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Commit e7d4cff5 authored by Mikulas Patocka's avatar Mikulas Patocka Committed by Greg Kroah-Hartman
Browse files

dm snapshot: fix lockup in dm_exception_table_exit 



[ Upstream commit 6e7132ed3c07bd8a6ce3db4bb307ef2852b322dc ]

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: default avatarJohn Pittman <jpittman@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: default avatarMikulas Patocka <mpatocka@redhat.com>
Signed-off-by: default avatarMike Snitzer <snitzer@kernel.org>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent 35ff8175

drivers/md/dm-snap.c

+3 −1
Original line number Diff line number Diff line
@@ -685,8 +685,10 @@ static void dm_exception_table_exit(struct dm_exception_table *et, 
	for (i = 0; i < size; i++) {

		slot = et->table + i;



		hlist_bl_for_each_entry_safe(ex, pos, n, slot, hash_list)

		hlist_bl_for_each_entry_safe(ex, pos, n, slot, hash_list) {

			kmem_cache_free(mem, ex);

			cond_resched();

		}

	}



	vfree(et->table);