This patch is similar to commit 1762a59d8e8b5e99f6f4a0f292b40f3cacb108ba.
The same non-standard interface descriptor causes snd_usb_create_mixer()
to fail for the Focusrite Scarlett 18i8 as well.

Signed-off-by: Chris J Arges <christopherar...@gmail.com>
---
 sound/usb/quirks-table.h |   46 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/sound/usb/quirks-table.h b/sound/usb/quirks-table.h
index 7f1585b..b954ec5 100644
--- a/sound/usb/quirks-table.h
+++ b/sound/usb/quirks-table.h
@@ -3232,6 +3232,52 @@ YAMAHA_DEVICE(0x7010, "UB99"),
                }
        }
 },
+{
+       /*
+        * Focusrite Scarlett 18i8
+        *
+        * Avoid mixer creation similar to the Scarlett 18i6 interface.
+        */
+       USB_DEVICE(0x1235, 0x8014),
+       .driver_info = (unsigned long) & (const struct snd_usb_audio_quirk) {
+               .vendor_name = "Focusrite",
+               .product_name = "Scarlett 18i8",
+               .ifnum = QUIRK_ANY_INTERFACE,
+               .type = QUIRK_COMPOSITE,
+               .data = & (const struct snd_usb_audio_quirk[]) {
+                       {
+                               /* InterfaceSubClass 1 (Control Device) */
+                               .ifnum = 0,
+                               .type = QUIRK_IGNORE_INTERFACE
+                       },
+                       {
+                               .ifnum = 1,
+                               .type = QUIRK_AUDIO_STANDARD_INTERFACE
+                       },
+                       {
+                               .ifnum = 2,
+                               .type = QUIRK_AUDIO_STANDARD_INTERFACE
+                       },
+                       {
+                               /* InterfaceSubClass 1 (Control Device) */
+                               .ifnum = 3,
+                               .type = QUIRK_IGNORE_INTERFACE
+                       },
+                       {
+                               .ifnum = 4,
+                               .type = QUIRK_MIDI_STANDARD_INTERFACE
+                       },
+                       {
+                               /* InterfaceSubClass 1 (Device Firmware Update) 
*/
+                               .ifnum = 5,
+                               .type = QUIRK_IGNORE_INTERFACE
+                       },
+                       {
+                               .ifnum = -1
+                       }
+               }
+       }
+},
 
 {
        /*
-- 
1.7.9.5

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