> BugLink: https://bugs.launchpad.net/bugs/1768852 >
> When unplugging the Thunderbolt 3 cable from the TBT controller, kernel
> The user confirms this patch works.
> tty_unregister_driver may be called more than 1 time in some
> hotplug cases,it will cause the kernel oops. This patch checked
> dbc_tty_driver to make sure it is unregistered only 1 time.
> [Regression Potential]
> Low. The change is to guard against null pointer, so it's the correct
> Zhengjun Xing (1):
> xhci: Fix Kernel oops in xhci dbgtty
> drivers/usb/host/xhci-dbgtty.c | 8 +++++---
> 1 file changed, 5 insertions(+), 3 deletions(-)