linux-kernel - RE: [PATCH] Staging: comedi: ssv_snp: fix checkpatch.pl warnings

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Date:	Thu, 9 Aug 2012 11:27:41 -0500
From:	H Hartley Sweeten <hartleys@...ionengravers.com>
To:	Güngör Erseymen <gelurine@...il.com>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
CC:	"abbotti@....co.uk" <abbotti@....co.uk>,
	"fmhess@...rs.sourceforge.net" <fmhess@...rs.sourceforge.net>,
	"devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] Staging: comedi: ssv_snp: fix checkpatch.pl warnings

On Thursday, August 09, 2012 8:20 AM, Güngör Erseymen wrote:
> Fix two checkpatch.pl warnings about printk issues by using
> pr_info(...) instead of printk(KERN_INFO, ...).
>
> Signed-off-by: Güngör Erseymen <gelurine@...il.com>
> ---
>  drivers/staging/comedi/drivers/ssv_dnp.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

Hello Güngör,

You have a typo in the subject for this patch.
"ssv_snp" should be "ssv_dnp"

>
> diff --git a/drivers/staging/comedi/drivers/ssv_dnp.c b/drivers/staging/comedi/drivers/ssv_dnp.c
> index 84b9f2a..4cd0f1b 100644
> --- a/drivers/staging/comedi/drivers/ssv_dnp.c
> +++ b/drivers/staging/comedi/drivers/ssv_dnp.c
> @@ -177,7 +177,7 @@ static int dnp_attach(struct comedi_device *dev, struct comedi_devconfig *it)
>  	struct comedi_subdevice *s;
>  	int ret;
>  
> -	printk(KERN_INFO "comedi%d: dnp: ", dev->minor);
> +	pr_info("comedi%d: dnp: ", dev->minor);
 
Where possible, fixes like this should use the dev_printk versions.
For instance, this one would be:

	dev_info(dev->class_dev, "dnp:");

But, there is a cleaner fix for this file. See below.

> 	dev->board_name = board->name;
>
> @@ -195,7 +195,7 @@ static int dnp_attach(struct comedi_device *dev, struct comedi_devconfig *it)
> 	s->insn_bits = dnp_dio_insn_bits;
> 	s->insn_config = dnp_dio_insn_config;
> 
> -	printk("attached\n");
> +	pr_info("attached\n");

There are only two printk's in this file, both in the "attach" routine.

The first one does not have a "\n" and the function could exit without
ever terminating the message.

A better fix would be to merge the two messages into one "attached" message
at the end of the function. You could also use the dev->board_name instead of
the open coded string. Something like:

	dev_info(dev->class_dev, "%s: attached\n", dev->board_name);

Also, the message should be moved so that it's the last thing that happens
before the function returns.

Regards,
Hartley

> 
>  	/* We use the I/O ports 0x22,0x23 and 0xa3-0xa9, which are always
> 	 * allocated for the primary 8259, so we don't need to allocate them
-- 
1.7.11.4