linux-kernel - [RFC PATCH 2/2] hwmon: (f71805f): Use request_region() in f71805f

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Date:   Fri, 15 Mar 2019 00:55:16 +0800
From:   John Garry <john.garry@...wei.com>
To:     <jdelvare@...e.com>, <linux@...ck-us.net>, <bhelgaas@...gle.com>,
        <rafael@...nel.org>, <arnd@...db.de>, <lorenzo.pieralisi@....com>,
        <bp@...e.de>
CC:     <linux-hwmon@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-pci@...r.kernel.org>, <wangkefeng.wang@...wei.com>,
        <linuxarm@...wei.com>, John Garry <john.garry@...wei.com>
Subject: [RFC PATCH 2/2] hwmon: (f71805f): Use request_region() in f71805f_init()

Currently the driver does not call request_region() prior to
accessing IO port regions in f71805f_init(), so add it.

Signed-off-by: John Garry <john.garry@...wei.com>
---
 drivers/hwmon/f71805f.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/hwmon/f71805f.c b/drivers/hwmon/f71805f.c
index 73c681162653..910082c7f184 100644
--- a/drivers/hwmon/f71805f.c
+++ b/drivers/hwmon/f71805f.c
@@ -1617,10 +1617,21 @@ static int __init f71805f_init(void)
 	int err;
 	unsigned short address;
 	struct f71805f_sio_data sio_data;
+	struct resource *res;
+	size_t size = 0x4e - 0x2e + SIO_REG_ADDR + 4;
+
+	/* Request the whole 0x2e - 0x4e region */
+	res = request_region(0x2e, size, "f71805f");
+	if (!res)
+		return -EBUSY;
 
 	if (f71805f_find(0x2e, &address, &sio_data)
-	 && f71805f_find(0x4e, &address, &sio_data))
+	 && f71805f_find(0x4e, &address, &sio_data)) {
+		release_region(0x2e, size);
 		return -ENODEV;
+	}
+
+	release_region(0x2e, size);
 
 	err = platform_driver_register(&f71805f_driver);
 	if (err)
-- 
2.17.1