linux-kernel - Re: [Outreachy kernel] [PATCH] Staging: dgnc: Clean up Macros

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Date:   Sun, 16 Oct 2016 15:30:57 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     Siddhi Dave <d.sandy5990@...il.com>
cc:     lidza.louina@...il.com, markh@...pro.net,
        gregkh@...uxfoundation.org, driverdev-devel@...uxdriverproject.org,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        outreachy-kernel@...glegroups.com
Subject: Re: [Outreachy kernel] [PATCH] Staging: dgnc: Clean up Macros



On Sun, 16 Oct 2016, Siddhi Dave wrote:

> Fix checkpatch warning: Macros with flow control statements should be avoided
>
> Because Macros with flow control statements (goto and return) are
> not very nice to read as any flow movement is unexpected.
>
> Signed-off-by: Siddhi Dave <d.sandy5990@...il.com>
> ---
>  drivers/staging/dgnc/dgnc_sysfs.c | 20 ++++++++++----------
>  1 file changed, 10 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/staging/dgnc/dgnc_sysfs.c b/drivers/staging/dgnc/dgnc_sysfs.c
> index 290bf6e..0767740 100644
> --- a/drivers/staging/dgnc/dgnc_sysfs.c
> +++ b/drivers/staging/dgnc/dgnc_sysfs.c
> @@ -90,16 +90,16 @@ void dgnc_remove_driver_sysfiles(struct pci_driver *dgnc_driver)
>  	driver_remove_file(driverfs, &driver_attr_pollrate);
>  }
>
> -#define DGNC_VERIFY_BOARD(p, bd)				\
> -	do {							\
> -		if (!p)						\
> -			return 0;				\
> -								\
> -		bd = dev_get_drvdata(p);			\
> -		if (!bd || bd->magic != DGNC_BOARD_MAGIC)	\
> -			return 0;				\
> -		if (bd->state != BOARD_READY)			\
> -			return 0;				\
> +#define DGNC_VERIFY_BOARD(p, bd)
> +do {
> +	if (!p)
> +		return 0;
> +
> +		bd = dev_get_drvdata(p);
> +		if (!bd || bd->magic != DGNC_BOARD_MAGIC)
> +			return 0;
> +		if (bd->state != BOARD_READY)
> +			return 0;
>  	} while (0)

This does not look correct.  You are still sort of defining a macro,
except that you have dropped all of the \s.  A macro has to be defined on
a single line, or a line continued with \, so this would cause major
syntax errors.  I think that someone else worked on similar code and found
that some of the tests were also not needed in the context in which this
code is used.

julia

>
>  static ssize_t vpd_show(struct device *p, struct device_attribute *attr,
> --
> 2.7.4
>
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