tty: mark Siemens R3964 line discipline as BROKEN

commit c7084edc3f6d67750f50d4183134c4fb5712a5c8 upstream.

The n_r3964 line discipline driver was written in a different time, when
SMP machines were rare, and users were trusted to do the right thing.
Since then, the world has moved on but not this code, it has stayed
rooted in the past with its lovely hand-crafted list structures and
loads of "interesting" race conditions all over the place.

After attempting to clean up most of the issues, I just gave up and am
now marking the driver as BROKEN so that hopefully someone who has this
hardware will show up out of the woodwork (I know you are out there!)
and will help with debugging a raft of changes that I had laying around
for the code, but was too afraid to commit as odds are they would break
things.

Many thanks to Jann and Linus for pointing out the initial problems in
this codebase, as well as many reviews of my attempts to fix the issues.
It was a case of whack-a-mole, and as you can see, the mole won.

Reported-by: Jann Horn <jannh@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index c28dca0c613d1be5d99c924fe68da994c32b7847..88316f86cc952d7792f7b99f06d43b2168194909 100644 (file)
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -380,7 +380,7 @@ config XILINX_HWICAP
 
 config R3964
        tristate "Siemens R3964 line discipline"
-       depends on TTY
+       depends on TTY && BROKEN
        ---help---
          This driver allows synchronous communication with devices using the
          Siemens R3964 packet protocol. Unless you are dealing with special