linux-kernel - Re: [PATCH 1/2] TTY: ldisc, fix open flag handling

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Message-ID: <20101129215030.GC9830@kroah.com>
Date:	Mon, 29 Nov 2010 13:50:30 -0800
From:	Greg KH <greg@...ah.com>
To:	Jiri Slaby <jslaby@...e.cz>
Cc:	gregkh@...e.de, slapin@...fans.org, linux-kernel@...r.kernel.org,
	jirislaby@...il.com, Alan Cox <alan@...ux.intel.com>
Subject: Re: [PATCH 1/2] TTY: ldisc, fix open flag handling

On Thu, Nov 25, 2010 at 12:27:54AM +0100, Jiri Slaby wrote:
> When a concrete ldisc open fails in tty_ldisc_open, we forget to clear
> TTY_LDISC_OPEN. This causes a false warning on the next ldisc open:
> WARNING: at drivers/char/tty_ldisc.c:445 tty_ldisc_open+0x26/0x38()
> Hardware name: System Product Name
> Modules linked in: ...
> Pid: 5251, comm: a.out Tainted: G        W  2.6.32-5-686 #1
> Call Trace:
>  [<c1030321>] ? warn_slowpath_common+0x5e/0x8a
>  [<c1030357>] ? warn_slowpath_null+0xa/0xc
>  [<c119311c>] ? tty_ldisc_open+0x26/0x38
>  [<c11936c5>] ? tty_set_ldisc+0x218/0x304
> ...
> 
> So clear the bit when failing...
> 
> Introduced in c65c9bc3efa (tty: rewrite the ldisc locking) back in
> 2.6.31-rc1.
> 
> Signed-off-by: Jiri Slaby <jslaby@...e.cz>
> Cc: Alan Cox <alan@...ux.intel.com>
> Reported-by: Sergey Lapin <slapin@...fans.org>
> Tested-by: Sergey Lapin <slapin@...fans.org>

Is this still needed, or can I just use your:
	[PATCH v2 1/2] TTY: don't allow reopen when ldisc is changing
patch instead?

thanks,

greg k-h
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