From: Yishai Hadas yishaih@mellanox.com
commit afd1417404fba6dbfa6c0a8e5763bd348da682e4 upstream.
Use a direct firmware command to destroy the mkey in case the unreg UMR operation has failed.
This prevents a case that a mkey will leak out from the cache post a failure to be destroyed by a UMR WR.
In case the MR cache limit didn't reach a call to add another entry to the cache instead of the destroyed one is issued.
In addition, replaced a warn message to WARN_ON() as this flow is fatal and can't happen unless some bug around.
Link: https://lore.kernel.org/r/20190723065733.4899-4-leon@kernel.org Cc: stable@vger.kernel.org # 4.10 Fixes: 49780d42dfc9 ("IB/mlx5: Expose MR cache for mlx5_ib") Signed-off-by: Yishai Hadas yishaih@mellanox.com Reviewed-by: Artemy Kovalyov artemyko@mellanox.com Signed-off-by: Leon Romanovsky leonro@mellanox.com Reviewed-by: Jason Gunthorpe jgg@mellanox.com Signed-off-by: Jason Gunthorpe jgg@mellanox.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/infiniband/hw/mlx5/mr.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-)
--- a/drivers/infiniband/hw/mlx5/mr.c +++ b/drivers/infiniband/hw/mlx5/mr.c @@ -545,13 +545,16 @@ void mlx5_mr_cache_free(struct mlx5_ib_d return;
c = order2idx(dev, mr->order); - if (c < 0 || c >= MAX_MR_CACHE_ENTRIES) { - mlx5_ib_warn(dev, "order %d, cache index %d\n", mr->order, c); - return; - } + WARN_ON(c < 0 || c >= MAX_MR_CACHE_ENTRIES);
- if (unreg_umr(dev, mr)) + if (unreg_umr(dev, mr)) { + mr->allocated_from_cache = false; + destroy_mkey(dev, mr); + ent = &cache->ent[c]; + if (ent->cur < ent->limit) + queue_work(cache->wq, &ent->work); return; + }
ent = &cache->ent[c]; spin_lock_irq(&ent->lock);