reset delays from struct stmmac_mdio_bus_data") Signed-off-by: Martin Blumenstingl Reported-by: "kernelci.org bot" Signed-off-by: David S. Miller --- drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c index 5b7923c0698c..f8061e34122f 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c @@ -241,7 +241,7 @@ int stmmac_mdio_reset(struct mii_bus *bus) #ifdef CONFIG_OF if (priv->device->of_node) { struct gpio_desc *reset_gpio; - u32 delays[3]; + u32 delays[3] = { 0, 0, 0 }; int ret; reset_gpio = devm_gpiod_get_optional(priv->device, -- 2.30.2