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staging: panel: register driver after checking device

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register the driver only if lcd or keypad has been enabled and if
both are disabled then just exit.

Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
Acked-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sudip Mukherjee 2015-02-10 17:26:02 +05:30 committed by Greg Kroah-Hartman
parent 9ab81fb7a9
commit f43de77c9d
1 changed files with 6 additions and 12 deletions
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18
drivers/staging/panel/panel.c
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@ -2377,23 +2377,17 @@ static int __init panel_init_module(void)
/* tells various subsystems about the fact that we are initializing */
init_in_progress = 1;
if (!lcd.enabled && !keypad.enabled) {
/* no device enabled, let's exit */
pr_err("driver version " PANEL_VERSION " disabled.\n");
return -ENODEV;
}
if (parport_register_driver(&panel_driver)) {
pr_err("could not register with parport. Aborting.\n");
return -EIO;
}
if (!lcd.enabled && !keypad.enabled) {
/* no device enabled, let's release the parport */
if (pprt) {
parport_release(pprt);
parport_unregister_device(pprt);
pprt = NULL;
}
parport_unregister_driver(&panel_driver);
pr_err("driver version " PANEL_VERSION " disabled.\n");
return -ENODEV;
}
register_reboot_notifier(&panel_notifier);
if (pprt)