[ALSA] usb-audio: add workaround for CSR Bluetooth Headphones (Saitek A-250)
Some devices don't have the required class-specific endpoint descriptors.
Instead of making this case an error, this patch makes the driver guess the
endpoint attributes.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c
index 8100516..770642a 100644
--- a/sound/usb/usbaudio.c
+++ b/sound/usb/usbaudio.c
@@ -2627,9 +2627,10 @@
if (!csep && altsd->bNumEndpoints >= 2)
csep = snd_usb_find_desc(alts->endpoint[1].extra, alts->endpoint[1].extralen, NULL, USB_DT_CS_ENDPOINT);
if (!csep || csep[0] < 7 || csep[2] != EP_GENERAL) {
- snd_printk(KERN_ERR "%d:%u:%d : no or invalid class specific endpoint descriptor\n",
+ snd_printk(KERN_WARN "%d:%u:%d : no or invalid"
+ " class specific endpoint descriptor\n",
dev->devnum, iface_no, altno);
- continue;
+ csep = NULL;
}
fp = kmalloc(sizeof(*fp), GFP_KERNEL);
@@ -2648,7 +2649,7 @@
if (snd_usb_get_speed(dev) == USB_SPEED_HIGH)
fp->maxpacksize = (((fp->maxpacksize >> 11) & 3) + 1)
* (fp->maxpacksize & 0x7ff);
- fp->attributes = csep[3];
+ fp->attributes = csep ? csep[3] : 0;
/* some quirks for attributes here */
