USB: cdc-acm: work around some broken devices

This patch introduces a work around for cdc-acm devices which are
low speed contrary to the specification, which requires bulk endpoints
which are banned in low speed and converted by usbcore to virtual
interrupt endpoints if they are used nevertheless.

Signed-off-by: Arseniy Lartsev <ars3n@yandex.ru>
Cc: Oliver Neukum <oliver@neukum.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 3f1045993474ce9ea9474920b870d6d75f6a1a15..5b15d9d8896b9b0efe08a7d44303486e6f290811 100644 (file)
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -387,6 +387,7 @@ static void acm_rx_tasklet(unsigned long _acm)
        struct acm_ru *rcv;
        unsigned long flags;
        unsigned char throttled;
+       struct usb_host_endpoint *ep;
 
        dbg("Entering acm_rx_tasklet");
 
@@ -462,11 +463,20 @@ urbs:
 
                rcv->buffer = buf;
 
-               usb_fill_bulk_urb(rcv->urb, acm->dev,
-                                 acm->rx_endpoint,
-                                 buf->base,
-                                 acm->readsize,
-                                 acm_read_bulk, rcv);
+               ep = (usb_pipein(acm->rx_endpoint) ? acm->dev->ep_in : acm->dev->ep_out)
+                               [usb_pipeendpoint(acm->rx_endpoint)];
+               if (usb_endpoint_xfer_int(&ep->desc))
+                       usb_fill_int_urb(rcv->urb, acm->dev,
+                                        acm->rx_endpoint,
+                                        buf->base,
+                                        acm->readsize,
+                                        acm_read_bulk, rcv, ep->desc.bInterval);
+               else
+                       usb_fill_bulk_urb(rcv->urb, acm->dev,
+                                         acm->rx_endpoint,
+                                         buf->base,
+                                         acm->readsize,
+                                         acm_read_bulk, rcv);
                rcv->urb->transfer_dma = buf->dma;
                rcv->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 
@@ -1227,9 +1237,14 @@ made_compressed_probe:
                        goto alloc_fail7;
                }
 
-               usb_fill_bulk_urb(snd->urb, usb_dev,
-                       usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
-                       NULL, acm->writesize, acm_write_bulk, snd);
+               if (usb_endpoint_xfer_int(epwrite))
+                       usb_fill_int_urb(snd->urb, usb_dev,
+                               usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
+                               NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
+               else
+                       usb_fill_bulk_urb(snd->urb, usb_dev,
+                               usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
+                               NULL, acm->writesize, acm_write_bulk, snd);
                snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
                snd->instance = acm;
        }