From: Vadim Pasternak <vadimp@mellanox.com>
Date: Fri, 26 Jan 2018 19:03:45 +0000
Subject: platform/mellanox: mlxreg-hotplug: Add check for negative adapter
 number
Patch-mainline: v4.16-rc1
Git-commit: 7805fa8d78d0ea8c9c5a6603960e8f23901c7f17
References: bsc#1112374

Verify before creation of hotplug device if the associated adapter number
is negative. It could be in case hotplug event is not associated with
hotplug device.

Signed-off-by: Vadim Pasternak <vadimp@mellanox.com>
Signed-off-by: Darren Hart (VMware) <dvhart@infradead.org>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/platform/mellanox/mlxreg-hotplug.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/drivers/platform/mellanox/mlxreg-hotplug.c
+++ b/drivers/platform/mellanox/mlxreg-hotplug.c
@@ -96,6 +96,13 @@ struct mlxreg_hotplug_priv_data {
 static int mlxreg_hotplug_device_create(struct device *dev,
 					struct mlxreg_core_data *data)
 {
+	/*
+	 * Return if adapter number is negative. It could be in case hotplug
+	 * event is not associated with hotplug device.
+	 */
+	if (data->hpdev.nr < 0)
+		return 0;
+
 	data->hpdev.adapter = i2c_get_adapter(data->hpdev.nr);
 	if (!data->hpdev.adapter) {
 		dev_err(dev, "Failed to get adapter for bus %d\n",