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 my tty git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git
in the tty-linus branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the
next -rc kernel release.
If you have any questions about this process, please let me know.
>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
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]>
Cc: stable <[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(-)
diff --git a/Documentation/ABI/testing/sysfs-tty
b/Documentation/ABI/testing/sysfs-tty
index ad22fb0ee765..a2ccec35ffce 100644
--- 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
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index c74a00ad7add..bd2715a9d8e5 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -1267,16 +1267,17 @@ static void pty_line_name(struct tty_driver *driver,
int index, char *p)
* @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 device *dev,
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;
--
1.8.5.1.163.gd7aced9
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