ALSA: als4000: Fix potentially invalid DMA mode setup

My previous patch assumed that the DMA mode (represented by 3 lowest bits of ALS4K_GCR99_DMA_EMULATION_CTRL register) is set to the default value 0. If that's not the case, it might result in invalid mode to be set. This patch fixes this potential problem. Signed-off-by: Ondrej Zary <[email protected]> Signed-off-by: Takashi Iwai <[email protected]>
devinus · Aug 4, 2010 · c468584 · c468584
1 parent b961923
commit c468584
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/sound/pci/als4000.c b/sound/pci/als4000.c
@@ -765,7 +765,7 @@ static void snd_als4000_configure(struct snd_sb *chip)
 		snd_als4k_gcr_write(chip, i, 0);
 	/* enable burst mode to prevent dropouts during high PCI bus usage */
 	snd_als4k_gcr_write(chip, ALS4K_GCR99_DMA_EMULATION_CTRL,
-		snd_als4k_gcr_read(chip, ALS4K_GCR99_DMA_EMULATION_CTRL) | 0x04);
+		(snd_als4k_gcr_read(chip, ALS4K_GCR99_DMA_EMULATION_CTRL) & ~0x07) | 0x04);
 	spin_unlock_irq(&chip->reg_lock);
 }