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| author | Peter Hurley <peter@hurleysoftware.com> | 2014-10-16 13:51:30 -0400 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2014-11-13 19:03:00 +0100 |
| commit | 866f9fec24ee1dfa4a40e1d166b6ce3f4c3736de (patch) | |
| tree | ba9b4f966ebb6d530039ad342bf6dd341d4d4b3b /kernel | |
| parent | 0277558a6cc692295cb568b22970c12db2587f9a (diff) | |
| download | lwn-866f9fec24ee1dfa4a40e1d166b6ce3f4c3736de.tar.gz lwn-866f9fec24ee1dfa4a40e1d166b6ce3f4c3736de.zip | |
tty: Fix high cpu load if tty is unreleaseable
commit 37b164578826406a173ca7c20d9ba7430134d23e upstream.
Kernel oops can cause the tty to be unreleaseable (for example, if
n_tty_read() crashes while on the read_wait queue). This will cause
tty_release() to endlessly loop without sleeping.
Use a killable sleep timeout which grows by 2n+1 jiffies over the interval
[0, 120 secs.) and then jumps to forever (but still killable).
NB: killable just allows for the task to be rewoken manually, not
to be terminated.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Diffstat (limited to 'kernel')
0 files changed, 0 insertions, 0 deletions