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usb-serial: fix usb_serial_register bug when boot with nousb param 

With "nousb" cmdline booting, built-in serial drivers (ie. airecable)
will trigger kernel oops.

Indeed, if nousb, usb_serial_init will failed, and the usb serial bus type
will not be registerd, then usb_serial_register call driver_register
which try to register the driver to a not registered bus.

Here add usb_disabled() check in usb_serial_register to fix it.

Signed-off-by: Dave Young <hidave.darkstar@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Dave Young 2009-02-14 21:21:13 +08:00 committed by Greg Kroah-Hartman
parent d0626808f7
commit e4abe6658a
1 changed files with 3 additions and 0 deletions
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3
drivers/usb/serial/usb-serial.c
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@ -1241,6 +1241,9 @@ int usb_serial_register(struct usb_serial_driver *driver)
/* must be called with BKL held */
int retval;
if (usb_disabled())
return -ENODEV;
fixup_generic(driver);
if (!driver->description)