On 2012.10.05 at 07:26 -0700, Greg Kroah-Hartman wrote:
> On Fri, Oct 05, 2012 at 02:57:17PM +0200, Markus Trippelsdorf wrote:
> > On the current git tree one sees messages such as:
> > tty_init_dev: 24 callbacks suppressed
> > tty_init_dev: 3 callbacks suppressed
> >
> > To fix this we need to look at condition before calling __ratelimit in
> > the WARN_RATELIMIT macro. While at it remove the superfluous
> > __WARN_RATELIMIT macros.
> >
> > Original patch is from Joe Perches and Jiri Slaby.
> >
> > Signed-off-by: Markus Trippelsdorf <mar...@trippelsdorf.de>
> > Acked-and-tested-by: Borislav Petkov <borislav.pet...@amd.com>
> > ---
> > include/linux/ratelimit.h | 27 +++++++++------------------
> > 1 file changed, 9 insertions(+), 18 deletions(-)
>
> I don't have a problem with this patch, but I don't understand why it's
> now showing up. There haven't been any changes in the ratelimit.h area
> recently that I can see, so why is this change needed now? What is in
> the tty layer that is causing this, just the fact that it's actually
> being used now?
See Jiri's recent commit:
commit 5d4121c04b3577e37e389b3553d442f44bb346d7
Author: Jiri Slaby <jsl...@suse.cz>
Date: Fri Aug 17 14:27:52 2012 +0200
TTY: check if tty->port is assigned
And if not, complain loudly. None in-kernel module should trigger
that, but let us find out for sure. On the other hand, all the
out-of-tree modules will hit that. Give them some time (maybe one
release) to catch up.
Signed-off-by: Jiri Slaby <jsl...@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 28c3e86..41e42f1 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -1415,6 +1415,10 @@ struct tty_struct *tty_init_dev(struct tty_driver
*driver, int idx)
if (!tty->port)
tty->port = driver->ports[idx];
+ WARN_RATELIMIT(!tty->port,
+ "%s: %s driver does not set tty->port. This will crash
the kernel later. Fix the driver!\n",
+ __func__, tty->driver->name);
+
/*
* Structures all installed ... call the ldisc open routines.
* If we fail here just call release_tty to clean up. No need
--
Markus
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
