From: Johan Hovold johan@kernel.org
commit fdb838efa31e1ed9a13ae6ad0b64e30fdbd00570 upstream.
USB-serial drivers must not be unbound from their ports before the corresponding USB driver is unbound from the parent interface so suppress the bind and unbind attributes.
Unbinding a serial driver while it's port is open is a sure way to trigger a crash as any driver state is released on unbind while port hangup is handled on the parent USB interface level. Drivers for multiport devices where ports share a resource such as an interrupt endpoint also generally cannot handle individual ports going away.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Cc: stable stable@vger.kernel.org Reviewed-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Johan Hovold johan@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/usb/serial/usb-serial.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/drivers/usb/serial/usb-serial.c +++ b/drivers/usb/serial/usb-serial.c @@ -1332,6 +1332,9 @@ static int usb_serial_register(struct us return -EINVAL; }
+ /* Prevent individual ports from being unbound. */ + driver->driver.suppress_bind_attrs = true; + usb_serial_operations_init(driver);
/* Add this device to our list of devices */