Fix how libusb20_dev_kernel_driver_active() and

libusb_dev_kernel_driver_active() works. In case of
libusb20 the manpage was wrong and in case of
libusb10 the implementation was wrong.

Submitted by:	Kai Wang
MFC after:	3 days

3 files changed, 8 insertions, 8 deletions

diff --git a/lib/libusb/libusb.3 b/lib/libusb/libusb.3
index b69922e..7255f2b 100644
--- a/lib/libusb/libusb.3
+++ b/lib/libusb/libusb.3
@@ -223,8 +223,8 @@ code on failure.
 .Ft int
 .Fn libusb_kernel_driver_active "libusb_device_handle *devh" "int interface"
 Determine if a driver is active on a interface.
-Returns 0 if no kernel driver
-is active, 1 if a kernel driver is active, LIBUSB_ERROR_NO_DEVICE
+Returns 0 if no kernel driver is active
+and 1 if a kernel driver is active, LIBUSB_ERROR_NO_DEVICE
 if the device has been disconnected and a LIBUSB_ERROR code on failure.
 .Pp
 .Ft int
diff --git a/lib/libusb/libusb10.c b/lib/libusb/libusb10.c
index e02b90a..0a7c1e6 100644
--- a/lib/libusb/libusb10.c
+++ b/lib/libusb/libusb10.c
@@ -216,7 +216,6 @@ libusb_get_device_list(libusb_context *ctx, libusb_device ***list)
 			libusb20_be_free(usb_backend);
 			return (LIBUSB_ERROR_NO_MEM);
 		}
-
 		/* get device into libUSB v1.0 list */
 		libusb20_be_dequeue_device(usb_backend, pdev);
 
@@ -718,8 +717,10 @@ libusb_kernel_driver_active(struct libusb20_device *pdev, int interface)
 	if (pdev == NULL)
 		return (LIBUSB_ERROR_INVALID_PARAM);
 
-	return (libusb20_dev_kernel_driver_active(
-	    pdev, interface));
+	if (libusb20_dev_kernel_driver_active(pdev, interface))
+		return (0);		/* no kernel driver is active */
+	else
+		return (1);		/* kernel driver is active */
 }
 
 int
diff --git a/lib/libusb/libusb20.3 b/lib/libusb/libusb20.3
index b41bec1..bd167b2 100644
--- a/lib/libusb/libusb20.3
+++ b/lib/libusb/libusb20.3
@@ -614,10 +614,9 @@ The file descriptor can be used for polling purposes.
 .Pp
 .
 .Fn libusb20_dev_kernel_driver_active
-returns a non-zero value if a kernel driver is active on
-the given USB interface.
+returns zero if a kernel driver is active on the given USB interface.
 .
-Else zero is returned.
+Else a LIBUSB20_ERROR value is returned.
 .
 .Pp
 .