linux-kernel - Re: [PATCH] sound: Fix warnings relating to ignored return value in snd_card

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Date:	Tue, 18 Nov 2008 18:06:23 +0100
From:	"Hannes Eder" <hannes@...neseder.net>
To:	"Takashi Iwai" <tiwai@...e.de>
Cc:	"Jaroslav Kysela" <perex@...ex.cz>,
	kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sound: Fix warnings relating to ignored return value in snd_card_register

Do not ignore the return of 'device_create_file' in
'snd_card_register' and thereby fixing the following warnings:

sound/core/init.c: In function 'snd_card_register':
sound/core/init.c:640: warning: ignoring return value of
'device_create_file', declared with attribute warn_unused_result
sound/core/init.c:641: warning: ignoring return value of
'device_create_file', declared with attribute warn_unused_result

Signed-off-by: Hannes Eder <hannes@...neseder.net>
---

On Tue, Nov 18, 2008 at 11:14 AM, Takashi Iwai <tiwai@...e.de> wrote:
> The changes look good, but please run checkpatch.pl to your patch and
> fix the coding style issues suggested there.

I did not fix:

"WARNING: line over 80 characters" as they a hardly longer than 80
characters and there are lines longer than this in the same file.

"ERROR: do not use assignment in if condition" as this pattern seems
to be quite common.

Comments? Should I fix them?

 sound/core/init.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/sound/core/init.c b/sound/core/init.c
index af1e407..814d834 100644
--- a/sound/core/init.c
+++ b/sound/core/init.c
@@ -637,8 +637,10 @@ int snd_card_register(struct snd_card *card)
 #endif
 #ifndef CONFIG_SYSFS_DEPRECATED
 	if (card->card_dev) {
-		device_create_file(card->card_dev, &card_id_attrs);
-		device_create_file(card->card_dev, &card_number_attrs);
+		if ((err = device_create_file(card->card_dev, &card_id_attrs)) < 0)
+			return err;
+		if ((err = device_create_file(card->card_dev, &card_number_attrs)) < 0)
+			return err;
 	}
 #endif
 	return 0;
--
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