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authorAlan Cox <alan@linux.intel.com>2009-06-29 15:21:47 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2009-06-29 09:33:26 -0700
commitaef29bc2603014cb28dfe39bab8d888546fe18e7 (patch)
tree2fd190b9fb78504adbb7e1fdf902ad9f682633bc /ipc/util.c
parent52989765629e7d182b4f146050ebba0abf2cb0b7 (diff)
tty: Fix the leak in tty_ldisc_release
Currently we reinit the ldisc on final tty close which is what the old code did to ensure that if the device retained its termios settings then it had the right ldisc. tty_ldisc_reinit does that but also leaves us with the reset ldisc reference which is then leaked. At this point we know the port will be recycled so we can kill the ldisc off completely rather than try and add another ldisc free up when the kref count hits zero. At this point it is safe to keep the ldisc closed as tty_ldisc waiting methods are only used from the user side, and as the final close we are the last such reference. Interrupt/driver side methods will always use the non wait version and get back a NULL. Found with kmemleak and investigated/identified by Catalin Marinas. Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'ipc/util.c')
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