tune2fs -E hash_alg=half_md4: safe for existing filesystems?

[Reindl Harald]

i have some older filesystems with
Default directory hash: tea

is change them to "half_md4" safe?
tune2fs -E hash_alg=half_md4 /dev/sdc1

they are all created short before the following commit:
http://git.whamcloud.com/?p=tools/e2fsprogs.git;a=commitdiff_plain;h=d1070d91b4de8438dc78c034283baaa19b31d25e



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