From 882119ff969da4ec308d1161c78d22bc9b4a1f01 Mon Sep 17 00:00:00 2001 From: Kurt Kanzenbach Date: Sun, 19 May 2019 19:59:36 +0200 Subject: [PATCH 1/2] 1/2] net: axienet: use readx_poll_timeout() in mdio wait function On loaded systems with a preemptible kernel the mdio_wait() function may report an error while everything is working fine: axienet_mdio_wait_until_ready(): axienet_ior() -> chip not ready --> interrupt here (other work for some time / chip become ready) if (time_before_eq(end, jiffies)) --> false positive error report Replace the current code with readx_poll_timeout() which take care of the situation. Signed-off-by: Kurt Kanzenbach Signed-off-by: Benedikt Spranger Signed-off-by: David S. Miller --- drivers/net/ethernet/xilinx/xilinx_axienet.h | 5 +++++ .../net/ethernet/xilinx/xilinx_axienet_mdio.c | 16 ++++++---------- 2 files changed, 11 insertions(+), 10 deletions(-) diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet.h b/drivers/net/ethernet/xilinx/xilinx_axienet.h index c337400485da..011adae32b89 100644 --- a/drivers/net/ethernet/xilinx/xilinx_axienet.h +++ b/drivers/net/ethernet/xilinx/xilinx_axienet.h @@ -484,6 +484,11 @@ static inline u32 axienet_ior(struct axienet_local *lp, off_t offset) return in_be32(lp->regs + offset); } +static inline u32 axinet_ior_read_mcr(struct axienet_local *lp) +{ + return axienet_ior(lp, XAE_MDIO_MCR_OFFSET); +} + /** * axienet_iow - Memory mapped Axi Ethernet register write * @lp: Pointer to axienet local structure diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet_mdio.c b/drivers/net/ethernet/xilinx/xilinx_axienet_mdio.c index 757a3b37ae8a..704babdbc8a2 100644 --- a/drivers/net/ethernet/xilinx/xilinx_axienet_mdio.c +++ b/drivers/net/ethernet/xilinx/xilinx_axienet_mdio.c @@ -11,6 +11,7 @@ #include #include #include +#include #include "xilinx_axienet.h" @@ -20,16 +21,11 @@ /* Wait till MDIO interface is ready to accept a new transaction.*/ int axienet_mdio_wait_until_ready(struct axienet_local *lp) { - unsigned long end = jiffies + 2; - while (!(axienet_ior(lp, XAE_MDIO_MCR_OFFSET) & - XAE_MDIO_MCR_READY_MASK)) { - if (time_before_eq(end, jiffies)) { - WARN_ON(1); - return -ETIMEDOUT; - } - udelay(1); - } - return 0; + u32 val; + + return readx_poll_timeout(axinet_ior_read_mcr, lp, + val, val & XAE_MDIO_MCR_READY_MASK, + 1, 20000); } /** From 563ecb8a3ccf041bb00d3404dee77c7f50c60039 Mon Sep 17 00:00:00 2001 From: Kurt Kanzenbach Date: Sun, 19 May 2019 19:59:37 +0200 Subject: [PATCH 2/2] 2/2] net: xilinx_emaclite: use readx_poll_timeout() in mdio wait function On loaded systems with a preemptible kernel the mdio_wait() function may report an error while everything is working fine: xemaclite_mdio_wait(): xemaclite_readl() -> chip not ready --> interrupt here (other work for some time / chip become ready) if (time_before_eq(end, jiffies)) --> false positive error report Replace the current code with readx_poll_timeout() which takes care of the situation. Signed-off-by: Kurt Kanzenbach Signed-off-by: Benedikt Spranger Signed-off-by: David S. Miller --- drivers/net/ethernet/xilinx/xilinx_emaclite.c | 16 ++++++---------- 1 file changed, 6 insertions(+), 10 deletions(-) diff --git a/drivers/net/ethernet/xilinx/xilinx_emaclite.c b/drivers/net/ethernet/xilinx/xilinx_emaclite.c index 6886270da695..c409bab63bd3 100644 --- a/drivers/net/ethernet/xilinx/xilinx_emaclite.c +++ b/drivers/net/ethernet/xilinx/xilinx_emaclite.c @@ -27,6 +27,7 @@ #include #include #include +#include #define DRIVER_NAME "xilinx_emaclite" @@ -714,20 +715,15 @@ static irqreturn_t xemaclite_interrupt(int irq, void *dev_id) static int xemaclite_mdio_wait(struct net_local *lp) { - unsigned long end = jiffies + 2; + u32 val; /* wait for the MDIO interface to not be busy or timeout * after some time. */ - while (xemaclite_readl(lp->base_addr + XEL_MDIOCTRL_OFFSET) & - XEL_MDIOCTRL_MDIOSTS_MASK) { - if (time_before_eq(end, jiffies)) { - WARN_ON(1); - return -ETIMEDOUT; - } - msleep(1); - } - return 0; + return readx_poll_timeout(xemaclite_readl, + lp->base_addr + XEL_MDIOCTRL_OFFSET, + val, !(val & XEL_MDIOCTRL_MDIOSTS_MASK), + 1000, 20000); } /**