55 lines
1.8 KiB
Diff
55 lines
1.8 KiB
Diff
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From linux-kernel-owner@vger.kernel.org Wed Nov 24 18:28:11 2010
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From: Jiri Slaby <jslaby@suse.cz>
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Subject: [PATCH 1/2] TTY: ldisc, fix open flag handling
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Date: Thu, 25 Nov 2010 00:27:54 +0100
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When a concrete ldisc open fails in tty_ldisc_open, we forget to clear
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TTY_LDISC_OPEN. This causes a false warning on the next ldisc open:
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WARNING: at drivers/char/tty_ldisc.c:445 tty_ldisc_open+0x26/0x38()
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Hardware name: System Product Name
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Modules linked in: ...
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Pid: 5251, comm: a.out Tainted: G W 2.6.32-5-686 #1
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Call Trace:
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[<c1030321>] ? warn_slowpath_common+0x5e/0x8a
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[<c1030357>] ? warn_slowpath_null+0xa/0xc
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[<c119311c>] ? tty_ldisc_open+0x26/0x38
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[<c11936c5>] ? tty_set_ldisc+0x218/0x304
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...
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So clear the bit when failing...
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Introduced in c65c9bc3efa (tty: rewrite the ldisc locking) back in
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2.6.31-rc1.
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Signed-off-by: Jiri Slaby <jslaby@suse.cz>
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Cc: Alan Cox <alan@linux.intel.com>
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Reported-by: Sergey Lapin <slapin@ossfans.org>
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Tested-by: Sergey Lapin <slapin@ossfans.org>
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---
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drivers/tty/tty_ldisc.c | 2 ++
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1 files changed, 2 insertions(+), 0 deletions(-)
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diff --git a/drivers/tty/tty_ldisc.c b/drivers/tty/tty_ldisc.c
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index d8e96b0..4214d58 100644
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--- a/drivers/char/tty_ldisc.c
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+++ b/drivers/char/tty_ldisc.c
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@@ -454,6 +454,8 @@ static int tty_ldisc_open(struct tty_struct *tty, struct tty_ldisc *ld)
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/* BTM here locks versus a hangup event */
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WARN_ON(!tty_locked());
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ret = ld->ops->open(tty);
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+ if (ret)
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+ clear_bit(TTY_LDISC_OPEN, &tty->flags);
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return ret;
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}
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return 0;
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--
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1.7.3.1
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--
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