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ALSA: hda - Fix registration race of VGA switcheroo

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Delay the registration of VGA switcheroo client to the end of the
probing.  Otherwise a too quick switching may result in Oops during
probing.

Also add the check of the return value from snd_hda_lock_devices().

Reported-and-tested-by: Daniel J Blueman <daniel@quora.org>
Cc: <stable@vger.kernel.org> [v3.5+]
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2012-10-12 17:28:18 +02:00
parent e73fa21b4e
commit 128960a9ad
1 changed files with 20 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
sound/pci/hda/hda_intel.c
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@ -501,6 +501,7 @@ struct azx {
/* VGA-switcheroo setup */
unsigned int use_vga_switcheroo:1;
unsigned int vga_switcheroo_registered:1;
unsigned int init_failed:1; /* delayed init failed */
unsigned int disabled:1; /* disabled by VGA-switcher */
@ -2640,7 +2641,9 @@ static void azx_vs_set_state(struct pci_dev *pci,
if (disabled) {
azx_suspend(&pci->dev);
chip->disabled = true;
snd_hda_lock_devices(chip->bus);
if (snd_hda_lock_devices(chip->bus))
snd_printk(KERN_WARNING SFX
"Cannot lock devices!\n");
} else {
snd_hda_unlock_devices(chip->bus);
chip->disabled = false;
@ -2683,14 +2686,20 @@ static const struct vga_switcheroo_client_ops azx_vs_ops = {
static int __devinit register_vga_switcheroo(struct azx *chip)
{
int err;
if (!chip->use_vga_switcheroo)
return 0;
/* FIXME: currently only handling DIS controller
* is there any machine with two switchable HDMI audio controllers?
*/
return vga_switcheroo_register_audio_client(chip->pci, &azx_vs_ops,
err = vga_switcheroo_register_audio_client(chip->pci, &azx_vs_ops,
VGA_SWITCHEROO_DIS,
chip->bus != NULL);
if (err < 0)
return err;
chip->vga_switcheroo_registered = 1;
return 0;
}
#else
#define init_vga_switcheroo(chip) /* NOP */
@ -2712,7 +2721,8 @@ static int azx_free(struct azx *chip)
if (use_vga_switcheroo(chip)) {
if (chip->disabled && chip->bus)
snd_hda_unlock_devices(chip->bus);
vga_switcheroo_unregister_client(chip->pci);
if (chip->vga_switcheroo_registered)
vga_switcheroo_unregister_client(chip->pci);
}
if (chip->initialized) {
@ -3060,14 +3070,6 @@ static int __devinit azx_create(struct snd_card *card, struct pci_dev *pci,
}
ok:
err = register_vga_switcheroo(chip);
if (err < 0) {
snd_printk(KERN_ERR SFX
"Error registering VGA-switcheroo client\n");
azx_free(chip);
return err;
}
err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
if (err < 0) {
snd_printk(KERN_ERR SFX "Error creating device [card]!\n");
@ -3338,6 +3340,13 @@ static int __devinit azx_probe(struct pci_dev *pci,
if (pci_dev_run_wake(pci))
pm_runtime_put_noidle(&pci->dev);
err = register_vga_switcheroo(chip);
if (err < 0) {
snd_printk(KERN_ERR SFX
"Error registering VGA-switcheroo client\n");
goto out_free;
}
dev++;
return 0;