[PATCH 4.4 02/42] IB/mlx5: Wait for all async command completions to complete

[Greg Kroah-Hartman]

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Eli Cohen <e...@mellanox.com>

commit acbda523884dcf45613bf6818d8ead5180df35c2 upstream.

Wait before continuing unload till all pending mkey async creation requests
are done.

Fixes: e126ba97dba9 ('mlx5: Add driver for Mellanox Connect-IB adapters')
Signed-off-by: Eli Cohen <e...@mellanox.com>
Signed-off-by: Maor Gottlieb <ma...@mellanox.com>
Signed-off-by: Leon Romanovsky <l...@kernel.org>
Signed-off-by: Doug Ledford <dledf...@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/infiniband/hw/mlx5/mr.c |   28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

--- a/drivers/infiniband/hw/mlx5/mr.c
+++ b/drivers/infiniband/hw/mlx5/mr.c
@@ -614,6 +614,33 @@ int mlx5_mr_cache_init(struct mlx5_ib_de
        return 0;
 }
 
+static void wait_for_async_commands(struct mlx5_ib_dev *dev)
+{
+       struct mlx5_mr_cache *cache = &dev->cache;
+       struct mlx5_cache_ent *ent;
+       int total = 0;
+       int i;
+       int j;
+
+       for (i = 0; i < MAX_MR_CACHE_ENTRIES; i++) {
+               ent = &cache->ent[i];
+               for (j = 0 ; j < 1000; j++) {
+                       if (!ent->pending)
+                               break;
+                       msleep(50);
+               }
+       }
+       for (i = 0; i < MAX_MR_CACHE_ENTRIES; i++) {
+               ent = &cache->ent[i];
+               total += ent->pending;
+       }
+
+       if (total)
+               mlx5_ib_warn(dev, "aborted while there are %d pending mr 
requests\n", total);
+       else
+               mlx5_ib_warn(dev, "done with all pending requests\n");
+}
+
 int mlx5_mr_cache_cleanup(struct mlx5_ib_dev *dev)
 {
        int i;
@@ -627,6 +654,7 @@ int mlx5_mr_cache_cleanup(struct mlx5_ib
                clean_keys(dev, i);
 
        destroy_workqueue(dev->cache.wq);
+       wait_for_async_commands(dev);
        del_timer_sync(&dev->delay_timer);
 
        return 0;