bcache: fix for gc crashing when no sectors are used
Signed-off-by: Nicholas Swenson <nks@daterainc.com>
Signed-off-by: Kent Overstreet <kmo@daterainc.com>
diff --git a/drivers/md/bcache/movinggc.c b/drivers/md/bcache/movinggc.c
index 7c1275e..46c9523 100644
--- a/drivers/md/bcache/movinggc.c
+++ b/drivers/md/bcache/movinggc.c
@@ -184,7 +184,8 @@
static unsigned bucket_heap_top(struct cache *ca)
{
- return GC_SECTORS_USED(heap_peek(&ca->heap));
+ struct bucket *b;
+ return (b = heap_peek(&ca->heap)) ? GC_SECTORS_USED(b) : 0;
}
void bch_moving_gc(struct cache_set *c)