linux-kernel - [PATCH 1/3] Return ENODEV instead of EINVAL when trying to open ACM device.

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Message-Id: <1245879211-10130-1-git-send-email-cascardo@holoscopio.com>
Date:	Wed, 24 Jun 2009 18:33:29 -0300
From:	Thadeu Lima de Souza Cascardo <cascardo@...oscopio.com>
To:	linux-kernel@...r.kernel.org
Cc:	alan@...rguk.ukuu.org.uk, gregkh@...e.de,
	linux-usb@...r.kernel.org, oliver@...kum.name,
	Thadeu Lima de Souza Cascardo <cascardo@...oscopio.com>
Subject: [PATCH 1/3] Return ENODEV instead of EINVAL when trying to open ACM device.

This is required, otherwise a user will get a EINVAL while opening a
non-existing device, instead of ENODEV.

This is what I get with this patch applied now instead of an "Invalid
argument".

cascardo@...pa:~$ cat /dev/ttyACM0
cat: /dev/ttyACM0: No such device
cascardo@...pa:~$

Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@...oscopio.com>
---
 drivers/usb/class/cdc-acm.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 38bfdb0..02eb60b 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -550,7 +550,7 @@ static void acm_waker(struct work_struct *waker)
 static int acm_tty_open(struct tty_struct *tty, struct file *filp)
 {
 	struct acm *acm;
-	int rv = -EINVAL;
+	int rv = -ENODEV;
 	int i;
 	dbg("Entering acm_tty_open.");
 
-- 
1.6.3

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