From c86d1b8ae622e1ea5d20e98bd72fbd7d9dd69016 Mon Sep 17 00:00:00 2001 From: Mike Snitzer Date: Thu, 3 Jun 2010 11:34:52 -0600 Subject: block: avoid unconditionally freeing previously allocated request_queue On blk_init_allocated_queue_node failure, only free the request_queue if it is wasn't previously allocated outside the block layer (e.g. blk_init_queue_node was blk_init_allocated_queue_node caller). This addresses an interface bug introduced by the following commit: 01effb0 block: allow initialization of previously allocated request_queue Otherwise the request_queue may be free'd out from underneath a caller that is managing the request_queue directly (e.g. caller uses blk_alloc_queue + blk_init_allocated_queue_node). Signed-off-by: Mike Snitzer Signed-off-by: Jens Axboe --- block/blk-core.c | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-) diff --git a/block/blk-core.c b/block/blk-core.c index 3bc5579d6f5..826d0707890 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -570,9 +570,17 @@ EXPORT_SYMBOL(blk_init_queue); struct request_queue * blk_init_queue_node(request_fn_proc *rfn, spinlock_t *lock, int node_id) { - struct request_queue *q = blk_alloc_queue_node(GFP_KERNEL, node_id); + struct request_queue *uninit_q, *q; - return blk_init_allocated_queue_node(q, rfn, lock, node_id); + uninit_q = blk_alloc_queue_node(GFP_KERNEL, node_id); + if (!uninit_q) + return NULL; + + q = blk_init_allocated_queue_node(uninit_q, rfn, lock, node_id); + if (!q) + blk_cleanup_queue(uninit_q); + + return q; } EXPORT_SYMBOL(blk_init_queue_node); @@ -592,10 +600,8 @@ blk_init_allocated_queue_node(struct request_queue *q, request_fn_proc *rfn, return NULL; q->node = node_id; - if (blk_init_free_list(q)) { - kmem_cache_free(blk_requestq_cachep, q); + if (blk_init_free_list(q)) return NULL; - } q->request_fn = rfn; q->prep_rq_fn = NULL; @@ -618,7 +624,6 @@ blk_init_allocated_queue_node(struct request_queue *q, request_fn_proc *rfn, return q; } - blk_put_queue(q); return NULL; } EXPORT_SYMBOL(blk_init_allocated_queue_node); -- cgit v1.2.3