This patch removes this unneeded mutex. Indeed it was used
to serialized access to the hardware, but this is already
done by the i2c-core layer, see 'bus_lock' mutex used by
i2c_transfer().
Signed-off-by: Francis Moreau <[EMAIL PROTECTED]>
Acked-by: Bryan Wu <[EMAIL PROTECTED]>
Acked-by: Sonic Zhang <[EMAIL PROTECTED]>
---
drivers/i2c/busses/i2c-bfin-twi.c | 16 ----------------
1 files changed, 0 insertions(+), 16 deletions(-)
diff --git a/drivers/i2c/busses/i2c-bfin-twi.c
b/drivers/i2c/busses/i2c-bfin-twi.c
index 6311039..67224a4 100644
--- a/drivers/i2c/busses/i2c-bfin-twi.c
+++ b/drivers/i2c/busses/i2c-bfin-twi.c
@@ -44,7 +44,6 @@
#define TWI_I2C_MODE_COMBINED 0x04
struct bfin_twi_iface {
- struct mutex twi_lock;
int irq;
spinlock_t lock;
char read_write;
@@ -228,12 +227,8 @@ static int bfin_twi_master_xfer(struct i2c_adapter *adap,
if (!(bfin_read_TWI_CONTROL() & TWI_ENA))
return -ENXIO;
- mutex_lock(&iface->twi_lock);
-
while (bfin_read_TWI_MASTER_STAT() & BUSBUSY) {
- mutex_unlock(&iface->twi_lock);
yield();
- mutex_lock(&iface->twi_lock);
}
ret = 0;
@@ -310,9 +305,6 @@ static int bfin_twi_master_xfer(struct i2c_adapter *adap,
break;
}
- /* Release mutex */
- mutex_unlock(&iface->twi_lock);
-
return ret;
}
@@ -330,12 +322,8 @@ int bfin_twi_smbus_xfer(struct i2c_adapter *adap, u16 addr,
if (!(bfin_read_TWI_CONTROL() & TWI_ENA))
return -ENXIO;
- mutex_lock(&iface->twi_lock);
-
while (bfin_read_TWI_MASTER_STAT() & BUSBUSY) {
- mutex_unlock(&iface->twi_lock);
yield();
- mutex_lock(&iface->twi_lock);
}
iface->writeNum = 0;
@@ -502,9 +490,6 @@ int bfin_twi_smbus_xfer(struct i2c_adapter *adap, u16 addr,
rc = (iface->result >= 0) ? 0 : -1;
- /* Release mutex */
- mutex_unlock(&iface->twi_lock);
-
return rc;
}
@@ -555,7 +540,6 @@ static int i2c_bfin_twi_probe(struct platform_device *dev)
struct i2c_adapter *p_adap;
int rc;
- mutex_init(&(iface->twi_lock));
spin_lock_init(&(iface->lock));
init_completion(&(iface->complete));
iface->irq = IRQ_TWI;
-
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