linux-kernel - Re: [PATCH 12/15] i2c: qcom-geni: use 'time_left' variable with wait_for_completion

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Date: Mon, 29 Apr 2024 19:10:30 -0700
From: Bjorn Andersson <quic_bjorande@...cinc.com>
To: Wolfram Sang <wsa+renesas@...g-engineering.com>
CC: <linux-i2c@...r.kernel.org>, Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Andi Shyti <andi.shyti@...nel.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 12/15] i2c: qcom-geni: use 'time_left' variable with
 wait_for_completion_timeout()

On Sat, Apr 27, 2024 at 10:36:04PM +0200, Wolfram Sang wrote:
> There is a confusing pattern in the kernel to use a variable named 'timeout' to
> store the result of wait_for_completion_timeout() causing patterns like:
> 
> 	timeout = wait_for_completion_timeout(...)
> 	if (!timeout) return -ETIMEDOUT;
> 
> with all kinds of permutations. Use 'time_left' as a variable to make the code
> self explaining.
> 
> Fix to the proper variable type 'unsigned long' while here.
> 
> Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>

Reviewed-by: Bjorn Andersson <quic_bjorande@...cinc.com>

Regards,
Bjorn

> ---
>  drivers/i2c/busses/i2c-qcom-geni.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-qcom-geni.c b/drivers/i2c/busses/i2c-qcom-geni.c
> index 090b4846ed62..0a8b95ce35f7 100644
> --- a/drivers/i2c/busses/i2c-qcom-geni.c
> +++ b/drivers/i2c/busses/i2c-qcom-geni.c
> @@ -586,7 +586,8 @@ static int geni_i2c_gpi_xfer(struct geni_i2c_dev *gi2c, struct i2c_msg msgs[], i
>  {
>  	struct dma_slave_config config = {};
>  	struct gpi_i2c_config peripheral = {};
> -	int i, ret = 0, timeout;
> +	int i, ret = 0;
> +	unsigned long time_left;
>  	dma_addr_t tx_addr, rx_addr;
>  	void *tx_buf = NULL, *rx_buf = NULL;
>  	const struct geni_i2c_clk_fld *itr = gi2c->clk_fld;
> @@ -629,8 +630,8 @@ static int geni_i2c_gpi_xfer(struct geni_i2c_dev *gi2c, struct i2c_msg msgs[], i
>  
>  		dma_async_issue_pending(gi2c->tx_c);
>  
> -		timeout = wait_for_completion_timeout(&gi2c->done, XFER_TIMEOUT);
> -		if (!timeout)
> +		time_left = wait_for_completion_timeout(&gi2c->done, XFER_TIMEOUT);
> +		if (!time_left)
>  			gi2c->err = -ETIMEDOUT;
>  
>  		if (gi2c->err) {
> -- 
> 2.43.0
>