USB: cdc-wdm cleanup

- fixes an error with filling out control requests
- increases grepability and error logging
- fixes the short read code path

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 10 insertions, 6 deletions

diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c
index 731db051070a..3a656f8f9935 100644
--- a/drivers/usb/class/cdc-wdm.c
+++ b/drivers/usb/class/cdc-wdm.c
@@ -28,8 +28,9 @@
 /*
  * Version Information
  */
-#define DRIVER_VERSION "v0.02"
+#define DRIVER_VERSION "v0.03"
 #define DRIVER_AUTHOR "Oliver Neukum"
+#define DRIVER_DESC "USB Abstract Control Model driver for USB WCM Device Management"
 
 static struct usb_device_id wdm_ids[] = {
         {
@@ -205,7 +206,7 @@ static void wdm_int_callback(struct urb *urb)
         req->bRequest = USB_CDC_GET_ENCAPSULATED_RESPONSE;
         req->wValue = 0;
         req->wIndex = desc->inum;
-        req->wLength = cpu_to_le16(desc->bMaxPacketSize0);
+        req->wLength = cpu_to_le16(desc->wMaxCommand);
 
         usb_fill_control_urb(
                 desc->response,
@@ -214,7 +215,7 @@ static void wdm_int_callback(struct urb *urb)
                 usb_rcvctrlpipe(interface_to_usbdev(desc->intf), 0),
                 (unsigned char *)req,
                 desc->inbuf,
-                desc->bMaxPacketSize0,
+                desc->wMaxCommand,
                 wdm_in_callback,
                 desc
         );
@@ -266,7 +267,7 @@ static void cleanup(struct wdm_device *desc)
                         desc->sbuf,
                         desc->validity->transfer_dma);
         usb_buffer_free(interface_to_usbdev(desc->intf),
-                        desc->wMaxPacketSize,
+                        desc->wMaxCommand,
                         desc->inbuf,
                         desc->response->transfer_dma);
         kfree(desc->orq);
@@ -347,6 +348,7 @@ static ssize_t wdm_write
         if (rv < 0) {
                 kfree(buf);
                 clear_bit(WDM_IN_USE, &desc->flags);
+                err("Tx URB error: %d", rv);
         } else {
                 dev_dbg(&desc->intf->dev, "Tx URB has been submitted index=%d",
                         req->wIndex);
@@ -418,6 +420,9 @@ retry:
                 desc->ubuf[i] = desc->ubuf[i + cntr];
 
         desc->length -= cntr;
+        /* in case we had outstanding data */
+        if (!desc->length)
+                clear_bit(WDM_READ, &desc->flags);
         rv = cntr;
 
 err:
@@ -735,6 +740,5 @@ module_init(wdm_init);
 module_exit(wdm_exit);
 
 MODULE_AUTHOR(DRIVER_AUTHOR);
-MODULE_DESCRIPTION("USB Abstract Control Model driver for "
-                   "USB WCM Device Management");
+MODULE_DESCRIPTION(DRIVER_DESC);
 MODULE_LICENSE("GPL");