[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, 16 insertions, 0 deletions

diff --git a/drivers/media/video/saa7134/saa7134-core.c b/drivers/media/video/saa7134/saa7134-core.c
index 4275d2d..0aca722 100644
--- a/drivers/media/video/saa7134/saa7134-core.c
+++ b/drivers/media/video/saa7134/saa7134-core.c
@@ -88,6 +88,9 @@ LIST_HEAD(saa7134_devlist);
 static LIST_HEAD(mops_list);
 static unsigned int saa7134_devcount;
 
+int (*dmasound_init)(struct saa7134_dev *dev);
+int (*dmasound_exit)(struct saa7134_dev *dev);
+
 #define dprintk(fmt, arg...)	if (core_debug) \
 	printk(KERN_DEBUG "%s/core: " fmt, dev->name , ## arg)
 
@@ -1017,6 +1020,10 @@ static int __devinit saa7134_initdev(struct pci_dev *pci_dev,
 	/* check for signal */
 	saa7134_irq_video_intl(dev);
 
+	if (dmasound_init && !dev->dmasound.priv_data) {
+		dmasound_init(dev);
+	}
+
 	return 0;
 
  fail4:
@@ -1040,6 +1047,11 @@ static void __devexit saa7134_finidev(struct pci_dev *pci_dev)
 	struct list_head *item;
 	struct saa7134_mpeg_ops *mops;
 
+	/* Release DMA sound modules if present */
+	if (dmasound_exit && dev->dmasound.priv_data) {
+		dmasound_exit(dev);
+	}
+
 	/* debugging ... */
 	if (irq_debug) {
 		u32 report = saa_readl(SAA7134_IRQ_REPORT);
@@ -1071,6 +1083,7 @@ static void __devexit saa7134_finidev(struct pci_dev *pci_dev)
 	saa7134_i2c_unregister(dev);
 	saa7134_unregister_video(dev);
 
+
 	/* the DMA sound modules should be unloaded before reaching
 	   this, but just in case they are still present... */
 	if (dev->dmasound.priv_data != NULL) {
@@ -1078,6 +1091,7 @@ static void __devexit saa7134_finidev(struct pci_dev *pci_dev)
 		dev->dmasound.priv_data = NULL;
 	}
 
+
 	/* release resources */
 	free_irq(pci_dev->irq, dev);
 	iounmap(dev->lmmio);
@@ -1168,6 +1182,8 @@ EXPORT_SYMBOL(saa7134_boards);
 
 /* ----------------- for the DMA sound modules --------------- */
 
+EXPORT_SYMBOL(dmasound_init);
+EXPORT_SYMBOL(dmasound_exit);
 EXPORT_SYMBOL(saa7134_pgtable_free);
 EXPORT_SYMBOL(saa7134_pgtable_build);
 EXPORT_SYMBOL(saa7134_pgtable_alloc);