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samples/damon: fix damon sample mtier for start failure
The damon_sample_mtier_start() can fail so we must reset the "enable"
parameter to "false" again for proper rollback.
In such cases, setting Y to "enable" then N triggers the similar crash
with mtier because damon sample start failed but the "enable" stays as Y.
Link: https://lkml.kernel.org/r/20250702000205.1921-4-honggyu.kim@sk.com
Fixes: 82a08bde3c
("samples/damon: implement a DAMON module for memory tiering")
Signed-off-by: Honggyu Kim <honggyu.kim@sk.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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@ -164,8 +164,12 @@ static int damon_sample_mtier_enable_store(
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if (enable == enabled)
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return 0;
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if (enable)
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return damon_sample_mtier_start();
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if (enable) {
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err = damon_sample_mtier_start();
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if (err)
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enable = false;
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return err;
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}
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damon_sample_mtier_stop();
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return 0;
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}
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