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 3.12-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-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From d8a5dc3033af2fd6d16030d2ee4fbd073460fe54 Mon Sep 17 00:00:00 2001
From: Hannes Reinecke <[email protected]>
Date: Fri, 7 Feb 2014 11:38:30 +0100
Subject: tty: Set correct tty name in 'active' sysfs attribute
From: Hannes Reinecke <[email protected]>
commit d8a5dc3033af2fd6d16030d2ee4fbd073460fe54 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.
This resolves an issue on s390 platforms in determining the correct
console device to use.
Cc: Lennart Poettering <[email protected]>
Cc: Kay Sievers <[email protected]>
Cc: Jiri Slaby <[email protected]>
Cc: David Herrmann <[email protected]>
Signed-off-by: Werner Fink <[email protected]>
Signed-off-by: Hannes Reinecke <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
Documentation/ABI/testing/sysfs-tty | 3 ++-
drivers/tty/tty_io.c | 25 ++++++++++++++++++-------
2 files changed, 20 insertions(+), 8 deletions(-)
--- a/Documentation/ABI/testing/sysfs-tty
+++ b/Documentation/ABI/testing/sysfs-tty
@@ -3,7 +3,8 @@ Date: Nov 2010
Contact: Kay Sievers <[email protected]>
Description:
Shows the list of currently configured
- console devices, like 'tty1 ttyS0'.
+ tty devices used for the console,
+ like 'tty1 ttyS0'.
The last entry in the file is the active
device connected to /dev/console.
The file supports poll() to detect virtual
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -1267,16 +1267,17 @@ static void pty_line_name(struct tty_dri
* @p: output buffer of at least 7 bytes
*
* Generate a name from a driver reference and write it to the output
- * buffer.
+ * buffer. Return the number of bytes written.
*
* 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--) {
+ struct tty_driver *driver;
+ const char *name = cs[i]->name;
+ int index = cs[i]->index;
+
+ driver = cs[i]->device(cs[i], &index);
+ if (driver) {
+ count += tty_line_name(driver, index, buf + count);
+ count += sprintf(buf + count, "%c", i ? ' ':'\n');
+ } else
+ count += sprintf(buf + count, "%s%d%c",
+ name, index, i ? ' ':'\n');
+ }
console_unlock();
return count;
Patches currently in stable-queue which might be from [email protected] are
queue-3.12/tty-set-correct-tty-name-in-active-sysfs-attribute.patch
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