linux-kernel - [PATCH] nvmem: fix unregistering device in nvmem

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Date:   Tue, 21 Dec 2021 16:45:50 +0100
From:   Rafał Miłecki <zajec5@...il.com>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     Johan Hovold <johan@...nel.org>,
        Andrey Smirnov <andrew.smirnov@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org,
        Rafał Miłecki <rafal@...ecki.pl>
Subject: [PATCH] nvmem: fix unregistering device in nvmem_register() error path

From: Rafał Miłecki <rafal@...ecki.pl>

1. Drop incorrect put_device() calls

If device_register() fails then underlaying device_add() takes care of
calling put_device() if needed. There is no need to do that in a driver.

2. Use device_unregister()

Now that we don't call put_device() we can use above helper.

Fixes: 3360acdf8391 ("nvmem: core: fix leaks on registration errors")
Cc: Johan Hovold <johan@...nel.org>
Signed-off-by: Rafał Miłecki <rafal@...ecki.pl>
---
That put_device() was explicitly added by Johan but after checking
device_register() twice I still think it's incorrect. I hope I didn't
miss sth obvious and I didn't mess it up.
---
 drivers/nvmem/core.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index 785a56e33f69..f7f31af7226f 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -901,12 +901,12 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config)
 
 	rval = device_register(&nvmem->dev);
 	if (rval)
-		goto err_put_device;
+		return ERR_PTR(rval);
 
 	if (config->compat) {
 		rval = nvmem_sysfs_setup_compat(nvmem, config);
 		if (rval)
-			goto err_device_del;
+			goto err_device_unreg;
 	}
 
 	if (config->cells) {
@@ -932,10 +932,8 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config)
 err_teardown_compat:
 	if (config->compat)
 		nvmem_sysfs_remove_compat(nvmem, config);
-err_device_del:
-	device_del(&nvmem->dev);
-err_put_device:
-	put_device(&nvmem->dev);
+err_device_unreg:
+	device_unregister(&nvmem->dev);
 
 	return ERR_PTR(rval);
 }
-- 
2.31.1