linux-kernel - [PATCH 3/5 v4] ASoC: nuc900: Fix platform_get

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Date:   Sun, 19 Nov 2017 09:45:02 +0530
From:   Arvind Yadav <arvind.yadav.cs@...il.com>
To:     lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz,
        tiwai@...e.com, matthias.bgg@...il.com,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux@...linux.org.uk
Cc:     linux-kernel@...r.kernel.org, alsa-devel@...a-project.org
Subject: [PATCH 3/5 v4] ASoC: nuc900: Fix platform_get_irq's error checking

The platform_get_irq() function returns negative if an error occurs.
zero or positive number on success. platform_get_irq() error checking
for zero is not correct.

Signed-off-by: Arvind Yadav <arvind.yadav.cs@...il.com>
---
changes in v2 :
               irq was unsigned. so using signed variable ret.
changes in v3 :
              Add failure case '<= 0' instead of '< 0'. IRQ0 is not valid.
changes in v4 :
              Return -ENODEV insted of irq.
 sound/soc/nuc900/nuc900-ac97.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/sound/soc/nuc900/nuc900-ac97.c b/sound/soc/nuc900/nuc900-ac97.c
index b6615af..893ccf2 100644
--- a/sound/soc/nuc900/nuc900-ac97.c
+++ b/sound/soc/nuc900/nuc900-ac97.c
@@ -345,11 +345,12 @@ static int nuc900_ac97_drvprobe(struct platform_device *pdev)
 		goto out;
 	}
 
-	nuc900_audio->irq_num = platform_get_irq(pdev, 0);
-	if (!nuc900_audio->irq_num) {
+	ret = platform_get_irq(pdev, 0);
+	if (ret <= 0) {
 		ret = -EBUSY;
 		goto out;
 	}
+	nuc900_audio->irq_num = ret;
 
 	nuc900_ac97_data = nuc900_audio;
 
-- 
2.7.4