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authorTakashi Iwai <tiwai@suse.de>2019-08-15 11:41:06 +0200
committerTakashi Iwai <tiwai@suse.de>2019-08-21 08:19:30 +0200
commit6de3c9e3f6b3eaf66859e1379b3f35dda781416b (patch)
treeee0a893af2cdbb736ec537e8cbb76732f7981a1c /sound/usb
parent2ca371d847511f97ef991ef612a2ce805489840e (diff)
downloadlinux-6de3c9e3f6b3eaf66859e1379b3f35dda781416b.tar.bz2
ALSA: usb-audio: Fix invalid NULL check in snd_emuusb_set_samplerate()
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>
Diffstat (limited to 'sound/usb')
-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 199fa157a411..27dcb3743690 100644
--- a/sound/usb/mixer_quirks.c
+++ b/sound/usb/mixer_quirks.c
@@ -1155,17 +1155,17 @@ 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;
}
}