ALSA: line6: Always setup isochronous transfer properties

While not all line6 devices currently support PCM, it causes no
harm to 'have it prepared'.

This also fixes toneport, which only has PCM - in which case
we previously skipped the USB transfer properties detection completely.

Signed-off-by: Andrej Krutak <dev@andree.sk>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 26 insertions, 22 deletions

diff --git a/sound/usb/line6/driver.c b/sound/usb/line6/driver.c
index ab3c280a23d1..0ff5a7d2e19f 100644
--- a/sound/usb/line6/driver.c
+++ b/sound/usb/line6/driver.c
@@ -492,42 +492,46 @@ static void line6_destruct(struct snd_card *card)
         usb_put_dev(usbdev);
 }
 
-/* get data from endpoint descriptor (see usb_maxpacket): */
-static void line6_get_interval(struct usb_line6 *line6)
+static void line6_get_usb_properties(struct usb_line6 *line6)
 {
         struct usb_device *usbdev = line6->usbdev;
         const struct line6_properties *properties = line6->properties;
         int pipe;
-        struct usb_host_endpoint *ep;
+        struct usb_host_endpoint *ep = NULL;
 
-        if (properties->capabilities & LINE6_CAP_CONTROL_MIDI) {
-                pipe =
-                        usb_rcvintpipe(line6->usbdev, line6->properties->ep_ctrl_r);
-        } else {
-                pipe =
-                        usb_rcvbulkpipe(line6->usbdev, line6->properties->ep_ctrl_r);
+        if (properties->capabilities & LINE6_CAP_CONTROL) {
+                if (properties->capabilities & LINE6_CAP_CONTROL_MIDI) {
+                        pipe = usb_rcvintpipe(line6->usbdev,
+                                line6->properties->ep_ctrl_r);
+                } else {
+                        pipe = usb_rcvbulkpipe(line6->usbdev,
+                                line6->properties->ep_ctrl_r);
+                }
+                ep = usbdev->ep_in[usb_pipeendpoint(pipe)];
         }
-        ep = usbdev->ep_in[usb_pipeendpoint(pipe)];
 
+        /* Control data transfer properties */
         if (ep) {
                 line6->interval = ep->desc.bInterval;
-                if (usbdev->speed == USB_SPEED_LOW) {
-                        line6->intervals_per_second = USB_LOW_INTERVALS_PER_SECOND;
-                        line6->iso_buffers = USB_LOW_ISO_BUFFERS;
-                } else {
-                        line6->intervals_per_second = USB_HIGH_INTERVALS_PER_SECOND;
-                        line6->iso_buffers = USB_HIGH_ISO_BUFFERS;
-                }
-
                 line6->max_packet_size = le16_to_cpu(ep->desc.wMaxPacketSize);
         } else {
-                dev_err(line6->ifcdev,
-                        "endpoint not available, using fallback values");
+                if (properties->capabilities & LINE6_CAP_CONTROL) {
+                        dev_err(line6->ifcdev,
+                                "endpoint not available, using fallback values");
+                }
                 line6->interval = LINE6_FALLBACK_INTERVAL;
                 line6->max_packet_size = LINE6_FALLBACK_MAXPACKETSIZE;
         }
-}
 
+        /* Isochronous transfer properties */
+        if (usbdev->speed == USB_SPEED_LOW) {
+                line6->intervals_per_second = USB_LOW_INTERVALS_PER_SECOND;
+                line6->iso_buffers = USB_LOW_ISO_BUFFERS;
+        } else {
+                line6->intervals_per_second = USB_HIGH_INTERVALS_PER_SECOND;
+                line6->iso_buffers = USB_HIGH_ISO_BUFFERS;
+        }
+}
 
 /* Enable buffering of incoming messages, flush the buffer */
 static int line6_hwdep_open(struct snd_hwdep *hw, struct file *file)
@@ -754,7 +758,7 @@ int line6_probe(struct usb_interface *interface,
                 goto error;
         }
 
-        line6_get_interval(line6);
+        line6_get_usb_properties(line6);
 
         if (properties->capabilities & LINE6_CAP_CONTROL) {
                 ret = line6_init_cap_control(line6);