V4L/DVB (3200): Fix saa7134 ALSA/OSS collisions

- When ALSA or OSS are loaded, check if the other is present
Fixed hotplug notifiers cleanup on module removal
- The saa7134 DMA sound modules now have their own Kconfig entries, and
if built statically enforce exclusivity
- SND_PCM_OSS isn't necessary for the OSS driver

Signed-off-by: Ricardo Cerqueira <v4l@cerqueira.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@brturbo.com.br>

1 files changed, 12 insertions, 3 deletions

diff --git a/drivers/media/video/saa7134/saa7134-oss.c b/drivers/media/video/saa7134/saa7134-oss.c
index c450d57b2949..8badd2a9cb2f 100644
--- a/drivers/media/video/saa7134/saa7134-oss.c
+++ b/drivers/media/video/saa7134/saa7134-oss.c
@@ -959,8 +959,17 @@ static int saa7134_oss_init(void)
 	struct saa7134_dev *dev = NULL;
 	struct list_head *list;
 
+	if (!dmasound_init && !dmasound_exit) {
+		dmasound_init = oss_device_init;
+		dmasound_exit = oss_device_exit;
+	} else {
+		printk(KERN_WARNING "saa7134 OSS: can't load, DMA sound handler already assigned (probably to ALSA)\n");
+		return -EBUSY;
+	}
+
 	printk(KERN_INFO "saa7134 OSS driver for DMA sound loaded\n");
 
+
 	list_for_each(list,&saa7134_devlist) {
 		dev = list_entry(list, struct saa7134_dev, devlist);
 		if (dev->dmasound.priv_data == NULL) {
@@ -974,9 +983,6 @@ 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;
 
 }
@@ -997,6 +1003,9 @@ static void saa7134_oss_exit(void)
 
 	}
 
+	dmasound_init = NULL;
+	dmasound_exit = NULL;
+
 	printk(KERN_INFO "saa7134 OSS driver for DMA sound unloaded\n");
 
 	return;