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ALSA: opl3sa2 - Fix NULL dereference when suspending snd_opl3sa2 

Fix the OOPS during a opl3sa2 card suspend
and resume if the driver is loaded but the card
is not found.

Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Cc: <stable@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Krzysztof Helt 2009-03-16 21:32:25 +01:00 committed by Takashi Iwai
parent 041b62374c
commit dde332b660
1 changed files with 12 additions and 6 deletions
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18
sound/isa/opl3sa2.c
View File

@ -550,21 +550,27 @@ static int __devinit snd_opl3sa2_mixer(struct snd_card *card)
#ifdef CONFIG_PM #ifdef CONFIG_PM
static int snd_opl3sa2_suspend(struct snd_card *card, pm_message_t state) static int snd_opl3sa2_suspend(struct snd_card *card, pm_message_t state)
{ {
struct snd_opl3sa2 *chip = card->private_data; if (card) {
struct snd_opl3sa2 *chip = card->private_data;
snd_power_change_state(card, SNDRV_CTL_POWER_D3hot); snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
chip->wss->suspend(chip->wss); chip->wss->suspend(chip->wss);
/* power down */ /* power down */
snd_opl3sa2_write(chip, OPL3SA2_PM_CTRL, OPL3SA2_PM_D3); snd_opl3sa2_write(chip, OPL3SA2_PM_CTRL, OPL3SA2_PM_D3);
}
return 0; return 0;
} }
static int snd_opl3sa2_resume(struct snd_card *card) static int snd_opl3sa2_resume(struct snd_card *card)
{ {
struct snd_opl3sa2 *chip = card->private_data; struct snd_opl3sa2 *chip;
int i; int i;
if (!card)
return 0;
chip = card->private_data;
/* power up */ /* power up */
snd_opl3sa2_write(chip, OPL3SA2_PM_CTRL, OPL3SA2_PM_D0); snd_opl3sa2_write(chip, OPL3SA2_PM_CTRL, OPL3SA2_PM_D0);