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

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Date:	Wed, 24 Jun 2009 18:19:25 -0300
From:	Thadeu Lima de Souza Cascardo <cascardo@...oscopio.com>
To:	Oliver Neukum <oliver@...kum.org>
Cc:	Greg KH <gregkh@...e.de>, linux-kernel@...r.kernel.org,
	alan@...rguk.ukuu.org.uk, linux-usb@...r.kernel.org
Subject: Re: [PATCH 1/3] Return ENODEV instead of EINVAL when trying to
	open ACM device.

On Wed, Jun 24, 2009 at 11:17:04PM +0200, Oliver Neukum wrote:
> Am Mittwoch, 24. Juni 2009 22:40:15 schrieb Greg KH:
> > On Wed, Jun 24, 2009 at 08:31:15AM -0300, Thadeu Lima de Souza Cascardo wrote:
> > > 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;
> >
> > Why is this needed?
> 
> The current error return is incorrect. If the table entry is gone, the
> device has been disconnected, hence -ENODEV.
> 
> 	Regards
> 		Oliver
> Acked-by: Oliver Neukum <oliver@...kum.org>
> 

Or if the device has never been connected at all.

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