ALSA: cs4236: detect chip in one pass

The cs4236 was two step detection with call to the snd_wss_free()
between two steps. The snd_wss_free() did not free a sound device
created in the snd_wss_create(). This caused an OOPS during module
removal as the same sound device was released twice. The same OOPS
happened if the cs4236 module loading failed.

Fix this by adapting the snd_cs4236_create() to correctly work with
chips less capable then cs4236. The snd_cs4236_create() behaves the
same as the snd_wss_create() if the chip is less capable than the cs4236.

Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

3 files changed, 35 insertions, 31 deletions

diff --git a/sound/isa/cs423x/cs4236.c b/sound/isa/cs423x/cs4236.c
index a076a6c..93fa672 100644
--- a/sound/isa/cs423x/cs4236.c
+++ b/sound/isa/cs423x/cs4236.c
@@ -394,21 +394,15 @@ static int __devinit snd_cs423x_probe(struct snd_card *card, int dev)
 			return -EBUSY;
 		}
 
-	err = snd_wss_create(card, port[dev], cport[dev],
+	err = snd_cs4236_create(card, port[dev], cport[dev],
 			     irq[dev],
 			     dma1[dev], dma2[dev],
 			     WSS_HW_DETECT3, 0, &chip);
 	if (err < 0)
 		return err;
+
+	acard->chip = chip;
 	if (chip->hardware & WSS_HW_CS4236B_MASK) {
-		snd_wss_free(chip);
-		err = snd_cs4236_create(card,
-					port[dev], cport[dev],
-					irq[dev], dma1[dev], dma2[dev],
-					WSS_HW_DETECT, 0, &chip);
-		if (err < 0)
-			return err;
-		acard->chip = chip;
 
 		err = snd_cs4236_pcm(chip, 0, &pcm);
 		if (err < 0)
@@ -418,7 +412,6 @@ static int __devinit snd_cs423x_probe(struct snd_card *card, int dev)
 		if (err < 0)
 			return err;
 	} else {
-		acard->chip = chip;
 		err = snd_wss_pcm(chip, 0, &pcm);
 		if (err < 0)
 			return err;
diff --git a/sound/isa/cs423x/cs4236_lib.c b/sound/isa/cs423x/cs4236_lib.c
index 38835f3..1b1ad1c 100644
--- a/sound/isa/cs423x/cs4236_lib.c
+++ b/sound/isa/cs423x/cs4236_lib.c
@@ -87,6 +87,7 @@
 #include <sound/core.h>
 #include <sound/wss.h>
 #include <sound/asoundef.h>
+#include <sound/initval.h>
 
 /*
  *
@@ -264,7 +265,10 @@ static void snd_cs4236_resume(struct snd_wss *chip)
 }
 
 #endif /* CONFIG_PM */
-
+/*
+ * This function does no fail if the chip is not CS4236B or compatible.
+ * It just an equivalent to the snd_wss_create() then.
+ */
 int snd_cs4236_create(struct snd_card *card,
 		      unsigned long port,
 		      unsigned long cport,
@@ -281,21 +285,17 @@ int snd_cs4236_create(struct snd_card *card,
 	*rchip = NULL;
 	if (hardware == WSS_HW_DETECT)
 		hardware = WSS_HW_DETECT3;
-	if (cport < 0x100) {
-		snd_printk(KERN_ERR "please, specify control port "
-			   "for CS4236+ chips\n");
-		return -ENODEV;
-	}
+
 	err = snd_wss_create(card, port, cport,
 			     irq, dma1, dma2, hardware, hwshare, &chip);
 	if (err < 0)
 		return err;
 
