[PATCH AUTOSEL 6.10 04/27] wifi: rtlwifi: handle return value of usb init TX/RX

Sasha Levin
2024-07-28T00:53:37Z

From: Ping-Ke Shih <pkshih@realtek.com>

[ Upstream commit 9c4fde42cce05719120cf892a44b76ff61d908c7 ]

Handle error code to cause failed to USB probe result from unexpected
USB EP number, otherwise when USB disconnect skb_dequeue() an uninitialized
skb list and cause warnings below.

usb 2-1: USB disconnect, device number 76
INFO: trying to register non-static key.
The code is fine but needs lockdep annotation, or maybe
you didn't initialize this object before use?
turning off the locking correctness validator.
CPU: 0 PID: 54060 Comm: kworker/0:1 Not tainted 6.9.0-rc7 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.2-0-gea1b7a073390-prebuilt.qemu.org 04/01/2014
Workqueue: usb_hub_wq hub_event
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x116/0x1b0 lib/dump_stack.c:114
assign_lock_key kernel/locking/lockdep.c:976 [inline]
register_lock_class+0xc18/0xfa0 kernel/locking/lockdep.c:1289
__lock_acquire+0x108/0x3bc0 kernel/locking/lockdep.c:5014
lock_acquire kernel/locking/lockdep.c:5754 [inline]
lock_acquire+0x1b0/0x550 kernel/locking/lockdep.c:5719
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x3d/0x60 kernel/locking/spinlock.c:162
skb_dequeue+0x20/0x180 net/core/skbuff.c:3846
rtl_usb_cleanup drivers/net/wireless/realtek/rtlwifi/usb.c:706 [inline]
rtl_usb_deinit drivers/net/wireless/realtek/rtlwifi/usb.c:721 [inline]
rtl_usb_disconnect+0x4a4/0x850 drivers/net/wireless/realtek/rtlwifi/usb.c:1051
usb_unbind_interface+0x1e8/0x980 drivers/usb/core/driver.c:461
device_remove drivers/base/dd.c:568 [inline]
device_remove+0x122/0x170 drivers/base/dd.c:560
__device_release_driver drivers/base/dd.c:1270 [inline]
device_release_driver_internal+0x443/0x620 drivers/base/dd.c:1293
bus_remove_device+0x22f/0x420 drivers/base/bus.c:574
device_del+0x395/0x9f0 drivers/base/core.c:3909
usb_disable_device+0x360/0x7b0 drivers/usb/core/message.c:1418
usb_disconnect+0x2db/0x930 drivers/usb/core/hub.c:2305
hub_port_connect drivers/usb/core/hub.c:5362 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5662 [inline]
port_event drivers/usb/core/hub.c:5822 [inline]
hub_event+0x1e39/0x4ce0 drivers/usb/core/hub.c:5904
process_one_work+0x97b/0x1a90 kernel/workqueue.c:3267
process_scheduled_works kernel/workqueue.c:3348 [inline]
worker_thread+0x680/0xf00 kernel/workqueue.c:3429
kthread+0x2c7/0x3b0 kernel/kthread.c:388
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>

Reported-by: Shichao Lai <shichaorai@gmail.com>
Closes: https://lore.kernel.org/linux-wireless/CAEk6kZuuezkH1dVRJf3EAVZK-83=OpTz62qCugkpTkswj8JF6w@mail.gmail.com/T/#u
Tested-by: Shichao Lai <shichaorai@gmail.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://msgid.link/20240524003248.5952-1-pkshih@realtek.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/wireless/realtek/rtlwifi/usb.c | 34 +++++++++++++++++-----
1 file changed, 26 insertions(+), 8 deletions(-)

diff --git a/drivers/net/wireless/realtek/rtlwifi/usb.c b/drivers/net/wireless/realtek/rtlwifi/usb.c
index 2ea72d9e39577..4d2931e544278 100644
--- a/drivers/net/wireless/realtek/rtlwifi/usb.c
+++ b/drivers/net/wireless/realtek/rtlwifi/usb.c
@@ -23,6 +23,8 @@ MODULE_DESCRIPTION("USB basic driver for rtlwifi");

#define MAX_USBCTRL_VENDORREQ_TIMES 10

+static void _rtl_usb_cleanup_tx(struct ieee80211_hw *hw);
+
static void _usbctrl_vendorreq_sync(struct usb_device *udev, u8 reqtype,
u16 value, void *pdata, u16 len)
{
@@ -285,9 +287,23 @@ static int _rtl_usb_init(struct ieee80211_hw *hw)
}
/* usb endpoint mapping */
err = rtlpriv->cfg->usb_interface_cfg->usb_endpoint_mapping(hw);
- rtlusb->usb_mq_to_hwq = rtlpriv->cfg->usb_interface_cfg->usb_mq_to_hwq;
- _rtl_usb_init_tx(hw);
- _rtl_usb_init_rx(hw);
+ if (err)
+ return err;
+
+ rtlusb->usb_mq_to_hwq = rtlpriv->cfg->usb_interface_cfg->usb_mq_to_hwq;
+
+ err = _rtl_usb_init_tx(hw);
+ if (err)
+ return err;
+
+ err = _rtl_usb_init_rx(hw);
+ if (err)
+ goto err_out;
+
+ return 0;
+
+err_out:
+ _rtl_usb_cleanup_tx(hw);
return err;
}

@@ -691,17 +707,13 @@ static int rtl_usb_start(struct ieee80211_hw *hw)
}

/*======================= tx =========================================*/
-static void rtl_usb_cleanup(struct ieee80211_hw *hw)
+static void _rtl_usb_cleanup_tx(struct ieee80211_hw *hw)
{
u32 i;
struct sk_buff *_skb;
struct rtl_usb *rtlusb = rtl_usbdev(rtl_usbpriv(hw));
struct ieee80211_tx_info *txinfo;

- /* clean up rx stuff. */
- _rtl_usb_cleanup_rx(hw);
-
- /* clean up tx stuff */
for (i = 0; i < RTL_USB_MAX_EP_NUM; i++) {
while ((_skb = skb_dequeue(&rtlusb->tx_skb_queue[i]))) {
rtlusb->usb_tx_cleanup(hw, _skb);
@@ -715,6 +727,12 @@ static void rtl_usb_cleanup(struct ieee80211_hw *hw)
usb_kill_anchored_urbs(&rtlusb->tx_submitted);
}

+static void rtl_usb_cleanup(struct ieee80211_hw *hw)
+{
+ _rtl_usb_cleanup_rx(hw);
+ _rtl_usb_cleanup_tx(hw);
+}
+
/* We may add some struct into struct rtl_usb later. Do deinit here. */
static void rtl_usb_deinit(struct ieee80211_hw *hw)
{
--
2.43.0