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authorSeongJae Park <sj@kernel.org>2023-10-07 20:04:32 +0000
committerAndrew Morton <akpm@linux-foundation.org>2023-10-18 12:12:41 -0700
commit76b7069bcc89dec33f03eb08abee165d0306b754 (patch)
treefca97c9e9f9146fe994d2222c5a8710614956ef5 /.mailmap
parentc5155d4ef4b2ac03cb5838b4060ab2ceb7dbda09 (diff)
mm/damon/sysfs: check DAMOS regions update progress from before_terminate()
DAMON_SYSFS can receive DAMOS tried regions update request while kdamond is already out of the main loop and before_terminate callback (damon_sysfs_before_terminate() in this case) is not yet called. And damon_sysfs_handle_cmd() can further be finished before the callback is invoked. Then, damon_sysfs_before_terminate() unlocks damon_sysfs_lock, which is not locked by anyone. This happens because the callback function assumes damon_sysfs_cmd_request_callback() should be called before it. Check if the assumption was true before doing the unlock, to avoid this problem. Link: https://lkml.kernel.org/r/20231007200432.3110-1-sj@kernel.org Fixes: f1d13cacabe1 ("mm/damon/sysfs: implement DAMOS tried regions update command") Signed-off-by: SeongJae Park <sj@kernel.org> Cc: <stable@vger.kernel.org> [6.2.x] Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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