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authorTakashi Iwai <tiwai@suse.de>2019-08-15 11:41:06 +0200
committerSasha Levin <sashal@kernel.org>2020-06-29 20:08:05 -0400
commitd9ed57ecc2947abcf5a8226b34e0634a8fe77692 (patch)
tree3f86710367b79d0f6f485b9e5e9657b7baee1487
parent7f9d01a3dac7a5b9ef2b80d1c7049c25743cd661 (diff)
ALSA: usb-audio: Fix invalid NULL check in snd_emuusb_set_samplerate()
commit 6de3c9e3f6b3eaf66859e1379b3f35dda781416b upstream. The quirk function snd_emuusb_set_samplerate() has a NULL check for the mixer element, but this is useless in the current code. It used to be a check against mixer->id_elems[unitid] but it was changed later to the value after mixer_eleme_list_to_info() which is always non-NULL due to the container_of() usage. This patch fixes the check before the conversion. While we're at it, correct a typo in the comment in the function, too. Fixes: 8c558076c740 ("ALSA: usb-audio: Clean up mixer element list traverse") Cc: <stable@vger.kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--sound/usb/mixer_quirks.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/sound/usb/mixer_quirks.c b/sound/usb/mixer_quirks.c
index 198515f86fcc..9646513f4b4a 100644
--- a/sound/usb/mixer_quirks.c
+++ b/sound/usb/mixer_quirks.c
@@ -1168,17 +1168,17 @@ void snd_emuusb_set_samplerate(struct snd_usb_audio *chip,
{
struct usb_mixer_interface *mixer;
struct usb_mixer_elem_info *cval;
- int unitid = 12; /* SamleRate ExtensionUnit ID */
+ int unitid = 12; /* SampleRate ExtensionUnit ID */
list_for_each_entry(mixer, &chip->mixer_list, list) {
- cval = mixer_elem_list_to_info(mixer->id_elems[unitid]);
- if (cval) {
+ if (mixer->id_elems[unitid]) {
+ cval = mixer_elem_list_to_info(mixer->id_elems[unitid]);
snd_usb_mixer_set_ctl_value(cval, UAC_SET_CUR,
cval->control << 8,
samplerate_id);
snd_usb_mixer_notify_id(mixer, unitid);
+ break;
}
- break;
}
}