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From: Hans Petter Selasky <hselasky@FreeBSD.org>
Date: Fri, 8 Apr 2011 06:37:22 +0000 (UTC)
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Subject: svn commit: r220439 - stable/8/sys/dev/usb
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Author: hselasky
Date: Fri Apr  8 06:37:22 2011
New Revision: 220439
URL: http://svn.freebsd.org/changeset/base/220439

Log:
  MFC r220304.
  - Fix for missing event if a libUSB USB transfer is started and
    stopped rapidly in succession.

Modified:
  stable/8/sys/dev/usb/usb_generic.c
Directory Properties:
  stable/8/sys/   (props changed)
  stable/8/sys/amd64/include/xen/   (props changed)
  stable/8/sys/cddl/contrib/opensolaris/   (props changed)
  stable/8/sys/contrib/dev/acpica/   (props changed)
  stable/8/sys/contrib/pf/   (props changed)

Modified: stable/8/sys/dev/usb/usb_generic.c
==============================================================================
--- stable/8/sys/dev/usb/usb_generic.c	Fri Apr  8 06:29:41 2011	(r220438)
+++ stable/8/sys/dev/usb/usb_generic.c	Fri Apr  8 06:37:22 2011	(r220439)
@@ -1400,6 +1400,7 @@ ugen_ioctl(struct usb_fifo *f, u_long cm
 	}     u;
 	struct usb_endpoint *ep;
 	struct usb_endpoint_descriptor *ed;
+	struct usb_xfer *xfer;
 	int error = 0;
 	uint8_t iface_index;
 	uint8_t isread;
@@ -1426,11 +1427,11 @@ ugen_ioctl(struct usb_fifo *f, u_long cm
 
 	case USB_FS_START:
 		error = ugen_fs_copy_in(f, u.pstart->ep_index);
-		if (error) {
+		if (error)
 			break;
-		}
 		mtx_lock(f->priv_mtx);
-		usbd_transfer_start(f->fs_xfer[u.pstart->ep_index]);
+		xfer = f->fs_xfer[u.pstart->ep_index];
+		usbd_transfer_start(xfer);
 		mtx_unlock(f->priv_mtx);
 		break;
 
@@ -1440,7 +1441,19 @@ ugen_ioctl(struct usb_fifo *f, u_long cm
 			break;
 		}
 		mtx_lock(f->priv_mtx);
-		usbd_transfer_stop(f->fs_xfer[u.pstop->ep_index]);
+		xfer = f->fs_xfer[u.pstart->ep_index];
+		if (usbd_transfer_pending(xfer)) {
+			usbd_transfer_stop(xfer);
+			/*
+			 * Check if the USB transfer was stopped
+			 * before it was even started. Else a cancel
+			 * callback will be pending.
+			 */
+			if (!xfer->flags_int.transferring) {
+				ugen_fs_set_complete(xfer->priv_sc,
+				    USB_P2U(xfer->priv_fifo));
+			}
+		}
 		mtx_unlock(f->priv_mtx);
 		break;