From 946bc2509eb88ff0c64dd727a11c5a29b6bc2574 Mon Sep 17 00:00:00 2001 From: Vivien Didelot Date: Sat, 31 Aug 2019 16:18:27 -0400 Subject: [PATCH] net: dsa: mv88e6xxx: check errors in mv88e6352_serdes_irq_link The mv88e6352_serdes_irq_link helper is not checking for any error that may occur during hardware accesses. Worst, the "up" boolean is set from the potentially unused "status" variable, if read operations failed. As done in mv88e6390_serdes_irq_link_sgmii, return right away and do not call dsa_port_phylink_mac_change if an error occurred. Signed-off-by: Vivien Didelot Signed-off-by: David S. Miller --- drivers/net/dsa/mv88e6xxx/serdes.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/net/dsa/mv88e6xxx/serdes.c b/drivers/net/dsa/mv88e6xxx/serdes.c index 38c0da2492c0..7eb7ed68c91d 100644 --- a/drivers/net/dsa/mv88e6xxx/serdes.c +++ b/drivers/net/dsa/mv88e6xxx/serdes.c @@ -186,14 +186,19 @@ static void mv88e6352_serdes_irq_link(struct mv88e6xxx_chip *chip, int port) struct dsa_switch *ds = chip->ds; u16 status; bool up; + int err; - mv88e6352_serdes_read(chip, MII_BMSR, &status); + err = mv88e6352_serdes_read(chip, MII_BMSR, &status); + if (err) + return; /* Status must be read twice in order to give the current link * status. Otherwise the change in link status since the last * read of the register is returned. */ - mv88e6352_serdes_read(chip, MII_BMSR, &status); + err = mv88e6352_serdes_read(chip, MII_BMSR, &status); + if (err) + return; up = status & BMSR_LSTATUS; -- 2.30.2