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SubjectRe: [PATCH 3/7] s390/qeth: Convert snprintf() to scnprintf()
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On Wed, 2022-09-28 at 10:24 +0200, Alexandra Winter wrote:
> On 27.09.22 16:27, Joe Perches wrote:
> > On Mon, 2022-09-26 at 19:42 +0100, Jules Irenge wrote:
> > > Coccinnelle reports a warning
> > > Warning: Use scnprintf or sprintf
> > > Adding to that, there has been a slow migration from snprintf to scnprintf.
> > > This LWN article explains the rationale for this change
> > > https: //lwn.net/Articles/69419/
> > > Ie. snprintf() returns what *would* be the resulting length,
> > > while scnprintf() returns the actual length.
> > []
> > > diff --git a/drivers/s390/net/qeth_core_sys.c b/drivers/s390/net/qeth_core_sys.c
> > []
> > > @@ -500,9 +500,9 @@ static ssize_t qeth_hw_trap_show(struct device *dev,
> > > struct qeth_card *card = dev_get_drvdata(dev);
> > >
> > > if (card->info.hwtrap)
> > > - return snprintf(buf, 5, "arm\n");
> > > + return scnprintf(buf, 5, "arm\n");
> > > else
> > > - return snprintf(buf, 8, "disarm\n");
> > > + return scnprintf(buf, 8, "disarm\n");
> > > }
> >
> > Use sysfs_emit instead.
> >
>
> Thank you Joe, that sounds like the best way to handle this.
> I propose that I take this onto my ToDo list and test it in the s390 environment.
> I will add
> Reported-by: Jules Irenge <jbi.octave@gmail.com>
> Suggested-by: Joe Perches <joe@perches.com>
>

Thanks.

btw: I was careless when I wrote one section of the proposed patch.

In this patch block,

@@ -467,28 +478,31 @@ static ssize_t qeth_dev_switch_attrs_show(struct device *dev,

The last line

+ return sysfs_emit_at(buf, len, "\n");

is not correct

It needs to be changed to:

len += sysfs_emit_at(buf, len, "\n");

return len;

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