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| author | Gaurav Kohli <gkohli@codeaurora.org> | 2018-01-23 10:46:34 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-01-23 10:57:37 +0300 |
| commit | b027e2298bd588d6fa36ed2eda97447fb3eac078 (patch) | |
| tree | 3b90cee88ac74c2828b90b67d67cf7adf6e9e310 /tools/perf/pmu-events/arch/x86/broadwell/cache.json | |
| parent | 09df0b3464e528c6a4ca2c48d9ff6d2fd7cbd775 (diff) | |
| download | linux-b027e2298bd588d6fa36ed2eda97447fb3eac078.tar.xz | |
tty: fix data race between tty_init_dev and flush of buf
There can be a race, if receive_buf call comes before
tty initialization completes in n_tty_open and tty->disc_data
may be NULL.
CPU0 CPU1
---- ----
000|n_tty_receive_buf_common() n_tty_open()
-001|n_tty_receive_buf2() tty_ldisc_open.isra.3()
-002|tty_ldisc_receive_buf(inline) tty_ldisc_setup()
Using ldisc semaphore lock in tty_init_dev till disc_data
initializes completely.
Signed-off-by: Gaurav Kohli <gkohli@codeaurora.org>
Reviewed-by: Alan Cox <alan@linux.intel.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'tools/perf/pmu-events/arch/x86/broadwell/cache.json')
0 files changed, 0 insertions, 0 deletions