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authorFrancis Moreau <francis.moro@gmail.com>2007-10-13 23:56:31 +0200
committerJean Delvare <khali@hyperion.delvare>2007-10-13 23:56:31 +0200
commit567a244b8b431ee8399bb43c7e65df605bdd5458 (patch)
treeb5df403c110f241981a83399b36ad5b740781e64
parente07bc679fbf59f1bf569d443e286911319480e87 (diff)
downloadlinux-567a244b8b431ee8399bb43c7e65df605bdd5458.tar.gz
i2c-bfin-twi: Remove useless twi_lock mutex
Remove this unneeded mutex. Indeed it was used to serialize 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 <francis.moro@gmail.com> Acked-by: Bryan Wu <bryan.wu@analog.com> Signed-off-by: Jean Delvare <khali@linux-fr.org>
-rw-r--r--drivers/i2c/busses/i2c-bfin-twi.c16
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 6311039dfe6..67224a424ab 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;