[PATCH] V4L: Fix hotplugging issues with saa7134

- Fixed issue with hotplugging and DMA sound (sound was lost when replugging
  a card)

- Added notifiers to main saa7134 module to let the sound sub-modules know
  when a card has been inserted or removed

Signed-off-by: Ricardo Cerqueira <v4l@cerqueira.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@brturbo.com.br>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 46 insertions, 31 deletions

diff --git a/drivers/media/video/saa7134/saa7134-oss.c b/drivers/media/video/saa7134/saa7134-oss.c
index fd9ed11ab1e2..299046974382 100644
--- a/drivers/media/video/saa7134/saa7134-oss.c
+++ b/drivers/media/video/saa7134/saa7134-oss.c
@@ -903,22 +903,22 @@ int saa7134_dsp_create(struct saa7134_dev *dev)
 {
 	int err;
 
-                        err = dev->dmasound.minor_dsp =
-                                register_sound_dsp(&saa7134_dsp_fops,
-                                                   dsp_nr[dev->nr]);
-                        if (err < 0) {
-                                goto fail;
-                        }
-                        printk(KERN_INFO "%s: registered device dsp%d\n",
-                               dev->name,dev->dmasound.minor_dsp >> 4);
-
-                        err = dev->dmasound.minor_mixer =
-                                register_sound_mixer(&saa7134_mixer_fops,
-                                                     mixer_nr[dev->nr]);
-                        if (err < 0)
-                                goto fail;
-                        printk(KERN_INFO "%s: registered device mixer%d\n",
-                               dev->name,dev->dmasound.minor_mixer >> 4);
+	err = dev->dmasound.minor_dsp =
+		register_sound_dsp(&saa7134_dsp_fops,
+                			dsp_nr[dev->nr]);
+	if (err < 0) {
+		goto fail;
+	}
+	printk(KERN_INFO "%s: registered device dsp%d\n",
+		dev->name,dev->dmasound.minor_dsp >> 4);
+
+	err = dev->dmasound.minor_mixer =
+		register_sound_mixer(&saa7134_mixer_fops,
+					mixer_nr[dev->nr]);
+	if (err < 0)
+		goto fail;
+	printk(KERN_INFO "%s: registered device mixer%d\n",
+		dev->name,dev->dmasound.minor_mixer >> 4);
 
 	return 0;
 
@@ -929,6 +929,31 @@ fail:
 
 }
 
+static int oss_device_init(struct saa7134_dev *dev)
+{
+	dev->dmasound.priv_data = dev;
+	saa7134_oss_init1(dev);
+	saa7134_dsp_create(dev);
+	return 1;
+}
+
+static int oss_device_exit(struct saa7134_dev *dev)
+{
+
+	unregister_sound_mixer(dev->dmasound.minor_mixer);
+	unregister_sound_dsp(dev->dmasound.minor_dsp);
+
+	saa7134_oss_fini(dev);
+
+	if (dev->pci->irq > 0) {
+		synchronize_irq(dev->pci->irq);
+		free_irq(dev->pci->irq,&dev->dmasound);
+	}
+
+	dev->dmasound.priv_data = NULL;
+	return 1;
+}
+
 static int saa7134_oss_init(void)
 {
         struct saa7134_dev *dev = NULL;
@@ -939,9 +964,7 @@ static int saa7134_oss_init(void)
         list_for_each(list,&saa7134_devlist) {
                 dev = list_entry(list, struct saa7134_dev, devlist);
 		if (dev->dmasound.priv_data == NULL) {
-			dev->dmasound.priv_data = dev;
-			saa7134_oss_init1(dev);
-			saa7134_dsp_create(dev);
+			oss_device_init(dev);
 		} else {
                 	printk(KERN_ERR "saa7134 OSS: DMA sound is being handled by ALSA, ignoring %s\n",dev->name);
 			return -EBUSY;
@@ -951,6 +974,9 @@ static int saa7134_oss_init(void)
         if (dev == NULL)
                 printk(KERN_INFO "saa7134 OSS: no saa7134 cards found\n");
 
+	dmasound_init = oss_device_init;
+	dmasound_exit = oss_device_exit;
+
         return 0;
 
 }
@@ -967,18 +993,7 @@ void saa7134_oss_exit(void)
 		if (!dev->dmasound.minor_dsp)
 			continue;
 
-                unregister_sound_mixer(dev->dmasound.minor_mixer);
-                unregister_sound_dsp(dev->dmasound.minor_dsp);
-
-		saa7134_oss_fini(dev);
-
-		if (dev->pci->irq > 0) {
-			synchronize_irq(dev->pci->irq);
-			free_irq(dev->pci->irq,&dev->dmasound);
-		}
-
-        	dev->dmasound.priv_data = NULL;
-
+		oss_device_exit(dev);
         }
 
         printk(KERN_INFO "saa7134 OSS driver for DMA sound unloaded\n");