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Date: Tue, 6 Aug 2019 21:48:54 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Stefan Schmidt <stefan@...enfreihafen.org>
Cc: netdev@...r.kernel.org,
Michael Hennerich <michael.hennerich@...log.com>,
Alexander Aring <alex.aring@...il.com>,
"David S. Miller" <davem@...emloft.net>,
Harry Morris <h.morris@...coda.com>, linux-wpan@...r.kernel.org
Subject: Re: [PATCH 17/17] ieee802154: no need to check return value of
debugfs_create functions
On Tue, Aug 06, 2019 at 09:22:43PM +0200, Stefan Schmidt wrote:
> Hello.
>
> On 06.08.19 18:11, Greg Kroah-Hartman wrote:
> > When calling debugfs functions, there is no need to ever check the
> > return value. The function can work or not, but the code logic should
> > never do something different based on this.
> >
> > Cc: Michael Hennerich <michael.hennerich@...log.com>
> > Cc: Alexander Aring <alex.aring@...il.com>
> > Cc: Stefan Schmidt <stefan@...enfreihafen.org>
> > Cc: "David S. Miller" <davem@...emloft.net>
> > Cc: Harry Morris <h.morris@...coda.com>
> > Cc: linux-wpan@...r.kernel.org
> > Cc: netdev@...r.kernel.org
> > Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > ---
> > drivers/net/ieee802154/adf7242.c | 12 +++---------
> > drivers/net/ieee802154/at86rf230.c | 20 +++++---------------
> > drivers/net/ieee802154/ca8210.c | 9 +--------
> > 3 files changed, 9 insertions(+), 32 deletions(-)
> >
> > diff --git a/drivers/net/ieee802154/adf7242.c b/drivers/net/ieee802154/adf7242.c
> > index c9392d70e639..7b95add2235a 100644
> > --- a/drivers/net/ieee802154/adf7242.c
> > +++ b/drivers/net/ieee802154/adf7242.c
> > @@ -1158,7 +1158,7 @@ static int adf7242_stats_show(struct seq_file *file, void *offset)
> > return 0;
> > }
> >
> > -static int adf7242_debugfs_init(struct adf7242_local *lp)
> > +static void adf7242_debugfs_init(struct adf7242_local *lp)
> > {
> > char debugfs_dir_name[DNAME_INLINE_LEN + 1] = "adf7242-";
> > struct dentry *stats;
>
> A quick look over the code indicates that the stats variable can go as
> well now as it is only used in the now removed code.
Odd 0-day never gave me a build warning for it, sorry about that.
>
> > @@ -1166,15 +1166,9 @@ static int adf7242_debugfs_init(struct adf7242_local *lp)
> > strncat(debugfs_dir_name, dev_name(&lp->spi->dev), DNAME_INLINE_LEN);
> >
> > lp->debugfs_root = debugfs_create_dir(debugfs_dir_name, NULL);
> > - if (IS_ERR_OR_NULL(lp->debugfs_root))
> > - return PTR_ERR_OR_ZERO(lp->debugfs_root);
> >
> > - stats = debugfs_create_devm_seqfile(&lp->spi->dev, "status",
> > - lp->debugfs_root,
> > - adf7242_stats_show);
> > - return PTR_ERR_OR_ZERO(stats);
> > -
> > - return 0;
> > + debugfs_create_devm_seqfile(&lp->spi->dev, "status", lp->debugfs_root,
> > + adf7242_stats_show);
> > }
> >
> > static const s32 adf7242_powers[] = {
> > diff --git a/drivers/net/ieee802154/at86rf230.c b/drivers/net/ieee802154/at86rf230.c
> > index 595cf7e2a651..7d67f41387f5 100644
> > --- a/drivers/net/ieee802154/at86rf230.c
> > +++ b/drivers/net/ieee802154/at86rf230.c
> > @@ -1626,24 +1626,16 @@ static int at86rf230_stats_show(struct seq_file *file, void *offset)
> > }
> > DEFINE_SHOW_ATTRIBUTE(at86rf230_stats);
> >
> > -static int at86rf230_debugfs_init(struct at86rf230_local *lp)
> > +static void at86rf230_debugfs_init(struct at86rf230_local *lp)
> > {
> > char debugfs_dir_name[DNAME_INLINE_LEN + 1] = "at86rf230-";
> > - struct dentry *stats;
> >
> > strncat(debugfs_dir_name, dev_name(&lp->spi->dev), DNAME_INLINE_LEN);
> >
> > at86rf230_debugfs_root = debugfs_create_dir(debugfs_dir_name, NULL);
> > - if (!at86rf230_debugfs_root)
> > - return -ENOMEM;
> > -
> > - stats = debugfs_create_file("trac_stats", 0444,
> > - at86rf230_debugfs_root, lp,
> > - &at86rf230_stats_fops);
> > - if (!stats)
> > - return -ENOMEM;
> >
> > - return 0;
> > + debugfs_create_file("trac_stats", 0444, at86rf230_debugfs_root, lp,
> > + &at86rf230_stats_fops);
> > }
> >
> > static void at86rf230_debugfs_remove(void)
> > @@ -1651,7 +1643,7 @@ static void at86rf230_debugfs_remove(void)
> > debugfs_remove_recursive(at86rf230_debugfs_root);
> > }
> > #else
> > -static int at86rf230_debugfs_init(struct at86rf230_local *lp) { return 0; }
> > +static void at86rf230_debugfs_init(struct at86rf230_local *lp) { }
> > static void at86rf230_debugfs_remove(void) { }
> > #endif
> >
> > @@ -1751,9 +1743,7 @@ static int at86rf230_probe(struct spi_device *spi)
> > /* going into sleep by default */
> > at86rf230_sleep(lp);
> >
> > - rc = at86rf230_debugfs_init(lp);
> > - if (rc)
> > - goto free_dev;
> > + at86rf230_debugfs_init(lp);
> >
> > rc = ieee802154_register_hw(lp->hw);
> > if (rc)
> > diff --git a/drivers/net/ieee802154/ca8210.c b/drivers/net/ieee802154/ca8210.c
> > index b188fce3f641..11402dc347db 100644
> > --- a/drivers/net/ieee802154/ca8210.c
> > +++ b/drivers/net/ieee802154/ca8210.c
> > @@ -3019,14 +3019,7 @@ static int ca8210_test_interface_init(struct ca8210_priv *priv)
> > priv,
> > &test_int_fops
> > );
> > - if (IS_ERR(test->ca8210_dfs_spi_int)) {
> > - dev_err(
> > - &priv->spi->dev,
> > - "Error %ld when creating debugfs node\n",
> > - PTR_ERR(test->ca8210_dfs_spi_int)
> > - );
> > - return PTR_ERR(test->ca8210_dfs_spi_int);
> > - }
> > +
> > debugfs_create_symlink("ca8210", NULL, node_name);
> > init_waitqueue_head(&test->readq);
> > return kfifo_alloc(
> >
>
> With a fix for the above included you can have my
>
>
> Acked-by: Stefan Schmidt <stefan@...enfreihafen.org>
>
> for version 2.
I'll fix it up and resend tomorrow, thanks!
greg k-h
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