[alsa-devel] [PATCH] opti-miro: fix OOPS if hardware is not detected

[Krzysztof Helt]

From: Krzysztof Helt <krzysztof.h1 at wp.pl>

If a hardware is not detected there is a kernel crash
due to not initialized snd_miro->aci pointer. This pointer
is initialized after detection of the opti (miro) chip.

This bug was introduced by patches to expose
ACI mikser outside the snd-miro driver.

Signed-off-by: Krzysztof Helt <krzysztof.h1 at wp.pl>
---

 sound/isa/opti9xx/miro.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/sound/isa/opti9xx/miro.c b/sound/isa/opti9xx/miro.c
index 40b64cd..e374869 100644
--- a/sound/isa/opti9xx/miro.c
+++ b/sound/isa/opti9xx/miro.c
@@ -1229,7 +1229,8 @@ static void snd_card_miro_free(struct snd_card *card)
 	struct snd_miro *miro = card->private_data;
         
 	release_and_free_resource(miro->res_aci_port);
-	miro->aci->aci_port = 0;
+	if (miro->aci)
+		miro->aci->aci_port = 0;
 	release_and_free_resource(miro->res_mc_base);
 }
 
-- 
1.6.4


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