linux-kernel - Re: [PATCH 3/4] staging: kpc2000: add missing spaces in core.c

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Date:   Mon, 27 May 2019 10:31:59 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Simon Sandström <simon@...anor.nu>
Cc:     gregkh@...uxfoundation.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] staging: kpc2000: add missing spaces in core.c

On Fri, May 24, 2019 at 01:08:01PM +0200, Simon Sandström wrote:
> Fixes checkpatch.pl errors "space required before the open brace '{'"
> and "(foo*)" should be "(foo *)".
> 
> Signed-off-by: Simon Sandström <simon@...anor.nu>
> ---
>  drivers/staging/kpc2000/kpc2000/core.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/staging/kpc2000/kpc2000/core.c b/drivers/staging/kpc2000/kpc2000/core.c
> index 40f65f96986b..bb3b427a72b1 100644
> --- a/drivers/staging/kpc2000/kpc2000/core.c
> +++ b/drivers/staging/kpc2000/kpc2000/core.c
> @@ -308,7 +308,7 @@ static long kp2000_cdev_ioctl(struct file *filp, unsigned int ioctl_num,
>  
>  	dev_dbg(&pcard->pdev->dev, "kp2000_cdev_ioctl(filp = [%p], ioctl_num = 0x%08x, ioctl_param = 0x%016lx) pcard = [%p]\n", filp, ioctl_num, ioctl_param, pcard);
>  
> -	switch (ioctl_num){
> +	switch (ioctl_num) {
>  	case KP2000_IOCTL_GET_CPLD_REG:             return readq(pcard->sysinfo_regs_base + REG_CPLD_CONFIG);
>  	case KP2000_IOCTL_GET_PCIE_ERROR_REG:       return readq(pcard->sysinfo_regs_base + REG_PCIE_ERROR_COUNT);
>  
> @@ -326,7 +326,7 @@ static long kp2000_cdev_ioctl(struct file *filp, unsigned int ioctl_num,
>  		temp.ddna = pcard->ddna;
>  		temp.cpld_reg = readq(pcard->sysinfo_regs_base + REG_CPLD_CONFIG);
>  
> -		ret = copy_to_user((void*)ioctl_param, (void*)&temp, sizeof(temp));
> +		ret = copy_to_user((void *)ioctl_param, (void *)&temp, sizeof(temp));
>  		if (ret)
>  			return -EFAULT;

This should really be written like so:

		if (copy_to_user((void __user *)ioctl_param, &temp,
				 sizeof(temp)))
			return -EFAULT;

temp is really the wrong name.  "temp" is for temperatures.  "tmp" means
temporary.  But also "tmp" is wrong here because it's not a temporary
variable.  It's better to call it "regs" here.

regards,
dan carpenter