RE: [PATCH v2] wifi: rtw89: Add missing check for alloc_workqueue

[Ping-Ke Shih <pkshih@realtek.com>]

> -----Original Message-----
> From: Jiasheng Jiang <jiasheng@iscas.ac.cn>
> Sent: Wednesday, January 4, 2023 10:29 PM
> To: leon@kernel.org
> Cc: Ping-Ke Shih <pkshih@realtek.com>; kvalo@kernel.org; davem@davemloft.net; edumazet@google.com;
> kuba@kernel.org; pabeni@redhat.com; linux-wireless@vger.kernel.org; netdev@vger.kernel.org;
> linux-kernel@vger.kernel.org; Jiasheng Jiang <jiasheng@iscas.ac.cn>
> Subject: [PATCH v2] wifi: rtw89: Add missing check for alloc_workqueue
> 
> Add check for the return value of alloc_workqueue since it may return
> NULL pointer.
> Moreover, add destroy_workqueue when rtw89_load_firmware fails.
> 
> Fixes: e3ec7017f6a2 ("rtw89: add Realtek 802.11ax driver")
> Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>

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

> ---
> CHangelog:
> 
> v1 -> v2:
> 
> 1. Add destroy_workqueue when rtw89_load_firmware fails.
> ---
>  drivers/net/wireless/realtek/rtw89/core.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/net/wireless/realtek/rtw89/core.c b/drivers/net/wireless/realtek/rtw89/core.c
> index 931aff8b5dc9..e99eccf11c76 100644
> --- a/drivers/net/wireless/realtek/rtw89/core.c
> +++ b/drivers/net/wireless/realtek/rtw89/core.c
> @@ -3124,6 +3124,8 @@ int rtw89_core_init(struct rtw89_dev *rtwdev)
>  	INIT_DELAYED_WORK(&rtwdev->cfo_track_work, rtw89_phy_cfo_track_work);
>  	INIT_DELAYED_WORK(&rtwdev->forbid_ba_work, rtw89_forbid_ba_work);
>  	rtwdev->txq_wq = alloc_workqueue("rtw89_tx_wq", WQ_UNBOUND | WQ_HIGHPRI, 0);
> +	if (!rtwdev->txq_wq)
> +		return -ENOMEM;
>  	spin_lock_init(&rtwdev->ba_lock);
>  	spin_lock_init(&rtwdev->rpwm_lock);
>  	mutex_init(&rtwdev->mutex);
> @@ -3149,6 +3151,7 @@ int rtw89_core_init(struct rtw89_dev *rtwdev)
>  	ret = rtw89_load_firmware(rtwdev);
>  	if (ret) {
>  		rtw89_warn(rtwdev, "no firmware loaded\n");
> +		destroy_workqueue(rtwdev->txq_wq);
>  		return ret;
>  	}
>  	rtw89_ser_init(rtwdev);
> --
> 2.25.1