netdev - [PATCH] wifi: cfg80211: Fix not unregister reg_pdev when load_builtin_regdb

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Date:   Wed, 9 Nov 2022 17:02:37 +0800
From:   Chen Zhongjin <chenzhongjin@...wei.com>
To:     <linux-kernel@...r.kernel.org>, <linux-wireless@...r.kernel.org>,
        <netdev@...r.kernel.org>
CC:     <johannes@...solutions.net>, <davem@...emloft.net>,
        <edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <chenzhongjin@...wei.com>
Subject: [PATCH] wifi: cfg80211: Fix not unregister reg_pdev when load_builtin_regdb_keys() fails

In regulatory_init_db(), when it's going to return a error, reg_pdev
should be unregistered. When load_builtin_regdb_keys() fails it doesn't
do it and makes cfg80211 can't be reload with report:

sysfs: cannot create duplicate filename '/devices/platform/regulatory.0'
 ...
 <TASK>
 dump_stack_lvl+0x79/0x9b
 sysfs_warn_dup.cold+0x1c/0x29
 sysfs_create_dir_ns+0x22d/0x290
 kobject_add_internal+0x247/0x800
 kobject_add+0x135/0x1b0
 device_add+0x389/0x1be0
 platform_device_add+0x28f/0x790
 platform_device_register_full+0x376/0x4b0
 regulatory_init+0x9a/0x4b2 [cfg80211]
 cfg80211_init+0x84/0x113 [cfg80211]
 ...

Fixes: 90a53e4432b1 ("cfg80211: implement regdb signature checking")
Signed-off-by: Chen Zhongjin <chenzhongjin@...wei.com>
---
 net/wireless/reg.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index d5c7a5aa6853..da0cb5abc20f 100644
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -4305,8 +4305,10 @@ static int __init regulatory_init_db(void)
 		return -EINVAL;

 	err = load_builtin_regdb_keys();
-	if (err)
+	if (err) {
+		platform_device_unregister(reg_pdev);
 		return err;
+	}

 	/* We always try to get an update for the static regdomain */
 	err = regulatory_hint_core(cfg80211_world_regdom->alpha2);
-- 
2.17.1