On Thu, Feb 20, 2014 at 6:52 PM, Greg Kroah-Hartman
<gregkh@xxxxxxxxxxxxxxxxxxx> wrote:
> 3.13-stable review patch. If anyone has any objections, please let me know.
>
> ------------------
>
> From: Hannes Reinecke <hare@xxxxxxx>
>
> 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.
Just to be double sure this is seen, Ray points out that it breaks
current plymouth because the heuristic changed. Hold off on this one?
josh
>
> Cc: Lennart Poettering <lennart@xxxxxxxxxxxxxx>
> Cc: Kay Sievers <kay@xxxxxxxx>
> Cc: Jiri Slaby <jslaby@xxxxxxx>
> Cc: David Herrmann <dh.herrmann@xxxxxxxxx>
> Signed-off-by: Werner Fink <werner@xxxxxxx>
> Signed-off-by: Hannes Reinecke <hare@xxxxxxx>
> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
>
> ---
> 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 <kay.sievers@xxxxxxxx>
> 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;
>
>
> --
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