This is a note to let you know that I've just added the patch titled
tty: Set correct tty name in 'active' sysfs attribute
to the 3.13-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
tty-set-correct-tty-name-in-active-sysfs-attribute.patch
and it can be found in the queue-3.13 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 723abd87f6e536f1353c8f64f621520bc29523a3 Mon Sep 17 00:00:00 2001
From: Hannes Reinecke <hare@xxxxxxx>
Date: Thu, 27 Feb 2014 12:30:51 +0100
Subject: tty: Set correct tty name in 'active' sysfs attribute
From: Hannes Reinecke <hare@xxxxxxx>
commit 723abd87f6e536f1353c8f64f621520bc29523a3 upstream.
The 'active' sysfs attribute should refer to the currently active tty
devices the console is running on, not the currently active console. The
console structure doesn't refer to any device in sysfs, only the tty the
console is running on has. So we need to print out the tty names in
'active', not the console names.
There is one special-case, which is tty0. If the console is directed to
it, we want 'tty0' to show up in the file, so user-space knows that the
messages get forwarded to the active VT. The ->device() callback would
resolve tty0, though. Hence, treat it special and don't call into the VT
layer to resolve it (plymouth is known to depend on it).
Cc: Lennart Poettering <lennart@xxxxxxxxxxxxxx>
Cc: Kay Sievers <kay@xxxxxxxx>
Cc: Jiri Slaby <jslaby@xxxxxxx>
Signed-off-by: Werner Fink <werner@xxxxxxx>
Signed-off-by: Hannes Reinecke <hare@xxxxxxx>
Signed-off-by: David Herrmann <dh.herrmann@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/tty/tty_io.c | 23 +++++++++++++++++------
1 file changed, 17 insertions(+), 6 deletions(-)
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -1271,12 +1271,13 @@ static void pty_line_name(struct tty_dri
*
* Locking: None
*/
-static void tty_line_name(struct tty_driver *driver, int index, char *p)
+static ssize_t tty_line_name(struct tty_driver *driver, int index, char *p)
{
if (driver->flags & TTY_DRIVER_UNNUMBERED_NODE)
- strcpy(p, driver->name);
+ return sprintf(p, "%s", driver->name);
else
- sprintf(p, "%s%d", driver->name, index + driver->name_base);
+ return sprintf(p, "%s%d", driver->name,
+ index + driver->name_base);
}
/**
@@ -3545,9 +3546,19 @@ static ssize_t show_cons_active(struct d
if (i >= ARRAY_SIZE(cs))
break;
}
- while (i--)
- count += sprintf(buf + count, "%s%d%c",
- cs[i]->name, cs[i]->index, i ? ' ':'\n');
+ while (i--) {
+ int index = cs[i]->index;
+ struct tty_driver *drv = cs[i]->device(cs[i], &index);
+
+ /* don't resolve tty0 as some programs depend on it */
+ if (drv && (cs[i]->index > 0 || drv->major != TTY_MAJOR))
+ count += tty_line_name(drv, index, buf + count);
+ else
+ count += sprintf(buf + count, "%s%d",
+ cs[i]->name, cs[i]->index);
+
+ count += sprintf(buf + count, "%c", i ? ' ':'\n');
+ }
console_unlock();
return count;
Patches currently in stable-queue which might be from hare@xxxxxxx are
queue-3.13/tty-set-correct-tty-name-in-active-sysfs-attribute.patch
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