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| author |   Andrew Lunn <andrew@lunn.ch> | 2016-08-19 00:01:55 +0200 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2016-08-19 17:14:07 -0700 |
| commit | 6441e6695acfce66499c186c591f319a3b125de7 (patch) | |
| tree | 6176d51df774454eb72af38c718cc4acb1f7f85b /drivers | |
| parent | Merge branch 'phy-next' (diff) | |
| download | linux-dev-6441e6695acfce66499c186c591f319a3b125de7.tar.xz linux-dev-6441e6695acfce66499c186c591f319a3b125de7.zip | |
dsa: mv88e6xxx: Timeout based on iterations, not time
The mv88e6xxx driver times out operations on the switch based on
looping until an elapsed wall clock time is reached. However, if
usleep_range() sleeps much longer than expected, it could timeout with
an error without actually checking to see if the devices has completed
the operation. So replace the elapsed time with a fixed upper bound on
the number of loops.
Testing on various switches has shown that switches takes either 0 or
1 iteration, so a maximum of 16 iterations is a safe limit.
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/dsa/mv88e6xxx/chip.c | 15 |
1 files changed, 6 insertions, 9 deletions
diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c index a230fcba5b64..ac8e9af4879f 100644 --- a/drivers/net/dsa/mv88e6xxx/chip.c +++ b/drivers/net/dsa/mv88e6xxx/chip.c @@ -309,9 +309,9 @@ static int mv88e6xxx_serdes_write(struct mv88e6xxx_chip *chip, int reg, u16 val) static int mv88e6xxx_wait(struct mv88e6xxx_chip *chip, int addr, int reg, u16 mask) { - unsigned long timeout = jiffies + HZ / 10; + int i; - while (time_before(jiffies, timeout)) { + for (i = 0; i < 16; i++) { u16 val; int err; @@ -375,7 +375,7 @@ static int _mv88e6xxx_reg_write(struct mv88e6xxx_chip *chip, int addr, static int mv88e6xxx_ppu_disable(struct mv88e6xxx_chip *chip) { int ret; - unsigned long timeout; + int i; ret = _mv88e6xxx_reg_read(chip, REG_GLOBAL, GLOBAL_CONTROL); if (ret < 0) @@ -386,8 +386,7 @@ static int mv88e6xxx_ppu_disable(struct mv88e6xxx_chip *chip) if (ret) return ret; - timeout = jiffies + 1 * HZ; - while (time_before(jiffies, timeout)) { + for (i = 0; i < 16; i++) { ret = _mv88e6xxx_reg_read(chip, REG_GLOBAL, GLOBAL_STATUS); if (ret < 0) return ret; @@ -403,8 +402,7 @@ static int mv88e6xxx_ppu_disable(struct mv88e6xxx_chip *chip) static int mv88e6xxx_ppu_enable(struct mv88e6xxx_chip *chip) { - int ret, err; - unsigned long timeout; + int ret, err, i; ret = _mv88e6xxx_reg_read(chip, REG_GLOBAL, GLOBAL_CONTROL); if (ret < 0) @@ -415,8 +413,7 @@ static int mv88e6xxx_ppu_enable(struct mv88e6xxx_chip *chip) if (err) return err; - timeout = jiffies + 1 * HZ; - while (time_before(jiffies, timeout)) { + for (i = 0; i < 16; i++) { ret = _mv88e6xxx_reg_read(chip, REG_GLOBAL, GLOBAL_STATUS); if (ret < 0) return ret; |