linux-kernel - Re: [PATCH] staging: axis-fifo: initialize timeouts in probe only

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Date:   Tue, 14 Mar 2023 13:43:40 -0700
From:   Alison Schofield <alison.schofield@...el.com>
To:     Khadija Kamran <kamrankhadijadj@...il.com>
Cc:     outreachy@...ts.linux.dev,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: axis-fifo: initialize timeouts in probe only

On Mon, Mar 13, 2023 at 11:07:10PM +0500, Khadija Kamran wrote:
> Module parameter, read_timeout, can only be set at the loading time. As
> it can only be modified once, initialize read_timeout once in the probe
> function.
> As a result, only use read_timeout as the last argument in
> wait_event_interruptible_timeout() call.
> 
> Same goes for write_timeout.
> 
> Suggested-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Signed-off-by: Khadija Kamran <kamrankhadijadj@...il.com>
> ---

Looks like this is [PATCH v5] and needs a changelog.


>  drivers/staging/axis-fifo/axis-fifo.c | 18 ++++++++++++------
>  1 file changed, 12 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/staging/axis-fifo/axis-fifo.c b/drivers/staging/axis-fifo/axis-fifo.c
> index dfd2b357f484..563caf155713 100644
> --- a/drivers/staging/axis-fifo/axis-fifo.c
> +++ b/drivers/staging/axis-fifo/axis-fifo.c
> @@ -384,9 +384,7 @@ static ssize_t axis_fifo_read(struct file *f, char __user *buf,
>  		mutex_lock(&fifo->read_lock);
>  		ret = wait_event_interruptible_timeout(fifo->read_queue,
>  			ioread32(fifo->base_addr + XLLF_RDFO_OFFSET),
> -				 (read_timeout >= 0) ?
> -				  msecs_to_jiffies(read_timeout) :
> -				  MAX_SCHEDULE_TIMEOUT);
> +			read_timeout);
>  
>  		if (ret <= 0) {
>  			if (ret == 0) {
> @@ -528,9 +526,7 @@ static ssize_t axis_fifo_write(struct file *f, const char __user *buf,
>  		ret = wait_event_interruptible_timeout(fifo->write_queue,
>  			ioread32(fifo->base_addr + XLLF_TDFV_OFFSET)
>  				 >= words_to_write,
> -				 (write_timeout >= 0) ?
> -				  msecs_to_jiffies(write_timeout) :
> -				  MAX_SCHEDULE_TIMEOUT);
> +			write_timeout);
>  
>  		if (ret <= 0) {
>  			if (ret == 0) {
> @@ -815,6 +811,16 @@ static int axis_fifo_probe(struct platform_device *pdev)
>  	char *device_name;
>  	int rc = 0; /* error return value */
>  
> +	if (read_timeout >= 0)
> +		read_timeout = msecs_to_jiffies(read_timeout);
> +	else
> +		read_timeout = MAX_SCHEDULE_TIMEOUT;
> +
> +	if (write_timeout >= 0)
> +		write_timeout = msecs_to_jiffies(write_timeout);
> +	else
> +		write_timeout = MAX_SCHEDULE_TIMEOUT;
> +
>  	/* ----------------------------
>  	 *     init wrapper device
>  	 * ----------------------------
> -- 
> 2.34.1
> 
>