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tty: vt, finish looping on duplicate 

When the console is already registered, stop crawling the
registered_con_driver array and return an error immediatelly.

This makes the code more obvious. And we do not need to initialize
retval anymore.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby 2016-05-03 17:05:55 +02:00 committed by Greg Kroah-Hartman
parent 6798df4c5f
commit 96317e9e2a
1 changed files with 4 additions and 5 deletions
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9
drivers/tty/vt/vt.c
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@ -3575,7 +3575,7 @@ static int do_register_con_driver(const struct consw *csw, int first, int last)
struct module *owner = csw->owner;
struct con_driver *con_driver;
const char *desc;
int i, retval = 0;
int i, retval;
WARN_CONSOLE_UNLOCKED();
@ -3586,13 +3586,12 @@ static int do_register_con_driver(const struct consw *csw, int first, int last)
con_driver = &registered_con_driver[i];
/* already registered */
if (con_driver->con == csw)
if (con_driver->con == csw) {
retval = -EBUSY;
goto err;
}
}
if (retval)
goto err;
desc = csw->con_startup();
if (!desc) {
retval = -ENODEV;