linux-kernel - [PATCH 1/5] drivers:tty:fix up ENOIOCTLCMD error handling

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Date:	Mon, 27 Aug 2012 15:23:12 +0800
From:	Wanlong Gao <gaowanlong@...fujitsu.com>
To:	linux-kernel@...r.kernel.org
Cc:	Wanlong Gao <gaowanlong@...fujitsu.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH 1/5] drivers:tty:fix up ENOIOCTLCMD error handling

At commit 07d106d0, Linus pointed out that ENOIOCTLCMD should be
translated as ENOTTY to user mode.
For example:
	fd = open("/dev/tty", O_RDWR);
	ioctl(fd, -1, &argp);

then the errno should be ENOTTY but not EINVAL.

Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Wanlong Gao <gaowanlong@...fujitsu.com>
---
 drivers/tty/tty_io.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index b425c79..720c408f 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -2756,7 +2756,7 @@ long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 	if (ld->ops->ioctl) {
 		retval = ld->ops->ioctl(tty, file, cmd, arg);
 		if (retval == -ENOIOCTLCMD)
-			retval = -EINVAL;
+			retval = -ENOTTY;
 	}
 	tty_ldisc_deref(ld);
 	return retval;
-- 
1.7.12

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