From 53cc7721fdf12e649994cfb7d8f562acb0e4510b Mon Sep 17 00:00:00 2001
From: Thomas Falcon <tlfalcon@linux.vnet.ibm.com>
Date: Mon, 26 Feb 2018 18:10:56 -0600
Subject: [PATCH] ibmvnic: Allocate statistics buffers during probe

References: bsc#1082993
Patch-mainline: v4.17-rc1
Git-commit: 53cc7721fdf12e649994cfb7d8f562acb0e4510b

Currently, buffers holding individual queue statistics are allocated
when the device is opened. If an ibmvnic interface is hotplugged or
initialized but never opened, an attempt to get statistics with
ethtool will result in a kernel panic.

Since the driver allocates a constant number, the maximum supported
queues, of buffers, these can be allocated during device probe and
freed when the device is hot-unplugged or the module is removed.

Signed-off-by: Thomas Falcon <tlfalcon@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Michal Suchanek <msuchanek@suse.de>
---
 drivers/net/ethernet/ibm/ibmvnic.c | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index 32ee202de13a..1a0f67b60003 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -845,8 +845,6 @@ static void release_resources(struct ibmvnic_adapter *adapter)
 	release_tx_pools(adapter);
 	release_rx_pools(adapter);
 
-	release_stats_token(adapter);
-	release_stats_buffers(adapter);
 	release_error_buffers(adapter);
 	release_napi(adapter);
 	release_login_rsp_buffer(adapter);
@@ -974,14 +972,6 @@ static int init_resources(struct ibmvnic_adapter *adapter)
 	if (rc)
 		return rc;
 
-	rc = init_stats_buffers(adapter);
-	if (rc)
-		return rc;
-
-	rc = init_stats_token(adapter);
-	if (rc)
-		return rc;
-
 	adapter->vpd = kzalloc(sizeof(*adapter->vpd), GFP_KERNEL);
 	if (!adapter->vpd)
 		return -ENOMEM;
@@ -4431,6 +4421,14 @@ static int ibmvnic_init(struct ibmvnic_adapter *adapter)
 		release_crq_queue(adapter);
 	}
 
+	rc = init_stats_buffers(adapter);
+	if (rc)
+		return rc;
+
+	rc = init_stats_token(adapter);
+	if (rc)
+		return rc;
+
 	return rc;
 }
 
@@ -4538,6 +4536,9 @@ static int ibmvnic_remove(struct vio_dev *dev)
 	release_sub_crqs(adapter, 1);
 	release_crq_queue(adapter);
 
+	release_stats_token(adapter);
+	release_stats_buffers(adapter);
+
 	adapter->state = VNIC_REMOVED;
 
 	mutex_unlock(&adapter->reset_lock);
-- 
2.13.6