Messages in this thread Patch in this message | | | From | Jiri Slaby <> | Subject | [PATCH 06/21] TTY: vt, fix paste_selection ldisc handling | Date | Thu, 18 Oct 2012 22:26:32 +0200 |
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There used to be a single tty_ldisc_ref_wait. But then, when a big-tty-mutex (BTM) was introduced, it has to be tty_ldisc_ref + tty_unlock + tty_ldisc_ref_wait + tty_lock. Later, BTM was removed from that path and tty_ldisc_ref + tty_ldisc_ref_wait remained there. But it makes no sense now. So leave there only tty_ldisc_ref_wait.
And when we have a reference to an ldisc, actually use it in the loop. Otherwise it may be racy.
Signed-off-by: Jiri Slaby <jslaby@suse.cz> --- drivers/tty/vt/selection.c | 9 ++------- 1 file changed, 2 insertions(+), 7 deletions(-)
diff --git a/drivers/tty/vt/selection.c b/drivers/tty/vt/selection.c index 8e9b4be..60b7b69 100644 --- a/drivers/tty/vt/selection.c +++ b/drivers/tty/vt/selection.c @@ -341,15 +341,11 @@ int paste_selection(struct tty_struct *tty) struct tty_ldisc *ld; DECLARE_WAITQUEUE(wait, current); - console_lock(); poke_blanked_console(); console_unlock(); - /* FIXME: wtf is this supposed to achieve ? */ - ld = tty_ldisc_ref(tty); - if (!ld) - ld = tty_ldisc_ref_wait(tty); + ld = tty_ldisc_ref_wait(tty); /* FIXME: this is completely unsafe */ add_wait_queue(&vc->paste_wait, &wait); @@ -361,8 +357,7 @@ int paste_selection(struct tty_struct *tty) } count = sel_buffer_lth - pasted; count = min(count, tty->receive_room); - tty->ldisc->ops->receive_buf(tty, sel_buffer + pasted, - NULL, count); + ld->ops->receive_buf(tty, sel_buffer + pasted, NULL, count); pasted += count; } remove_wait_queue(&vc->paste_wait, &wait); -- 1.7.12.3
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