[ALSA] ad1816a: Fix modprobe snd_mpu401 && modprobe snd_ad1816a

   The ad1816a driver fails if the mpu401 driver has been loaded first. This
patch against linux 2.6.20 fixes it by just ignoring the MPU-401 device in
that case, so that the rest of the sound card can be used. The ad1816a
driver already handles the MPU-401 device being unavailable due to lack of
resources in the same way.

Signed-off-by: Rask Ingemann Lambertsen <rask@sygehus.dk>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

1 files changed, 6 insertions, 2 deletions

diff --git a/sound/isa/ad1816a/ad1816a.c b/sound/isa/ad1816a/ad1816a.c
index 59034507175b..fc88a31da6f5 100644
--- a/sound/isa/ad1816a/ad1816a.c
+++ b/sound/isa/ad1816a/ad1816a.c
@@ -129,8 +129,8 @@ static int __devinit snd_card_ad1816a_pnp(int dev, struct snd_card_ad1816a *acar
         }
         acard->devmpu = pnp_request_card_device(card, id->devs[1].id, NULL);
         if (acard->devmpu == NULL) {
-                kfree(cfg);
-                return -EBUSY;
+                mpu_port[dev] = -1;
+                snd_printk(KERN_WARNING PFX "MPU401 device busy, skipping.\n");
         }
 
         pdev = acard->dev;
@@ -162,6 +162,10 @@ static int __devinit snd_card_ad1816a_pnp(int dev, struct snd_card_ad1816a *acar
         dma2[dev] = pnp_dma(pdev, 1);
         irq[dev] = pnp_irq(pdev, 0);
 
+        if (acard->devmpu == NULL) {
+                kfree(cfg);
+                return 0;
+        }
         pdev = acard->devmpu;
         pnp_init_resource_table(cfg);