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| author | Sonic Zhang <sonic.zhang@analog.com> | 2012-06-13 16:22:42 +0800 |
|---|---|---|
| committer | Wolfram Sang <w.sang@pengutronix.de> | 2012-07-13 08:27:31 +0200 |
| commit | a25733d6f6968240042ac94dc93c7ae3c9e8d68b (patch) | |
| tree | 3db858d155f0cd052613d963f2f96102c1470c6e /drivers/i2c/busses | |
| parent | a20a64d226be36808b24d2205b5d35e80c49e8be (diff) | |
| download | lwn-a25733d6f6968240042ac94dc93c7ae3c9e8d68b.tar.gz lwn-a25733d6f6968240042ac94dc93c7ae3c9e8d68b.zip | |
i2c: i2c-bfin-twi: Break dead waiting loop if i2c device misbehaves.
Some fault i2c device may hold the sda/scl line and cause i2c driver
wait in the BUS busy loop. The I2C framework already retry the
transfer loop before timeout. Return -EAGAIN instead of pull BUSBUSY
in the other loop.
Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Diffstat (limited to 'drivers/i2c/busses')
| -rw-r--r-- | drivers/i2c/busses/i2c-bfin-twi.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/i2c/busses/i2c-bfin-twi.c b/drivers/i2c/busses/i2c-bfin-twi.c index 4799c6886946..5fb5f3ee13a2 100644 --- a/drivers/i2c/busses/i2c-bfin-twi.c +++ b/drivers/i2c/busses/i2c-bfin-twi.c @@ -307,8 +307,8 @@ static int bfin_twi_do_master_xfer(struct i2c_adapter *adap, if (!(read_CONTROL(iface) & TWI_ENA)) return -ENXIO; - while (read_MASTER_STAT(iface) & BUSBUSY) - yield(); + if (read_MASTER_STAT(iface) & BUSBUSY) + return -EAGAIN; iface->pmsg = msgs; iface->msg_num = num; @@ -407,8 +407,8 @@ int bfin_twi_do_smbus_xfer(struct i2c_adapter *adap, u16 addr, if (!(read_CONTROL(iface) & TWI_ENA)) return -ENXIO; - while (read_MASTER_STAT(iface) & BUSBUSY) - yield(); + if (read_MASTER_STAT(iface) & BUSBUSY) + return -EAGAIN; iface->writeNum = 0; iface->readNum = 0; |