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BACKPORT: mm/damon/dbgfs: fix missed use of damon_dbgfs_lock 

DAMON debugfs is supposed to protect dbgfs_ctxs, dbgfs_nr_ctxs, and
dbgfs_dirs using damon_dbgfs_lock.  However, some of the code is
accessing the variables without the protection.  This fixes it by
protecting all such accesses.

Link: https://lkml.kernel.org/r/20211110145758.16558-3-sj@kernel.org
Fixes: 75c1c2b53c ("mm/damon/dbgfs: support multiple contexts")
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

(cherry picked from commit d78f3853f831eee46c6dbe726debf3be9e9c0d05)

Bug: 228223814
Signed-off-by: zhijun wan <wanzhijun@oppo.com>
Change-Id: Ibdfcc75f9f219b69a4b4e6161af257c1d0eba891
This commit is contained in:
SeongJae Park 2021-11-19 16:43:52 -08:00 committed by Suren Baghdasaryan
parent 4c2134830a
commit d49b62ccfd
1 changed files with 1 additions and 0 deletions
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mm/damon/dbgfs.c
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@ -894,6 +894,7 @@ static ssize_t dbgfs_monitor_on_write(struct file *file,
for (i = 0; i < dbgfs_nr_ctxs; i++) {
if (damon_targets_empty(dbgfs_ctxs[i])) {
kfree(kbuf);
mutex_unlock(&damon_dbgfs_lock);
return -EINVAL;
}
}