linux-kernel - Re: [PATCH 6/8] spi: sun4i: use 'time_left' variable with wait_for_completion

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Message-ID: <20240429131438.1f036341@donnerap.manchester.arm.com>
Date: Mon, 29 Apr 2024 13:14:38 +0100
From: Andre Przywara <andre.przywara@....com>
To: Wolfram Sang <wsa+renesas@...g-engineering.com>
Cc: linux-spi@...r.kernel.org, Mark Brown <broonie@...nel.org>, Chen-Yu Tsai
 <wens@...e.org>, Jernej Skrabec <jernej.skrabec@...il.com>, Samuel Holland
 <samuel@...lland.org>, linux-arm-kernel@...ts.infradead.org,
 linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/8] spi: sun4i: use 'time_left' variable with
 wait_for_completion_timeout()

On Mon, 29 Apr 2024 13:28:39 +0200
Wolfram Sang <wsa+renesas@...g-engineering.com> 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: Andre Przywara <andre.przywara@....com>

Cheers,
Andre

> ---
>  drivers/spi/spi-sun4i.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/spi/spi-sun4i.c b/drivers/spi/spi-sun4i.c
> index 11d8bd27b3e9..2ee6755b43f5 100644
> --- a/drivers/spi/spi-sun4i.c
> +++ b/drivers/spi/spi-sun4i.c
> @@ -206,7 +206,8 @@ static int sun4i_spi_transfer_one(struct spi_controller *host,
>  				  struct spi_transfer *tfr)
>  {
>  	struct sun4i_spi *sspi = spi_controller_get_devdata(host);
> -	unsigned int mclk_rate, div, timeout;
> +	unsigned int mclk_rate, div;
> +	unsigned long time_left;
>  	unsigned int start, end, tx_time;
>  	unsigned int tx_len = 0;
>  	int ret = 0;
> @@ -327,10 +328,10 @@ static int sun4i_spi_transfer_one(struct spi_controller *host,
>  
>  	tx_time = max(tfr->len * 8 * 2 / (tfr->speed_hz / 1000), 100U);
>  	start = jiffies;
> -	timeout = wait_for_completion_timeout(&sspi->done,
> -					      msecs_to_jiffies(tx_time));
> +	time_left = wait_for_completion_timeout(&sspi->done,
> +						msecs_to_jiffies(tx_time));
>  	end = jiffies;
> -	if (!timeout) {
> +	if (!time_left) {
>  		dev_warn(&host->dev,
>  			 "%s: timeout transferring %u bytes@...z for %i(%i)ms",
>  			 dev_name(&spi->dev), tfr->len, tfr->speed_hz,