linux-kernel - [patch v11 11/12] platform/mellanox: mlxreg-hotplug: Add check for negative adapter number value

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Date:   Wed, 24 Jan 2018 20:34:57 +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 v11 11/12] platform/mellanox: mlxreg-hotplug: Add check for negative adapter number value

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>
---
 drivers/platform/mellanox/mlxreg-hotplug.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/platform/mellanox/mlxreg-hotplug.c b/drivers/platform/mellanox/mlxreg-hotplug.c
index b891ec7..c806451 100644
--- a/drivers/platform/mellanox/mlxreg-hotplug.c
+++ b/drivers/platform/mellanox/mlxreg-hotplug.c
@@ -95,6 +95,14 @@ struct mlxreg_hotplug_priv_data {
 
 static int mlxreg_hotplug_device_create(struct mlxreg_core_data *data)
 {
+	/*
+	 * Return if adapter number is negative. 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)
 		return -EFAULT;
-- 
2.1.4