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i2c: sh_mobile: eliminate an open-coded "goto" loop

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Eliminate an open-coded "goto" loop by introducing a function.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Wolfram Sang <wolfram@the-dreams.de>
This commit is contained in:
Guennadi Liakhovetski 2013-01-17 10:45:56 +01:00 committed by Wolfram Sang
parent 5687265b31
commit 4b3823184f
1 changed files with 34 additions and 26 deletions
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60
drivers/i2c/busses/i2c-sh_mobile.c
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@ -495,6 +495,37 @@ static int start_ch(struct sh_mobile_i2c_data *pd, struct i2c_msg *usr_msg)
return 0;
}
static int poll_busy(struct sh_mobile_i2c_data *pd)
{
int i;
for (i = 1000; i; i--) {
u_int8_t val = iic_rd(pd, ICSR);
dev_dbg(pd->dev, "val 0x%02x pd->sr 0x%02x\n", val, pd->sr);
/* the interrupt handler may wake us up before the
* transfer is finished, so poll the hardware
* until we're done.
*/
if (!(val & ICSR_BUSY)) {
/* handle missing acknowledge and arbitration lost */
if ((val | pd->sr) & (ICSR_TACK | ICSR_AL))
return -EIO;
break;
}
udelay(10);
}
if (!i) {
dev_err(pd->dev, "Polling timed out\n");
return -ETIMEDOUT;
}
return 0;
}
static int sh_mobile_i2c_xfer(struct i2c_adapter *adapter,
struct i2c_msg *msgs,
int num)
@ -502,8 +533,7 @@ static int sh_mobile_i2c_xfer(struct i2c_adapter *adapter,
struct sh_mobile_i2c_data *pd = i2c_get_adapdata(adapter);
struct i2c_msg *msg;
int err = 0;
u_int8_t val;
int i, k, retry_count;
int i, k;
activate_ch(pd);
@ -527,31 +557,9 @@ static int sh_mobile_i2c_xfer(struct i2c_adapter *adapter,
break;
}
retry_count = 1000;
again:
val = iic_rd(pd, ICSR);
dev_dbg(pd->dev, "val 0x%02x pd->sr 0x%02x\n", val, pd->sr);
/* the interrupt handler may wake us up before the
* transfer is finished, so poll the hardware
* until we're done.
*/
if (val & ICSR_BUSY) {
udelay(10);
if (retry_count--)
goto again;
err = -EIO;
dev_err(pd->dev, "Polling timed out\n");
err = poll_busy(pd);
if (err < 0)
break;
}
/* handle missing acknowledge and arbitration lost */
if ((val | pd->sr) & (ICSR_TACK | ICSR_AL)) {
err = -EIO;
break;
}
}
deactivate_ch(pd);