From a3cd7d9070be417a21905c997ee32d756d999b38 Mon Sep 17 00:00:00 2001 From: Olaf Kirch Date: Wed, 16 Jan 2008 18:37:16 +0100 Subject: [PATCH] IB/fmr_pool: ib_fmr_pool_flush() should flush all dirty FMRs When a FMR is released via ib_fmr_pool_unmap(), the FMR usually ends up on the free_list rather than the dirty_list (because we allow a certain number of remappings before actually requiring a flush). However, ib_fmr_batch_release() only looks at dirty_list when flushing out old mappings. This means that when ib_fmr_pool_flush() is used to force a flush of the FMR pool, some dirty FMRs that have not reached their maximum remap count will not actually be flushed. Fix this by flushing all FMRs that have been used at least once in ib_fmr_batch_release(). Signed-off-by: Olaf Kirch Signed-off-by: Roland Dreier --- drivers/infiniband/core/fmr_pool.c | 21 +++++++++++++++------ 1 file changed, 15 insertions(+), 6 deletions(-) diff --git a/drivers/infiniband/core/fmr_pool.c b/drivers/infiniband/core/fmr_pool.c index 4a476a87021..6c7aa59794d 100644 --- a/drivers/infiniband/core/fmr_pool.c +++ b/drivers/infiniband/core/fmr_pool.c @@ -139,7 +139,7 @@ static inline struct ib_pool_fmr *ib_fmr_cache_lookup(struct ib_fmr_pool *pool, static void ib_fmr_batch_release(struct ib_fmr_pool *pool) { int ret; - struct ib_pool_fmr *fmr; + struct ib_pool_fmr *fmr, *next; LIST_HEAD(unmap_list); LIST_HEAD(fmr_list); @@ -158,6 +158,20 @@ static void ib_fmr_batch_release(struct ib_fmr_pool *pool) #endif } + /* + * The free_list may hold FMRs that have been put there + * because they haven't reached the max_remap count. + * Invalidate their mapping as well. + */ + list_for_each_entry_safe(fmr, next, &pool->free_list, list) { + if (fmr->remap_count == 0) + continue; + hlist_del_init(&fmr->cache_node); + fmr->remap_count = 0; + list_add_tail(&fmr->fmr->list, &fmr_list); + list_move(&fmr->list, &unmap_list); + } + list_splice(&pool->dirty_list, &unmap_list); INIT_LIST_HEAD(&pool->dirty_list); pool->dirty_len = 0; @@ -367,11 +381,6 @@ void ib_destroy_fmr_pool(struct ib_fmr_pool *pool) i = 0; list_for_each_entry_safe(fmr, tmp, &pool->free_list, list) { - if (fmr->remap_count) { - INIT_LIST_HEAD(&fmr_list); - list_add_tail(&fmr->fmr->list, &fmr_list); - ib_unmap_fmr(&fmr_list); - } ib_dealloc_fmr(fmr->fmr); list_del(&fmr->list); kfree(fmr); -- 2.20.1