Patch "IB/mlx5: Verify that Q counters are supported" 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: Verify that Q counters are supported

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-verify-that-q-counters-are-supported.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: Kamal Heib <[email protected]>
Date: Wed, 18 Jan 2017 14:10:32 +0200
Subject: IB/mlx5: Verify that Q counters are supported

From: Kamal Heib <[email protected]>

commit 45bded2c216da6010184ac5ebe88c27f73439009 upstream.

Make sure that the Q counters are supported by the FW before trying to allocate/deallocte them, this will avoid driver load failure when they aren't supported by the FW.

---
 drivers/infiniband/hw/mlx5/main.c |   14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

@@ -3141,9 +3141,11 @@ static void *mlx5_ib_add(struct mlx5_cor
 	if (err)
 		goto err_rsrc;
 
-	err = mlx5_ib_alloc_q_counters(dev);
-	if (err)
-		goto err_odp;
+	if (MLX5_CAP_GEN(dev->mdev, max_qp_cnt)) {
+		err = mlx5_ib_alloc_q_counters(dev);
+		if (err)
+			goto err_odp;
+	}
 
 	err = ib_register_device(&dev->ib_dev, NULL);
 	if (err)

@@ -3171,7 +3173,8 @@ err_dev:
 	ib_unregister_device(&dev->ib_dev);
 
 err_q_cnt:
-	mlx5_ib_dealloc_q_counters(dev);
+	if (MLX5_CAP_GEN(dev->mdev, max_qp_cnt))
+		mlx5_ib_dealloc_q_counters(dev);
 
 err_odp:
 	mlx5_ib_odp_remove_one(dev);

@@ -3201,7 +3204,8 @@ static void mlx5_ib_remove(struct mlx5_c
 
 	mlx5_remove_roce_notifier(dev);
 	ib_unregister_device(&dev->ib_dev);
-	mlx5_ib_dealloc_q_counters(dev);
+	if (MLX5_CAP_GEN(dev->mdev, max_qp_cnt))
+		mlx5_ib_dealloc_q_counters(dev);
 	destroy_umrc_res(dev);
 	mlx5_ib_odp_remove_one(dev);
 	destroy_dev_resources(&dev->devr);

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

queue-4.9/ib-mlx5-verify-that-q-counters-are-supported.patch