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Date: Wed, 23 Feb 2022 22:40:31 -0800
From: Tong Zhang <ztong0001@...il.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Tong Zhang <ztong0001@...il.com>,
Kees Cook <keescook@...omium.org>,
Jakub Kicinski <kuba@...nel.org>,
Colin Ian King <colin.i.king@...glemail.com>,
Lee Jones <lee.jones@...aro.org>,
Saurav Girepunje <saurav.girepunje@...il.com>,
Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>,
Johan Hovold <johan@...nel.org>, linux-staging@...ts.linux.dev,
linux-kernel@...r.kernel.org
Cc: dan.carpenter@...cle.com
Subject: [PATCH v2 3/3] staging: rtl8192u: rework init and exit function
The init and exit functions are not releasing resource properly. An error
can be observed when we load/unload/load r8192u_usb module due to this
issue. This patch rework init and exit functions to do proper resource
release on init error and module unload.
The __exit attribute is stripped from some functions since they are now
being used by module init functions.
[ 493.068012] proc_dir_entry 'net/ieee80211' already registered
[ 493.271973] proc_mkdir+0x18/0x20
[ 493.272136] ieee80211_debug_init+0x28/0xde8 [r8192u_usb]
[ 493.272404] rtl8192_usb_module_init+0x10/0x161 [r8192u_usb]
[ 13.910616] proc_dir_entry 'net/rtl819xU' already registered
[ 13.918931] proc_mkdir+0x18/0x20
[ 13.919098] rtl8192_usb_module_init+0x142/0x16d [r8192u_usb]
Signed-off-by: Tong Zhang <ztong0001@...il.com>
---
.../rtl8192u/ieee80211/ieee80211_crypt.c | 2 +-
.../rtl8192u/ieee80211/ieee80211_crypt_ccmp.c | 2 +-
.../rtl8192u/ieee80211/ieee80211_crypt_tkip.c | 2 +-
.../rtl8192u/ieee80211/ieee80211_crypt_wep.c | 2 +-
.../rtl8192u/ieee80211/ieee80211_module.c | 2 +-
drivers/staging/rtl8192u/r8192U_core.c | 45 ++++++++++++++-----
6 files changed, 38 insertions(+), 17 deletions(-)
diff --git a/drivers/staging/rtl8192u/ieee80211/ieee80211_crypt.c b/drivers/staging/rtl8192u/ieee80211/ieee80211_crypt.c
index 01012dddcd73..840db6250b87 100644
--- a/drivers/staging/rtl8192u/ieee80211/ieee80211_crypt.c
+++ b/drivers/staging/rtl8192u/ieee80211/ieee80211_crypt.c
@@ -214,7 +214,7 @@ int __init ieee80211_crypto_init(void)
return ret;
}
-void __exit ieee80211_crypto_deinit(void)
+void ieee80211_crypto_deinit(void)
{
struct list_head *ptr, *n;
diff --git a/drivers/staging/rtl8192u/ieee80211/ieee80211_crypt_ccmp.c b/drivers/staging/rtl8192u/ieee80211/ieee80211_crypt_ccmp.c
index ccff385cf1f8..101c28265e91 100644
--- a/drivers/staging/rtl8192u/ieee80211/ieee80211_crypt_ccmp.c
+++ b/drivers/staging/rtl8192u/ieee80211/ieee80211_crypt_ccmp.c
@@ -415,7 +415,7 @@ int __init ieee80211_crypto_ccmp_init(void)
return ieee80211_register_crypto_ops(&ieee80211_crypt_ccmp);
}
-void __exit ieee80211_crypto_ccmp_exit(void)
+void ieee80211_crypto_ccmp_exit(void)
{
ieee80211_unregister_crypto_ops(&ieee80211_crypt_ccmp);
}
diff --git a/drivers/staging/rtl8192u/ieee80211/ieee80211_crypt_tkip.c b/drivers/staging/rtl8192u/ieee80211/ieee80211_crypt_tkip.c
index e8fa1d385f24..689d8843f538 100644
--- a/drivers/staging/rtl8192u/ieee80211/ieee80211_crypt_tkip.c
+++ b/drivers/staging/rtl8192u/ieee80211/ieee80211_crypt_tkip.c
@@ -712,7 +712,7 @@ int __init ieee80211_crypto_tkip_init(void)
return ieee80211_register_crypto_ops(&ieee80211_crypt_tkip);
}
-void __exit ieee80211_crypto_tkip_exit(void)
+void ieee80211_crypto_tkip_exit(void)
{
ieee80211_unregister_crypto_ops(&ieee80211_crypt_tkip);
}
