[PATCH v2 2/7] i2c: omap: reorder exit path of omap_i2c_xfer_msg()

[Felipe Balbi]

Hi,

On Thu, Oct 25, 2012 at 06:12:00PM +0530, Santosh Shilimkar wrote:
> On Thursday 25 October 2012 05:55 PM, Felipe Balbi wrote:
> >just a cleanup patch trying to make exit path
> >more straightforward. No changes otherwise.
> >
> >Signed-off-by: Felipe Balbi <balbi at ti.com>
> >---
> >  drivers/i2c/busses/i2c-omap.c | 26 +++++++++++++++++---------
> >  1 file changed, 17 insertions(+), 9 deletions(-)
> >
> >diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
> >index c07d9c4..bea0277 100644
> >--- a/drivers/i2c/busses/i2c-omap.c
> >+++ b/drivers/i2c/busses/i2c-omap.c
> >@@ -505,6 +505,7 @@ static int omap_i2c_xfer_msg(struct i2c_adapter *adap,
> >  {
> >  	struct omap_i2c_dev *dev = i2c_get_adapdata(adap);
> >  	unsigned long timeout;
> >+	int ret;
> You might want to initialize the error value to avoid return 0. Compiler
> might be already cribbing for it
> 
> >  	u16 w;
> >
> >  	dev_dbg(dev->dev, "addr: 0x%04x, len: %d, flags: 0x%x, stop: %d\n",
> >@@ -582,31 +583,38 @@ static int omap_i2c_xfer_msg(struct i2c_adapter *adap,
> >  	dev->buf_len = 0;
> >  	if (timeout == 0) {
> >  		dev_err(dev->dev, "controller timed out\n");
> >-		omap_i2c_init(dev);
> >-		return -ETIMEDOUT;
> >+		ret = -ETIMEDOUT;
> >+		goto err_i2c_init;
> >  	}
> >
> >-	if (likely(!dev->cmd_err))
> >-		return 0;
> >-
> Have you have drooped this check completely ?

yes, the idea is to have a single exit point, so all checks below would
be executed.

> >  	/* We have an error */
> >  	if (dev->cmd_err & (OMAP_I2C_STAT_AL | OMAP_I2C_STAT_ROVR |
> >  			    OMAP_I2C_STAT_XUDF)) {
> >-		omap_i2c_init(dev);
> >-		return -EIO;
> >+		ret = -EIO;
> >+		goto err_i2c_init;
> >  	}
> >
> >  	if (dev->cmd_err & OMAP_I2C_STAT_NACK) {
> >  		if (msg->flags & I2C_M_IGNORE_NAK)
> >  			return 0;
> >+
> >  		if (stop) {
> >  			w = omap_i2c_read_reg(dev, OMAP_I2C_CON_REG);
> >  			w |= OMAP_I2C_CON_STP;
> >  			omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w);
> >  		}
> >-		return -EREMOTEIO;
> >+
> >+		ret = -EREMOTEIO;
> >+		goto err;
> >  	}
> >-	return -EIO;
> >+
> >+	return 0;
> With initialized value you can use
> return ret;

hmm, I guess I did that on a follow up patch where I grouped the stop
handling.

-- 
balbi
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