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 11:52:45 +0100
From: Bryan O'Donoghue <pure.logic@...us-software.ie>
To: Wolfram Sang <wsa+renesas@...g-engineering.com>, linux-i2c@...r.kernel.org
Cc: 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 27/04/2024 21:36, 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>
> ---
>   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) {
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>