linux-kernel - [PATCH] tty/vt: Return EBUSY if deallocating VT1 and it is busy

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Message-Id: <1371248665-1176-1-git-send-email-rosslagerwall@gmail.com>
Date:	Fri, 14 Jun 2013 23:24:25 +0100
From:	Ross Lagerwall <rosslagerwall@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Dave Jones <davej@...hat.com>,
	Peter Hurley <peter@...leysoftware.com>,
	linux-serial@...r.kernel.org, Greg KH <gregkh@...uxfoundation.org>,
	Ross Lagerwall <rosslagerwall@...il.com>
Subject: [PATCH] tty/vt: Return EBUSY if deallocating VT1 and it is busy

Commit 421b40a6286e ("tty/vt: Fix vc_deallocate() lock order") changed
the behavior when deallocating VT 1.  Previously if trying to
deallocate VT1 and it is busy, we would return EBUSY.  The commit
changed this to return 0 (success).

This commit restores the old behavior.

Signed-off-by: Ross Lagerwall <rosslagerwall@...il.com>
---
On 06/14/2013 05:35 PM, Greg KH wrote:
> p.s. In the future, please cc: the people who handled the patch you are
> asking about, otherwise stuff like this often gets missed in the noise
> of lkml.

Yes, sorry about that.  I only remembered after I sent the email.

 drivers/tty/vt/vt_ioctl.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/tty/vt/vt_ioctl.c b/drivers/tty/vt/vt_ioctl.c
index fc2c06c..2bd78e2 100644
--- a/drivers/tty/vt/vt_ioctl.c
+++ b/drivers/tty/vt/vt_ioctl.c
@@ -289,13 +289,10 @@ static int vt_disallocate(unsigned int vc_num)
 	struct vc_data *vc = NULL;
 	int ret = 0;
 
-	if (!vc_num)
-		return 0;
-
 	console_lock();
 	if (VT_BUSY(vc_num))
 		ret = -EBUSY;
-	else
+	else if (vc_num)
 		vc = vc_deallocate(vc_num);
 	console_unlock();
 
-- 
1.8.3.1

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