linux-kernel - [PATCH 4.14 033/164] firmware: vpd: Fix platform driver and device registration/unregistration

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Date:   Tue, 12 Dec 2017 13:43:33 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Guenter Roeck <linux@...ck-us.net>,
        Randy Dunlap <rdunlap@...radead.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>
Subject: [PATCH 4.14 033/164] firmware: vpd: Fix platform driver and device registration/unregistration

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Guenter Roeck <linux@...ck-us.net>

commit 0631fb8b027f5968c2f5031f0b3ff7be3e4bebcc upstream.

The driver exit function needs to unregister both platform device and
driver. Also, during registration, register driver first and perform
error checks.

Fixes: 049a59db34eb ("firmware: Google VPD sysfs driver")
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
Tested-by: Randy Dunlap <rdunlap@...radead.org>
Reviewed-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/firmware/google/vpd.c |   20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

--- a/drivers/firmware/google/vpd.c
+++ b/drivers/firmware/google/vpd.c
@@ -326,21 +326,29 @@ static struct platform_driver vpd_driver
 	},
 };
 
+static struct platform_device *vpd_pdev;
+
 static int __init vpd_platform_init(void)
 {
-	struct platform_device *pdev;
-
-	pdev = platform_device_register_simple("vpd", -1, NULL, 0);
-	if (IS_ERR(pdev))
-		return PTR_ERR(pdev);
+	int ret;
 
-	platform_driver_register(&vpd_driver);
+	ret = platform_driver_register(&vpd_driver);
+	if (ret)
+		return ret;
+
+	vpd_pdev = platform_device_register_simple("vpd", -1, NULL, 0);
+	if (IS_ERR(vpd_pdev)) {
+		platform_driver_unregister(&vpd_driver);
+		return PTR_ERR(vpd_pdev);
+	}
 
 	return 0;
 }
 
 static void __exit vpd_platform_exit(void)
 {
+	platform_device_unregister(vpd_pdev);
+	platform_driver_unregister(&vpd_driver);
 }
 
 module_init(vpd_platform_init);