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path: root/drivers/usb/serial/keyspan.c
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Diffstat (limited to 'drivers/usb/serial/keyspan.c')
-rw-r--r--drivers/usb/serial/keyspan.c49
1 files changed, 45 insertions, 4 deletions
diff --git a/drivers/usb/serial/keyspan.c b/drivers/usb/serial/keyspan.c
index 9d2fdfd6865..e6966f12ed5 100644
--- a/drivers/usb/serial/keyspan.c
+++ b/drivers/usb/serial/keyspan.c
@@ -1275,11 +1275,31 @@ static int keyspan_fake_startup (struct usb_serial *serial)
}
/* Helper functions used by keyspan_setup_urbs */
+static struct usb_endpoint_descriptor const *find_ep(struct usb_serial const *serial,
+ int endpoint)
+{
+ struct usb_host_interface *iface_desc;
+ struct usb_endpoint_descriptor *ep;
+ int i;
+
+ iface_desc = serial->interface->cur_altsetting;
+ for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
+ ep = &iface_desc->endpoint[i].desc;
+ if (ep->bEndpointAddress == endpoint)
+ return ep;
+ }
+ dev_warn(&serial->interface->dev, "found no endpoint descriptor for "
+ "endpoint %x\n", endpoint);
+ return NULL;
+}
+
static struct urb *keyspan_setup_urb (struct usb_serial *serial, int endpoint,
int dir, void *ctx, char *buf, int len,
void (*callback)(struct urb *))
{
struct urb *urb;
+ struct usb_endpoint_descriptor const *ep_desc;
+ char const *ep_type_name;
if (endpoint == -1)
return NULL; /* endpoint not needed */
@@ -1291,11 +1311,32 @@ static struct urb *keyspan_setup_urb (struct usb_serial *serial, int endpoint,
return NULL;
}
- /* Fill URB using supplied data. */
- usb_fill_bulk_urb(urb, serial->dev,
- usb_sndbulkpipe(serial->dev, endpoint) | dir,
- buf, len, callback, ctx);
+ ep_desc = find_ep(serial, endpoint);
+ if (!ep_desc) {
+ /* leak the urb, something's wrong and the callers don't care */
+ return urb;
+ }
+ if (usb_endpoint_xfer_int(ep_desc)) {
+ ep_type_name = "INT";
+ usb_fill_int_urb(urb, serial->dev,
+ usb_sndintpipe(serial->dev, endpoint) | dir,
+ buf, len, callback, ctx,
+ ep_desc->bInterval);
+ } else if (usb_endpoint_xfer_bulk(ep_desc)) {
+ ep_type_name = "BULK";
+ usb_fill_bulk_urb(urb, serial->dev,
+ usb_sndbulkpipe(serial->dev, endpoint) | dir,
+ buf, len, callback, ctx);
+ } else {
+ dev_warn(&serial->interface->dev,
+ "unsupported endpoint type %x\n",
+ ep_desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK);
+ usb_free_urb(urb);
+ return NULL;
+ }
+ dbg("%s - using urb %p for %s endpoint %x",
+ __func__, urb, ep_type_name, endpoint);
return urb;
}