got it, thanks.
Serge E. Hallyn wrote:
> we always return tty expecting it to hold the error code.
>
> Signed-off-by: Serge E. Hallyn <serue@xxxxxxxxxx>
> ---
> drivers/char/tty_io.c | 6 +++++-
> 1 files changed, 5 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
> index 1729b2f..ee95938 100644
> --- a/drivers/char/tty_io.c
> +++ b/drivers/char/tty_io.c
> @@ -3033,8 +3033,12 @@ static struct tty_struct *do_restore_tty(struct ckpt_ctx *ctx)
> */
> if (master) {
> file = pty_open_by_index("/dev/ptmx", h->index);
> - if (IS_ERR(file))
> + if (IS_ERR(file)) {
> + ckpt_write_err(ctx, "TE", "Error %d opening /dev/ptmx",
> + PTR_ERR(file));
> + tty = ERR_PTR(PTR_ERR(file));
> goto out;
> + }
>
> /*
> * Add file to objhash to ensure proper cleanup later
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