linux-kernel - Re: [PATCH] i2c: tegra: remove warning dump if timeout happen in transfer

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Date:	Fri, 15 Feb 2013 18:31:07 +0530
From:	Shubhrajyoti Datta <omaplinuxkernel@...il.com>
To:	Laxman Dewangan <ldewangan@...dia.com>
Cc:	wsa@...-dreams.de, swarren@...dia.com, khali@...ux-fr.org,
	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-tegra@...r.kernel.org
Subject: Re: [PATCH] i2c: tegra: remove warning dump if timeout happen in transfer

On Thu, Feb 14, 2013 at 6:13 PM, Laxman Dewangan <ldewangan@...dia.com> wrote:
> If timeout error occurs in the i2c transfer then it was dumping warning
> of call stack.
>
> Remove the warning dump as there is may be possibility that some slave
> devices are busy and not responding the i2c communication.
>
> Signed-off-by: Laxman Dewangan <ldewangan@...dia.com>
> ---
> The patch is generated based on discussion happen between Stephena and
> Wolfram on the patch:
>  i2c: add bcm2835 driver
>
> resending patch as Wolfram's email id has been changed.
>
>  drivers/i2c/busses/i2c-tegra.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
> index ae2e027..36704e3 100644
> --- a/drivers/i2c/busses/i2c-tegra.c
> +++ b/drivers/i2c/busses/i2c-tegra.c
> @@ -587,7 +587,7 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev,
>         ret = wait_for_completion_timeout(&i2c_dev->msg_complete, TEGRA_I2C_TIMEOUT);
>         tegra_i2c_mask_irq(i2c_dev, int_mask);
>
> -       if (WARN_ON(ret == 0)) {
> +       if (ret == 0) {

I think WARN_ON has a unlikely.

If you could do a profiling and have the unlikely.

BTW thats not an objection to the patch though.

>                 dev_err(i2c_dev->dev, "i2c transfer timed out\n");
>
>                 tegra_i2c_init(i2c_dev);
> --
> 1.7.1.1
>
> --
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