linux-kernel - Re: [PATCH] i2c-davinci: Handle signals gracefully

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Message-ID: <20140324161432.GA7524@katana>
Date:	Mon, 24 Mar 2014 17:14:32 +0100
From:	Wolfram Sang <wsa@...-dreams.de>
To:	Mike Looijmans <mike.looijmans@...ic.nl>
Cc:	linux-i2c@...r.kernel.org,
	davinci-linux-open-source@...ux.davincidsp.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] i2c-davinci: Handle signals gracefully


> diff --git a/drivers/i2c/busses/i2c-davinci.c b/drivers/i2c/busses/i2c-davinci.c
> index af0b583..254d897 100644
> --- a/drivers/i2c/busses/i2c-davinci.c
> +++ b/drivers/i2c/busses/i2c-davinci.c
> @@ -372,9 +372,9 @@ i2c_davinci_xfer_msg(struct i2c_adapter *adap, struct i2c_msg *msg, int stop)
>  		flag |= DAVINCI_I2C_MDR_STP;
>  	davinci_i2c_write_reg(dev, DAVINCI_I2C_MDR_REG, flag);
>  
> -	r = wait_for_completion_interruptible_timeout(&dev->cmd_complete,
> +	r = wait_for_completion_timeout(&dev->cmd_complete,
>  						      dev->adapter.timeout);
> -	if (r == 0) {
> +	if (unlikely(r == 0)) {

Not really needed, but well yeah...

>  		dev_err(dev->dev, "controller timed out\n");
>  		davinci_i2c_recover_bus(dev);
>  		i2c_davinci_init(dev);
> @@ -384,7 +384,6 @@ i2c_davinci_xfer_msg(struct i2c_adapter *adap, struct i2c_msg *msg, int stop)
>  	if (dev->buf_len) {
>  		/* This should be 0 if all bytes were transferred
>  		 * or dev->cmd_err denotes an error.
> -		 * A signal may have aborted the transfer.
>  		 */
>  		if (r >= 0) {
>  			dev_err(dev->dev, "abnormal termination buf_len=%i\n",
> @@ -436,22 +435,24 @@ i2c_davinci_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
>  	ret = i2c_davinci_wait_bus_not_busy(dev, 1);
>  	if (ret < 0) {
>  		dev_warn(dev->dev, "timeout waiting for bus ready\n");
> -		return ret;
> +		goto error;

You are fixing the error path here to include the completion? This is a
seperate patch IMO.

>  	}
>  
>  	for (i = 0; i < num; i++) {
>  		ret = i2c_davinci_xfer_msg(adap, &msgs[i], (i == (num - 1)));
> -		dev_dbg(dev->dev, "%s [%d/%d] ret: %d\n", __func__, i + 1, num,
> -			ret);
> +		dev_dbg(dev->dev, "%s [%d/%d] %#x ret: %d\n", __func__, i + 1,
> +				num, msgs[i].addr, ret);

No need for this change. We have other debug output/tracing already. But
no need to clean up either.

>  		if (ret < 0)
> -			return ret;
> +			goto error;
>  	}
> +	ret = num;
>  
> +error:
>  #ifdef CONFIG_CPU_FREQ
>  	complete(&dev->xfr_complete);
>  #endif
>  
> -	return num;
> +	return ret;

Thanks,

   Wolfram


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