diff options
| author | Alan Cox <alan@linux.intel.com> | 2012-03-02 14:59:37 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-03-08 11:10:27 -0800 |
| commit | 20f62579dccc84428554b914e24a312a6554f841 (patch) | |
| tree | bd6b0f2724d75ba7fd17bb6422bfa05505018474 | |
| parent | 4001d7b7fc271052ebff43f327c26dc64806bbdf (diff) | |
vt: push down tioclinux cases
Some of this ventures into selection which is still a complete lost cause. We
are not making it any worse. It's completely busted anyway.
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/tty/vt/selection.c | 12 | ||||
| -rw-r--r-- | drivers/tty/vt/vt.c | 12 | ||||
| -rw-r--r-- | drivers/tty/vt/vt_ioctl.c | 2 |
3 files changed, 18 insertions, 8 deletions
diff --git a/drivers/tty/vt/selection.c b/drivers/tty/vt/selection.c index 738e45a3513..2a509167092 100644 --- a/drivers/tty/vt/selection.c +++ b/drivers/tty/vt/selection.c @@ -75,7 +75,7 @@ clear_selection(void) { /* * User settable table: what characters are to be considered alphabetic? - * 256 bits + * 256 bits. FIXME: Needs a locking model. */ static u32 inwordLut[8]={ 0x00000000, /* control chars */ @@ -307,7 +307,8 @@ int set_selection(const struct tiocl_selection __user *sel, struct tty_struct *t * queue of the tty associated with the current console. * Invoked by ioctl(). * - * Locking: always called with BTM from vt_ioctl + * Locking: called without locks. Calls the ldisc wrongly with + * unsafe methods, */ int paste_selection(struct tty_struct *tty) { @@ -322,13 +323,12 @@ int paste_selection(struct tty_struct *tty) poke_blanked_console(); console_unlock(); + /* FIXME: wtf is this supposed to achieve ? */ ld = tty_ldisc_ref(tty); - if (!ld) { - tty_unlock(); + if (!ld) ld = tty_ldisc_ref_wait(tty); - tty_lock(); - } + /* FIXME: this is completely unsafe */ add_wait_queue(&vc->paste_wait, &wait); while (sel_buffer && sel_buffer_lth > pasted) { set_current_state(TASK_INTERRUPTIBLE); diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c index ce2b8234362..ab7385e526a 100644 --- a/drivers/tty/vt/vt.c +++ b/drivers/tty/vt/vt.c @@ -2637,11 +2637,15 @@ int tioclinux(struct tty_struct *tty, unsigned long arg) ret = __put_user(data, p); break; case TIOCL_GETMOUSEREPORTING: + console_lock(); /* May be overkill */ data = mouse_reporting(); + console_unlock(); ret = __put_user(data, p); break; case TIOCL_SETVESABLANK: + console_lock(); ret = set_vesa_blanking(p); + console_unlock(); break; case TIOCL_GETKMSGREDIRECT: data = vt_get_kmsg_redirect(); @@ -2658,13 +2662,21 @@ int tioclinux(struct tty_struct *tty, unsigned long arg) } break; case TIOCL_GETFGCONSOLE: + /* No locking needed as this is a transiently + correct return anyway if the caller hasn't + disabled switching */ ret = fg_console; break; case TIOCL_SCROLLCONSOLE: if (get_user(lines, (s32 __user *)(p+4))) { ret = -EFAULT; } else { + /* Need the console lock here. Note that lots + of other calls need fixing before the lock + is actually useful ! */ + console_lock(); scrollfront(vc_cons[fg_console].d, lines); + console_unlock(); ret = 0; } break; diff --git a/drivers/tty/vt/vt_ioctl.c b/drivers/tty/vt/vt_ioctl.c index e05094d7634..c6720be8d21 100644 --- a/drivers/tty/vt/vt_ioctl.c +++ b/drivers/tty/vt/vt_ioctl.c @@ -298,9 +298,7 @@ int vt_ioctl(struct tty_struct *tty, switch (cmd) { case TIOCLINUX: - tty_lock(); ret = tioclinux(tty, arg); - tty_unlock(); break; case KIOCSOUND: if (!perm) |