[alsa-devel] [PATCH 1/2] opti93x: fix irq releasing if the irq cannot be allocated

[Krzysztof Helt]

From: Krzysztof Helt <krzysztof.h1 at wp.pl>

Fix the bug that an irq is released if the irq's allocation fails.
Move irq allocation earlier so the codec->irq is not set if the request_irq() fails. 

Signed-off-by: Krzysztof Helt <krzysztof.h1 at wp.pl>
---
A different approach than the previous one.

 sound/isa/opti9xx/opti92x-ad1848.c |   25 ++++++++++++++-----------
 1 files changed, 14 insertions(+), 11 deletions(-)

diff --git a/sound/isa/opti9xx/opti92x-ad1848.c b/sound/isa/opti9xx/opti92x-ad1848.c
index 5cd5553..fd32001 100644
--- a/sound/isa/opti9xx/opti92x-ad1848.c
+++ b/sound/isa/opti9xx/opti92x-ad1848.c
@@ -558,10 +558,13 @@ __skip_mpu:
 
 static irqreturn_t snd_opti93x_interrupt(int irq, void *dev_id)
 {
-	struct snd_wss *codec = dev_id;
-	struct snd_opti9xx *chip = codec->card->private_data;
+	struct snd_opti9xx *chip = dev_id;
+	struct snd_wss *codec = chip->codec;
 	unsigned char status;
 
+	if (!codec)
+		return IRQ_HANDLED;
+
 	status = snd_opti9xx_read(chip, OPTi9XX_MC_REG(11));
 	if ((status & OPTi93X_IRQ_PLAYBACK) && codec->playback_substream)
 		snd_pcm_period_elapsed(codec->playback_substream);
@@ -690,7 +693,7 @@ static void snd_card_opti9xx_free(struct snd_card *card)
 		struct snd_wss *codec = chip->codec;
 		if (codec && codec->irq > 0) {
 			disable_irq(codec->irq);
-			free_irq(codec->irq, codec);
+			free_irq(codec->irq, chip);
 		}
 #endif
 		release_and_free_resource(chip->res_mc_base);
@@ -738,6 +741,14 @@ static int __devinit snd_opti9xx_probe(struct snd_card *card)
 	if (error)
 		return error;
 
+#ifdef OPTi93X
+	error = request_irq(chip->irq, snd_opti93x_interrupt,
+			    IRQF_DISABLED, DEV_NAME" - WSS", chip);
+	if (error < 0) {
+		snd_printk(KERN_ERR "opti9xx: can't grab IRQ %d\n", chip->irq);
+		return error;
+	}
+#endif
 	error = snd_wss_create(card, chip->wss_base + 4, -1,
 			       chip->irq, chip->dma1, chip->dma2,
 #ifdef OPTi93X
@@ -762,14 +773,6 @@ static int __devinit snd_opti9xx_probe(struct snd_card *card)
 	if (error < 0)
 		return error;
 #endif
-#ifdef OPTi93X
-	error = request_irq(chip->irq, snd_opti93x_interrupt,
-			    IRQF_DISABLED, DEV_NAME" - WSS", codec);
-	if (error < 0) {
-		snd_printk(KERN_ERR "opti9xx: can't grab IRQ %d\n", chip->irq);
-		return error;
-	}
-#endif
 	strcpy(card->driver, chip->name);
 	sprintf(card->shortname, "OPTi %s", card->driver);
 #if defined(CS4231) || defined(OPTi93X)
-- 
1.6.4


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