1 files changed, 14 insertions, 9 deletions

diff --git a/sound/usb/stream.c b/sound/usb/stream.c
index ad181d538bd9..7db2f8958e79 100644
--- a/sound/usb/stream.c
+++ b/sound/usb/stream.c
@@ -42,12 +42,11 @@
  */
 static void free_substream(struct snd_usb_substream *subs)
 {
-        struct list_head *p, *n;
+        struct audioformat *fp, *n;
 
         if (!subs->num_formats)
                 return; /* not initialized */
-        list_for_each_safe(p, n, &subs->fmt_list) {
-                struct audioformat *fp = list_entry(p, struct audioformat, list);
+        list_for_each_entry_safe(fp, n, &subs->fmt_list, list) {
                 kfree(fp->rate_table);
                 kfree(fp->chmap);
                 kfree(fp);
@@ -94,6 +93,7 @@ static void snd_usb_init_substream(struct snd_usb_stream *as,
         subs->dev = as->chip->dev;
         subs->txfr_quirk = as->chip->txfr_quirk;
         subs->speed = snd_usb_get_speed(subs->dev);
+        subs->pkt_offset_adj = 0;
 
         snd_usb_set_pcm_ops(as->pcm, stream);
 
@@ -313,14 +313,12 @@ int snd_usb_add_audio_stream(struct snd_usb_audio *chip,
                              int stream,
                              struct audioformat *fp)
 {
-        struct list_head *p;
         struct snd_usb_stream *as;
         struct snd_usb_substream *subs;
         struct snd_pcm *pcm;
         int err;
 
-        list_for_each(p, &chip->pcm_list) {
-                as = list_entry(p, struct snd_usb_stream, list);
+        list_for_each_entry(as, &chip->pcm_list, list) {
                 if (as->fmt_type != fp->fmt_type)
                         continue;
                 subs = &as->substream[stream];
@@ -332,8 +330,7 @@ int snd_usb_add_audio_stream(struct snd_usb_audio *chip,
                 }
         }
         /* look for an empty stream */
-        list_for_each(p, &chip->pcm_list) {
-                as = list_entry(p, struct snd_usb_stream, list);
+        list_for_each_entry(as, &chip->pcm_list, list) {
                 if (as->fmt_type != fp->fmt_type)
                         continue;
                 subs = &as->substream[stream];
@@ -396,6 +393,14 @@ static int parse_uac_endpoint_attributes(struct snd_usb_audio *chip,
         if (!csep && altsd->bNumEndpoints >= 2)
                 csep = snd_usb_find_desc(alts->endpoint[1].extra, alts->endpoint[1].extralen, NULL, USB_DT_CS_ENDPOINT);
 
+        /*
+         * If we can't locate the USB_DT_CS_ENDPOINT descriptor in the extra
+         * bytes after the first endpoint, go search the entire interface.
+         * Some devices have it directly *before* the standard endpoint.
+         */
+        if (!csep)
+                csep = snd_usb_find_desc(alts->extra, alts->extralen, NULL, USB_DT_CS_ENDPOINT);
+
         if (!csep || csep->bLength < 7 ||
             csep->bDescriptorSubtype != UAC_EP_GENERAL) {
                 snd_printk(KERN_WARNING "%d:%u:%d : no or invalid"
@@ -463,7 +468,7 @@ int snd_usb_parse_audio_interface(struct snd_usb_audio *chip, int iface_no)
         struct usb_host_interface *alts;
         struct usb_interface_descriptor *altsd;
         int i, altno, err, stream;
-        int format = 0, num_channels = 0;
+        unsigned int format = 0, num_channels = 0;
         struct audioformat *fp = NULL;
         int num, protocol, clock = 0;
         struct uac_format_type_i_continuous_descriptor *fmt;