Public bug reported:
The Ubuntu kernel has carried an out-of-tree driver "ubuntu/xr-usb-
serial/" since forever. That driver uses the #define'd constant
ASYNCB_INITIALIZED in multiple places, e.g.:
if (test_bit(ASYNCB_INITIALIZED, &xr_usb_serial->port.flags))
But this recent mainline commit (and all linux-stable's >= 4.14) removes
the definition of ASYNCB_INITIALIZED ...
[mainline] d09845e98a05 tty: actually undefine superseded ASYNC
flags
Some kernel-internal ASYNC flags have been superseded by tty-port flags
and should no longer be used by kernel drivers.
Fix the misspelled "__KERNEL__" compile guards which failed their sole
purpose to break out-of-tree drivers that have not yet been updated.
... Which would make ubuntu/xr-usb-serial/ fail to build (as the
upstream commit intends).
To avoid that breakage, the stable backports of [mainline] d09845e98a05
will be omitted from all Ubuntu kernels, pending some other resolution
of the problem with ubuntu/xr-usb-serial.
** Affects: linux (Ubuntu)
Importance: Medium
Status: New
** Affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
** Affects: linux (Ubuntu Focal)
Importance: Undecided
Status: New
** Affects: linux (Ubuntu Groovy)
Importance: Undecided
Status: New
** Affects: linux (Ubuntu Hirsute)
Importance: Undecided
Status: New
** Affects: linux (Ubuntu Impish)
Importance: Medium
Status: New
** Also affects: linux (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Hirsute)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Groovy)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Impish)
Importance: Medium
Status: New
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https://bugs.launchpad.net/bugs/1929452
Title:
upstream stable would break ubuntu/xr-usb-serial (deprecated ASYNC
flags)
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