linux-kernel - Re: [PATCH 7/7] staging: cxt1e1: remove unneeded a value

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Date:	Thu, 6 Mar 2014 08:33:28 +0100
From:	Tobias Klauser <tklauser@...tanz.ch>
To:	DaeSeok Youn <daeseok.youn@...il.com>
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	devel <devel@...verdev.osuosl.org>,
	Shaun Laing <shaun@...source.ca>,
	"sachin.kamat" <sachin.kamat@...aro.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Dulshani Gunawardhana <dulshani.gunawardhana89@...il.com>,
	"ying.xue" <ying.xue@...driver.com>,
	David Miller <davem@...emloft.net>
Subject: Re: [PATCH 7/7] staging: cxt1e1: remove unneeded a value

On 2014-03-06 at 08:19:19 +0100, DaeSeok Youn <daeseok.youn@...il.com> wrote:
> 2014-03-05 19:13 GMT+09:00 Tobias Klauser <tklauser@...tanz.ch>:
> > On 2014-03-05 at 02:24:22 +0100, Daeseok Youn <daeseok.youn@...il.com> wrote:
> >>
> >> It doesn't need to assign name array address to np pointer.
> >>
> >> Signed-off-by: Daeseok Youn <daeseok.youn@...il.com>
> >> ---
> >>  drivers/staging/cxt1e1/linux.c |    5 ++---
> >>  1 files changed, 2 insertions(+), 3 deletions(-)
> >>
> >> diff --git a/drivers/staging/cxt1e1/linux.c b/drivers/staging/cxt1e1/linux.c
> >> index 5bb42ae..cae8c66 100644
> >> --- a/drivers/staging/cxt1e1/linux.c
> >> +++ b/drivers/staging/cxt1e1/linux.c
> >> @@ -205,15 +205,14 @@ status_t
> >>  c4_wq_port_init(mpi_t *pi)
> >>  {
> >>
> >> -     char        name[16], *np;  /* NOTE: name of the queue limited by system
> >> +     char        name[16];  /* NOTE: name of the queue limited by system
> >>                                    * to 10 characters */
> >>
> >>       if (pi->wq_port)
> >>               return 0;                   /* already initialized */
> >>
> >> -     np = name;
> >>       memset(name, 0, 16);
> >
> > This isn't necessary since s{,n}printf() adds a terminating '\0'.
> Yes, I have looked at lib/vsprintf.c. I found it adds null to a string
> in the end of vsnprintf() function.
> I will remove memset() line.
> 
> >
> >> -     sprintf(np, "%s%d", pi->up->devname, pi->portnum); /* IE pmcc4-01) */
> >> +     sprintf(name, "%s%d", pi->up->devname, pi->portnum); /* IE pmcc4-01) */
> >
> > Better use snprintf() here, even if the comment above claims the name
> > never to be no longer than 10 characters.
> OK. I will replace sprintf with snprintf() and set a string length to "10".

It's probably fine to leave the string at length 16 (since there's also
a number appended to it) and the use sizeof(name) for the snprintf call.

Cheers
Tobias
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