From: Johan Hovold Date: Thu, 16 Jan 2020 16:07:05 +0000 (+0100) Subject: USB: serial: suppress driver bind attributes X-Git-Tag: v4.19.98~92 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=1b86caef6d48e16f25dea661bae41f199598f359;p=platform%2Fkernel%2Flinux-rpi.git 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 --- diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c index 4341537..b1f0aa1 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 */