From: Emilio López Date: Tue, 23 Jul 2013 01:09:18 +0000 (-0300) Subject: net: sun4i: fix timeout check X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=2bf420a7686e0fdd2fbf16d75e729b306744db0d;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git net: sun4i: fix timeout check The current timeout check is comparing two constant values, so it won't ever detect a timeout. This patch reworks the affected code a bit so it has a chance at detecting timeouts correctly. Signed-off-by: Emilio López Acked-by: Maxime Ripard Signed-off-by: David S. Miller --- diff --git a/drivers/net/phy/mdio-sun4i.c b/drivers/net/phy/mdio-sun4i.c index 61d3f4ebf52e..7f25e49ae37f 100644 --- a/drivers/net/phy/mdio-sun4i.c +++ b/drivers/net/phy/mdio-sun4i.c @@ -40,7 +40,7 @@ struct sun4i_mdio_data { static int sun4i_mdio_read(struct mii_bus *bus, int mii_id, int regnum) { struct sun4i_mdio_data *data = bus->priv; - unsigned long start_jiffies; + unsigned long timeout_jiffies; int value; /* issue the phy address and reg */ @@ -49,10 +49,9 @@ static int sun4i_mdio_read(struct mii_bus *bus, int mii_id, int regnum) writel(0x1, data->membase + EMAC_MAC_MCMD_REG); /* Wait read complete */ - start_jiffies = jiffies; + timeout_jiffies = jiffies + MDIO_TIMEOUT; while (readl(data->membase + EMAC_MAC_MIND_REG) & 0x1) { - if (time_after(start_jiffies, - start_jiffies + MDIO_TIMEOUT)) + if (time_is_before_jiffies(timeout_jiffies)) return -ETIMEDOUT; msleep(1); } @@ -69,7 +68,7 @@ static int sun4i_mdio_write(struct mii_bus *bus, int mii_id, int regnum, u16 value) { struct sun4i_mdio_data *data = bus->priv; - unsigned long start_jiffies; + unsigned long timeout_jiffies; /* issue the phy address and reg */ writel((mii_id << 8) | regnum, data->membase + EMAC_MAC_MADR_REG); @@ -77,10 +76,9 @@ static int sun4i_mdio_write(struct mii_bus *bus, int mii_id, int regnum, writel(0x1, data->membase + EMAC_MAC_MCMD_REG); /* Wait read complete */ - start_jiffies = jiffies; + timeout_jiffies = jiffies + MDIO_TIMEOUT; while (readl(data->membase + EMAC_MAC_MIND_REG) & 0x1) { - if (time_after(start_jiffies, - start_jiffies + MDIO_TIMEOUT)) + if (time_is_before_jiffies(timeout_jiffies)) return -ETIMEDOUT; msleep(1); }