linux-kernel - [ 93/95] drivers: uio: Fix UIO device registration failure

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Message-Id: <20130625182204.176739943@linuxfoundation.org>
Date:	Tue, 25 Jun 2013 11:33:20 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Damian Hobson-Garcia <dhobsong@...l.co.jp>,
	"Hans J. Koch" <hjk@...sjkoch.de>,
	Guenter Roeck <linux@...ck-us.net>
Subject: [ 93/95] drivers: uio: Fix UIO device registration failure

3.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Damian Hobson-Garcia <dhobsong@...l.co.jp>

commit 5ed0505c713805f89473cdc0bbfb5110dfd840cb upstream.

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.

Signed-off-by: Damian Hobson-Garcia <dhobsong@...l.co.jp>
Cc: "Hans J. Koch" <hjk@...sjkoch.de>
Cc: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/uio/uio.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -374,6 +374,7 @@ static int uio_get_minor(struct uio_devi
 	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;

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