ChangeSet 1.1867.3.9, 2004/09/14 11:58:23-07:00, [EMAIL PROTECTED]
[PATCH] USB: acm work around for misplaced
this implements a work around for some devices which have correct
extra descriptors, but misplace them.
Signed-Off-By: Oliver Neukum <[EMAIL PROTECTED]>
Signed-off-by: Greg Kroah-Hartman <[EMAIL PROTECTED]>
drivers/usb/class/cdc-acm.c | 11 +++++++++++
1 files changed, 11 insertions(+)
diff -Nru a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
--- a/drivers/usb/class/cdc-acm.c 2004-10-19 08:13:42 -07:00
+++ b/drivers/usb/class/cdc-acm.c 2004-10-19 08:13:42 -07:00
@@ -547,6 +547,17 @@
return -EINVAL;
}
+ if (!buflen) {
+ if (intf->cur_altsetting->endpoint->extralen &&
intf->cur_altsetting->endpoint->extra) {
+ dev_dbg(&intf->dev,"Seeking extra descriptors on endpoint");
+ buflen = intf->cur_altsetting->endpoint->extralen;
+ buffer = intf->cur_altsetting->endpoint->extra;
+ } else {
+ err("Zero length descriptor references");
+ return -EINVAL;
+ }
+ }
+
while (buflen > 0) {
if (buffer [1] != USB_DT_CS_INTERFACE) {
err("skipping garbage");
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