linux-kernel - [PATCH 10/11] platform/mellanox: mlxreg-hotplug: Add check for negative adapter number

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Date:   Fri, 26 Jan 2018 19:03:45 +0000
From:   Vadim Pasternak <vadimp@...lanox.com>
To:     dvhart@...radead.org, andy.shevchenko@...il.com,
        gregkh@...uxfoundation.org
Cc:     linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        jiri@...nulli.us, Vadim Pasternak <vadimp@...lanox.com>
Subject: [PATCH 10/11] platform/mellanox: mlxreg-hotplug: Add check for negative adapter number

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@...lanox.com>
Signed-off-by: Darren Hart (VMware) <dvhart@...radead.org>
---
 drivers/platform/mellanox/mlxreg-hotplug.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/platform/mellanox/mlxreg-hotplug.c b/drivers/platform/mellanox/mlxreg-hotplug.c
index 5b3cb66..a37afc1 100644
--- a/drivers/platform/mellanox/mlxreg-hotplug.c
+++ b/drivers/platform/mellanox/mlxreg-hotplug.c
@@ -95,6 +95,13 @@ struct mlxreg_hotplug_priv_data {
 
 static int mlxreg_hotplug_device_create(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",
-- 
2.1.4