dm snapshot: fix lockup in dm_exception_table_exit
[ Upstream commit 6e7132ed3c
]
There was reported lockup when we exit a snapshot with many exceptions.
Fix this by adding "cond_resched" to the loop that frees the exceptions.
Reported-by: John Pittman <jpittman@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -679,8 +679,10 @@ static void dm_exception_table_exit(struct dm_exception_table *et,
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for (i = 0; i < size; i++) {
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slot = et->table + i;
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hlist_bl_for_each_entry_safe(ex, pos, n, slot, hash_list)
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hlist_bl_for_each_entry_safe(ex, pos, n, slot, hash_list) {
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kmem_cache_free(mem, ex);
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cond_resched();
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}
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}
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kvfree(et->table);
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