diff --git a/drivers/staging/rtl8192u/ieee80211/ieee80211_crypt_wep.c b/drivers/staging/rtl8192u/ieee80211/ieee80211_crypt_wep.c
index a41b6510481b..8a51ea1dd6e5 100644
--- a/drivers/staging/rtl8192u/ieee80211/ieee80211_crypt_wep.c
+++ b/drivers/staging/rtl8192u/ieee80211/ieee80211_crypt_wep.c
@@ -240,7 +240,7 @@ int __init ieee80211_crypto_wep_init(void)
return ieee80211_register_crypto_ops(&ieee80211_crypt_wep);
}
-void __exit ieee80211_crypto_wep_exit(void)
+void ieee80211_crypto_wep_exit(void)
{
ieee80211_unregister_crypto_ops(&ieee80211_crypt_wep);
}
diff --git a/drivers/staging/rtl8192u/ieee80211/ieee80211_module.c b/drivers/staging/rtl8192u/ieee80211/ieee80211_module.c
index c52540b734fd..b94fe9b449b6 100644
--- a/drivers/staging/rtl8192u/ieee80211/ieee80211_module.c
+++ b/drivers/staging/rtl8192u/ieee80211/ieee80211_module.c
@@ -276,7 +276,7 @@ int __init ieee80211_debug_init(void)
return 0;
}
-void __exit ieee80211_debug_exit(void)
+void ieee80211_debug_exit(void)
{
if (ieee80211_proc) {
remove_proc_entry("debug_level", ieee80211_proc);
diff --git a/drivers/staging/rtl8192u/r8192U_core.c b/drivers/staging/rtl8192u/r8192U_core.c
index 364e1ca94f70..ce807c9d4219 100644
--- a/drivers/staging/rtl8192u/r8192U_core.c
+++ b/drivers/staging/rtl8192u/r8192U_core.c
@@ -4783,49 +4783,70 @@ static int __init rtl8192_usb_module_init(void)
{
int ret;
-#ifdef CONFIG_IEEE80211_DEBUG
+ pr_info("\nLinux kernel driver for RTL8192 based WLAN cards\n");
+ pr_info("Copyright (c) 2007-2008, Realsil Wlan\n");
+ RT_TRACE(COMP_INIT, "Initializing module");
+ RT_TRACE(COMP_INIT, "Wireless extensions version %d", WIRELESS_EXT);
+
ret = ieee80211_debug_init();
if (ret) {
pr_err("ieee80211_debug_init() failed %d\n", ret);
return ret;
}
-#endif
+
ret = ieee80211_crypto_init();
if (ret) {
pr_err("ieee80211_crypto_init() failed %d\n", ret);
- return ret;
+ goto debug_exit;
}
ret = ieee80211_crypto_tkip_init();
if (ret) {
pr_err("ieee80211_crypto_tkip_init() failed %d\n", ret);
- return ret;
+ goto crypto_exit;
}
ret = ieee80211_crypto_ccmp_init();
if (ret) {
pr_err("ieee80211_crypto_ccmp_init() failed %d\n", ret);
- return ret;
+ goto crypto_tkip_exit;
}
ret = ieee80211_crypto_wep_init();
if (ret) {
pr_err("ieee80211_crypto_wep_init() failed %d\n", ret);
- return ret;
+ goto crypto_ccmp_exit;
}
- pr_info("\nLinux kernel driver for RTL8192 based WLAN cards\n");
- pr_info("Copyright (c) 2007-2008, Realsil Wlan\n");
- RT_TRACE(COMP_INIT, "Initializing module");
- RT_TRACE(COMP_INIT, "Wireless extensions version %d", WIRELESS_EXT);
rtl8192_proc_module_init();
- return usb_register(&rtl8192_usb_driver);
+ ret = usb_register(&rtl8192_usb_driver);
+ if (ret)
+ goto rtl8192_proc_module_exit;
+ return ret;
+
+rtl8192_proc_module_exit:
+ remove_proc_entry(RTL819XU_MODULE_NAME, init_net.proc_net);
+ ieee80211_crypto_wep_exit();
+crypto_ccmp_exit:
+ ieee80211_crypto_ccmp_exit();
+crypto_tkip_exit:
+ ieee80211_crypto_tkip_exit();
+crypto_exit:
+ ieee80211_crypto_deinit();
+debug_exit:
+ ieee80211_debug_exit();
+ return ret;
}
static void __exit rtl8192_usb_module_exit(void)
{
usb_deregister(&rtl8192_usb_driver);
-
+ remove_proc_entry(RTL819XU_MODULE_NAME, init_net.proc_net);
+ ieee80211_crypto_wep_exit();
+ ieee80211_crypto_ccmp_exit();
+ ieee80211_crypto_tkip_exit();
+ ieee80211_crypto_deinit();
+ ieee80211_debug_exit();
RT_TRACE(COMP_DOWN, "Exiting");
}
--
2.25.1
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