linux-kernel - [PATCH 4.14 032/164] firmware: vpd: Tie firmware kobject to device lifetime

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Date:   Tue, 12 Dec 2017 13:43:32 +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>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Randy Dunlap <rdunlap@...radead.org>
Subject: [PATCH 4.14 032/164] firmware: vpd: Tie firmware kobject to device lifetime

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

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

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

commit e4b28b3c3a405b251fa25db58abe1512814a680a upstream.

It doesn't make sense to have /sys/firmware/vpd if the device is not
instantiated, so tie its lifetime to the device.

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

---
 drivers/firmware/google/vpd.c |   19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

--- a/drivers/firmware/google/vpd.c
+++ b/drivers/firmware/google/vpd.c
@@ -295,7 +295,17 @@ static int vpd_probe(struct platform_dev
 	if (ret)
 		return ret;
 
-	return vpd_sections_init(entry.cbmem_addr);
+	vpd_kobj = kobject_create_and_add("vpd", firmware_kobj);
+	if (!vpd_kobj)
+		return -ENOMEM;
+
+	ret = vpd_sections_init(entry.cbmem_addr);
+	if (ret) {
+		kobject_put(vpd_kobj);
+		return ret;
+	}
+
+	return 0;
 }
 
 static int vpd_remove(struct platform_device *pdev)
@@ -303,6 +313,8 @@ static int vpd_remove(struct platform_de
 	vpd_section_destroy(&ro_vpd);
 	vpd_section_destroy(&rw_vpd);
 
+	kobject_put(vpd_kobj);
+
 	return 0;
 }
 
@@ -322,10 +334,6 @@ static int __init vpd_platform_init(void
 	if (IS_ERR(pdev))
 		return PTR_ERR(pdev);
 
-	vpd_kobj = kobject_create_and_add("vpd", firmware_kobj);
-	if (!vpd_kobj)
-		return -ENOMEM;
-
 	platform_driver_register(&vpd_driver);
 
 	return 0;
@@ -333,7 +341,6 @@ static int __init vpd_platform_init(void
 
 static void __exit vpd_platform_exit(void)
 {
-	kobject_put(vpd_kobj);
 }
 
 module_init(vpd_platform_init);