[PATCH 3.18 05/85] ALSA: emu10k1: add error handling for snd_ctl_add

[Greg Kroah-Hartman]

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Zhouyang Jia <jiazhouyan...@gmail.com>

[ Upstream commit 6d531e7b972cb62ded011c2dfcc2d9f72ea6c421 ]

When snd_ctl_add fails, the lack of error-handling code may
cause unexpected results.

This patch adds error-handling code after calling snd_ctl_add.

Signed-off-by: Zhouyang Jia <jiazhouyan...@gmail.com>
Signed-off-by: Takashi Iwai <ti...@suse.de>
Signed-off-by: Sasha Levin <alexander.le...@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 sound/pci/emu10k1/emupcm.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/sound/pci/emu10k1/emupcm.c
+++ b/sound/pci/emu10k1/emupcm.c
@@ -1875,7 +1875,9 @@ int snd_emu10k1_pcm_efx(struct snd_emu10
        if (!kctl)
                return -ENOMEM;
        kctl->id.device = device;
-       snd_ctl_add(emu->card, kctl);
+       err = snd_ctl_add(emu->card, kctl);
+       if (err < 0)
+               return err;
 
        snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV, 
snd_dma_pci_data(emu->pci), 64*1024, 64*1024);