-	if (!(chip->hardware & WSS_HW_CS4236B_MASK)) {
-		snd_printk(KERN_ERR "CS4236+: MODE3 and extended registers "
-			   "not available, hardware=0x%x\n", chip->hardware);
-		snd_device_free(card, chip);
-		return -ENODEV;
+	if ((chip->hardware & WSS_HW_CS4236B_MASK) == 0) {
+		snd_printd("chip is not CS4236+, hardware=0x%x\n",
+			   chip->hardware);
+		*rchip = chip;
+		return 0;
 	}
 #if 0
 	{
@@ -308,9 +308,16 @@ int snd_cs4236_create(struct snd_card *card,
 				   idx, snd_cs4236_ctrl_in(chip, idx));
 	}
 #endif
+	if (cport < 0x100 || cport == SNDRV_AUTO_PORT) {
+		snd_printk(KERN_ERR "please, specify control port "
+			   "for CS4236+ chips\n");
+		snd_device_free(card, chip);
+		return -ENODEV;
+	}
 	ver1 = snd_cs4236_ctrl_in(chip, 1);
 	ver2 = snd_cs4236_ext_in(chip, CS4236_VERSION);
-	snd_printdd("CS4236: [0x%lx] C1 (version) = 0x%x, ext = 0x%x\n", cport, ver1, ver2);
+	snd_printdd("CS4236: [0x%lx] C1 (version) = 0x%x, ext = 0x%x\n",
+			cport, ver1, ver2);
 	if (ver1 != ver2) {
 		snd_printk(KERN_ERR "CS4236+ chip detected, but "
 			   "control port 0x%lx is not valid\n", cport);
@@ -321,13 +328,17 @@ int snd_cs4236_create(struct snd_card *card,
 	snd_cs4236_ctrl_out(chip, 2, 0xff);
 	snd_cs4236_ctrl_out(chip, 3, 0x00);
 	snd_cs4236_ctrl_out(chip, 4, 0x80);
-	snd_cs4236_ctrl_out(chip, 5, ((IEC958_AES1_CON_PCM_CODER & 3) << 6) | IEC958_AES0_CON_EMPHASIS_NONE);
+	reg = ((IEC958_AES1_CON_PCM_CODER & 3) << 6) |
+	      IEC958_AES0_CON_EMPHASIS_NONE;
+	snd_cs4236_ctrl_out(chip, 5, reg);
 	snd_cs4236_ctrl_out(chip, 6, IEC958_AES1_CON_PCM_CODER >> 2);
 	snd_cs4236_ctrl_out(chip, 7, 0x00);
-	/* 0x8c for C8 is valid for Turtle Beach Malibu - the IEC-958 output */
-	/* is working with this setup, other hardware should have */
-	/* different signal paths and this value should be selectable */
-	/* in the future */
+	/*
+	 * 0x8c for C8 is valid for Turtle Beach Malibu - the IEC-958
+	 * output is working with this setup, other hardware should
+	 * have different signal paths and this value should be
+	 * selectable in the future
+	 */
 	snd_cs4236_ctrl_out(chip, 8, 0x8c);
 	chip->rate_constraint = snd_cs4236_xrate;
 	chip->set_playback_format = snd_cs4236_playback_format;
@@ -339,9 +350,10 @@ int snd_cs4236_create(struct snd_card *card,
 
 	/* initialize extended registers */
 	for (reg = 0; reg < sizeof(snd_cs4236_ext_map); reg++)
-		snd_cs4236_ext_out(chip, CS4236_I23VAL(reg), snd_cs4236_ext_map[reg]);
+		snd_cs4236_ext_out(chip, CS4236_I23VAL(reg),
+				   snd_cs4236_ext_map[reg]);
 
-        /* initialize compatible but more featured registers */
+	/* initialize compatible but more featured registers */
 	snd_wss_out(chip, CS4231_LEFT_INPUT, 0x40);
 	snd_wss_out(chip, CS4231_RIGHT_INPUT, 0x40);
 	snd_wss_out(chip, CS4231_AUX1_LEFT_INPUT, 0xff);
diff --git a/sound/isa/wss/wss_lib.c b/sound/isa/wss/wss_lib.c
index 2ba1897..705db09 100644
--- a/sound/isa/wss/wss_lib.c
+++ b/sound/isa/wss/wss_lib.c
@@ -1682,7 +1682,7 @@ static void snd_wss_resume(struct snd_wss *chip)
 }
 #endif /* CONFIG_PM */
 
-int snd_wss_free(struct snd_wss *chip)
+static int snd_wss_free(struct snd_wss *chip)
 {
 	release_and_free_resource(chip->res_port);
 	release_and_free_resource(chip->res_cport);
@@ -1705,7 +1705,6 @@ int snd_wss_free(struct snd_wss *chip)
 	kfree(chip);
 	return 0;
 }
-EXPORT_SYMBOL(snd_wss_free);
 
 static int snd_wss_dev_free(struct snd_device *device)
 {