linux-kernel - [PATCH v2] driver core: platform: Respect return code of platform_device_register

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Message-Id: <20181203182141.29720-1-andriy.shevchenko@linux.intel.com>
Date:   Mon,  3 Dec 2018 20:21:41 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        linux-kernel@...r.kernel.org,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v2] driver core: platform: Respect return code of platform_device_register_full()

The platform_device_register_full() might return an error pointer. If we
instantiate platform device which is optional we may simplify the routine at
removal stage by simply calling platform_device_unregister(). For now it
requires to check parameter for being an error pointer in each caller.

To make users' life easier, check for an error pointer inside driver core.

Reported-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
- rebase on top of linux-next since the conflicting patch has been applied there

 drivers/base/platform.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 0fb5f140f1b0..2c36bf490944 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -234,7 +234,7 @@ struct platform_object {
  */
 void platform_device_put(struct platform_device *pdev)
 {
-	if (pdev)
+	if (!IS_ERR_OR_NULL(pdev))
 		put_device(&pdev->dev);
 }
 EXPORT_SYMBOL_GPL(platform_device_put);
@@ -447,7 +447,7 @@ void platform_device_del(struct platform_device *pdev)
 {
 	int i;
 
-	if (pdev) {
+	if (!IS_ERR_OR_NULL(pdev)) {
 		device_del(&pdev->dev);
 
 		if (pdev->id_auto) {
-- 
2.19.2