ALSA: hda - Add reboot notifier
The current snd-hda-intel driver seems blocking the power-off on some
devices like eeepc. Although this is likely a BIOS problem, we can add
a workaround by disabling IRQ lines before power-off operation.
This patch adds the reboot notifier to achieve it.
The detailed problem description is found in bug#11889:
http://bugme.linux-foundation.org/show_bug.cgi?id=11889
Tested-by: Luiz Fernando N. Capitulino <lcapitulino@mandriva.com.br>
Cc: stable@kernel.org
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 9f316c1..c04ac38 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -45,6 +45,7 @@
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/mutex.h>
+#include <linux/reboot.h>
#include <sound/core.h>
#include <sound/initval.h>
#include "hda_codec.h"
@@ -397,6 +398,9 @@
/* for pending irqs */
struct work_struct irq_pending_work;
+
+ /* reboot notifier (for mysterious hangup problem at power-down) */
+ struct notifier_block reboot_notifier;
};
/* driver types */
@@ -1979,12 +1983,36 @@
/*
+ * reboot notifier for hang-up problem at power-down
+ */
+static int azx_halt(struct notifier_block *nb, unsigned long event, void *buf)
+{
+ struct azx *chip = container_of(nb, struct azx, reboot_notifier);
+ azx_stop_chip(chip);
+ return NOTIFY_OK;
+}
+
+static void azx_notifier_register(struct azx *chip)
+{
+ chip->reboot_notifier.notifier_call = azx_halt;
+ register_reboot_notifier(&chip->reboot_notifier);
+}
+
+static void azx_notifier_unregister(struct azx *chip)
+{
+ if (chip->reboot_notifier.notifier_call)
+ unregister_reboot_notifier(&chip->reboot_notifier);
+}
+
+/*
* destructor
*/
static int azx_free(struct azx *chip)
{
int i;
+ azx_notifier_unregister(chip);
+
if (chip->initialized) {
azx_clear_irq_pending(chip);
for (i = 0; i < chip->num_streams; i++)
@@ -2348,6 +2376,7 @@
pci_set_drvdata(pci, card);
chip->running = 1;
power_down_all_codecs(chip);
+ azx_notifier_register(chip);
dev++;
return err;