Patch "IB/mlx5: Wait for all async command completions to complete" has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

IB/mlx5: Wait for all async command completions to complete

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
ib-mlx5-wait-for-all-async-command-completions-to-complete.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Eli Cohen <[email protected]>
Date: Thu, 27 Oct 2016 16:36:43 +0300
Subject: IB/mlx5: Wait for all async command completions to complete

From: Eli Cohen <[email protected]>

commit acbda523884dcf45613bf6818d8ead5180df35c2 upstream.

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

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

@@ -647,6 +647,33 @@ 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;

@@ -660,6 +687,7 @@ 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;

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/ib-mlx5-avoid-system-crash-when-enabling-many-vfs.patch queue-4.9/ib-mlx5-wait-for-all-async-command-completions-to-complete.patch queue-4.9/ib-mlx5-fix-reported-max-sge-calculation.patch