On a multiprocessor machine the VT_WAITACTIVE ioctl call may return 0
if fg_console has already been updated in redraw_screen(), but the
console switch itself hasn't been completed. Fix this by checking
fg_console in vt_waitactive() with the console sem held.
Signed-off-by: Michal Januszewski <[EMAIL PROTECTED]>
---
diff --git a/drivers/char/vt_ioctl.c b/drivers/char/vt_ioctl.c
index 3a5d301..00b5b34 100644
--- a/drivers/char/vt_ioctl.c
+++ b/drivers/char/vt_ioctl.c
@@ -1041,8 +1041,12 @@ int vt_waitactive(int vt)
for (;;) {
set_current_state(TASK_INTERRUPTIBLE);
retval = 0;
- if (vt == fg_console)
+ acquire_console_sem();
+ if (vt == fg_console) {
+ release_console_sem();
break;
+ }
+ release_console_sem();
retval = -EINTR;
if (signal_pending(current))
break;
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
