From a55539a02e8a5acf19126519de48c5fb9c981c6c Mon Sep 17 00:00:00 2001 From: Johan Hovold Date: Thu, 16 Apr 2020 12:09:22 +0800 Subject: [PATCH] USB: serial: suppress driver bind attributes 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 Reviewed-by: Greg Kroah-Hartman Signed-off-by: Johan Hovold Signed-off-by: Greg Kroah-Hartman Signed-off-by: Yang Yingliang --- drivers/usb/serial/usb-serial.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c index 434153790982..b1f0aa12ba39 100644 --- a/drivers/usb/serial/usb-serial.c +++ b/drivers/usb/serial/usb-serial.c @@ -1294,6 +1294,9 @@ static int usb_serial_register(struct usb_serial_driver *driver) 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 */ -- GitLab