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| author | Andy Grover <andy.grover@oracle.com> | 2010-05-24 20:28:49 -0700 |
|---|---|---|
| committer | Andy Grover <andy.grover@oracle.com> | 2010-09-08 18:15:21 -0700 |
| commit | 3427e854e1a0e76be8b3d75fc0fa878f59b43693 (patch) | |
| tree | cc0bb1c074612cfd6634ac6a4fa9c92709fa185a /net | |
| parent | 0b088e003ccf316a76c51be5dec2d70b93be3be8 (diff) | |
| download | linux-3427e854e1a0e76be8b3d75fc0fa878f59b43693.tar.bz2 | |
RDS: Assume recv->r_frag is always NULL in refill_one()
refill_one() should never be called on a recv struct that
doesn't need a new r_frag allocated. Add a WARN and remove
conditional around r_frag alloc code.
Also, add a comment to explain why r_ibinc may or may not
need refilling.
Signed-off-by: Andy Grover <andy.grover@oracle.com>
Diffstat (limited to 'net')
| -rw-r--r-- | net/rds/ib_recv.c | 29 |
1 files changed, 16 insertions, 13 deletions
diff --git a/net/rds/ib_recv.c b/net/rds/ib_recv.c index f6dbf16e0741..5c7e6acf7c60 100644 --- a/net/rds/ib_recv.c +++ b/net/rds/ib_recv.c @@ -126,6 +126,10 @@ static int rds_ib_recv_refill_one(struct rds_connection *conn, struct ib_sge *sge; int ret = -ENOMEM; + /* + * ibinc was taken from recv if recv contained the start of a message. + * recvs that were continuations will still have this allocated. + */ if (!recv->r_ibinc) { if (!atomic_add_unless(&rds_ib_allocation, 1, rds_ib_sysctl_max_recv_allocation)) { rds_ib_stats_inc(s_ib_rx_alloc_limit); @@ -140,19 +144,18 @@ static int rds_ib_recv_refill_one(struct rds_connection *conn, rds_inc_init(&recv->r_ibinc->ii_inc, conn, conn->c_faddr); } - if (!recv->r_frag) { - recv->r_frag = kmem_cache_alloc(rds_ib_frag_slab, GFP_NOWAIT); - if (!recv->r_frag) - goto out; - INIT_LIST_HEAD(&recv->r_frag->f_item); - sg_init_table(&recv->r_frag->f_sg, 1); - ret = rds_page_remainder_alloc(&recv->r_frag->f_sg, - RDS_FRAG_SIZE, GFP_NOWAIT); - if (ret) { - kmem_cache_free(rds_ib_frag_slab, recv->r_frag); - recv->r_frag = NULL; - goto out; - } + WARN_ON(recv->r_frag); /* leak! */ + recv->r_frag = kmem_cache_alloc(rds_ib_frag_slab, GFP_NOWAIT); + if (!recv->r_frag) + goto out; + INIT_LIST_HEAD(&recv->r_frag->f_item); + sg_init_table(&recv->r_frag->f_sg, 1); + ret = rds_page_remainder_alloc(&recv->r_frag->f_sg, + RDS_FRAG_SIZE, GFP_NOWAIT); + if (ret) { + kmem_cache_free(rds_ib_frag_slab, recv->r_frag); + recv->r_frag = NULL; + goto out; } ret = ib_dma_map_sg(ic->i_cm_id->device, &recv->r_frag->f_sg, |