drivers: uio: Fix UIO device registration failure

Until recently uio_get_minor() returned 0 for success and
a negative value on failure.  This became non-negative for suceess and
negative for failure.  Restore the original return value spec so that we can
successfully initialize UIO devices with a non-zero minor device
number.

Cc: "Hans J. Koch" <hjk@hansjkoch.de>
Signed-off-by: Damian Hobson-Garcia <dhobsong@igel.co.jp>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
index c8b926291e28..b645c47501b4 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -374,6 +374,7 @@ static int uio_get_minor(struct uio_device *idev)
         retval = idr_alloc(&uio_idr, idev, 0, UIO_MAX_DEVICES, GFP_KERNEL);
         if (retval >= 0) {
                 idev->minor = retval;
+                retval = 0;
         } else if (retval == -ENOSPC) {
                 dev_err(idev->dev, "too many uio devices\n");
                 retval = -EINVAL;