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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>
This commit is contained in:
Sonic Zhang 2012-06-13 16:22:42 +08:00 committed by Wolfram Sang
parent a20a64d226
commit a25733d6f6
1 changed files with 4 additions and 4 deletions
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8
drivers/i2c/busses/i2c-bfin-twi.c
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@ -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;