[SRU] [B/C] [PATCH 0/1] Fix null pointer dereference when xHCI gets unplugged

[Kai-Heng Feng]

BugLink: https://bugs.launchpad.net/bugs/1768852

[Impact]
When unplugging the Thunderbolt 3 cable from the TBT controller, kernel
oops.

[Test]
The user confirms this patch works.

[Fix]
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
behavior.

Zhengjun Xing (1):
  xhci: Fix Kernel oops in xhci dbgtty

 drivers/usb/host/xhci-dbgtty.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

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2.17.0