ALSA: sb: fix a missing check of snd_ctl_add

snd_ctl_add() could fail, so let's check its return value and return its
error code upstream upon failure.

Signed-off-by: Aditya Pakki <pakki001@umn.edu>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 7 insertions, 3 deletions

diff --git a/sound/isa/sb/sb16_main.c b/sound/isa/sb/sb16_main.c
index 37e6ce7b0b13..981d65d122b6 100644
--- a/sound/isa/sb/sb16_main.c
+++ b/sound/isa/sb/sb16_main.c
@@ -879,10 +879,14 @@ int snd_sb16dsp_pcm(struct snd_sb *chip, int device)
         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_sb16_playback_ops);
         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_sb16_capture_ops);
 
-        if (chip->dma16 >= 0 && chip->dma8 != chip->dma16)
-                snd_ctl_add(card, snd_ctl_new1(&snd_sb16_dma_control, chip));
-        else
+        if (chip->dma16 >= 0 && chip->dma8 != chip->dma16) {
+                err = snd_ctl_add(card, snd_ctl_new1(
+                                        &snd_sb16_dma_control, chip));
+                if (err)
+                        return err;
+        } else {
                 pcm->info_flags = SNDRV_PCM_INFO_HALF_DUPLEX;
+        }
 
         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
                                               snd_dma_isa_data(),