Messages in this thread Patch in this message | | | Date | Sun, 29 Dec 2013 11:03:18 +0800 | From | Wang YanQing <> | Subject | [PATCH] vt: fix potential dual con_driver register for conswitchp |
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We should check whether conswitchp is registered before add it to registered_con_driver in con_init, or it will cause dual con_driver register for conswitchp.
Although I haven't met it in reality, but I think it could happen for Embeded devices, who register platform con_driver earlier than call con_init.
Signed-off-by: Wang YanQing <udknight@gmail.com> --- drivers/tty/vt/vt.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c index edcd6b8..3de4504 100644 --- a/drivers/tty/vt/vt.c +++ b/drivers/tty/vt/vt.c @@ -2876,6 +2876,8 @@ static int __init con_init(void) for (i = 0; i < MAX_NR_CON_DRIVER; i++) { struct con_driver *con_driver = ®istered_con_driver[i]; + if (con_driver->con == conswitchp) + break; if (con_driver->con == NULL) { con_driver->con = conswitchp; con_driver->desc = display_desc; -- 1.8.3.4.8.g69490f3.dirty
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