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drivers: uio: Fix UIO device registration failure

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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>
This commit is contained in:
Damian Hobson-Garcia 2013-03-26 10:31:22 +09:00 committed by Greg Kroah-Hartman
parent 7f4f2302a1
commit 5ed0505c71
1 changed files with 1 additions and 0 deletions
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drivers/uio/uio.c
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@ -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;