linux-kernel - [PATCH] wifi: rtw89: Add missing check for alloc

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Date:   Wed,  4 Jan 2023 22:23:53 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     leon@...nel.org
Cc:     pkshih@...ltek.com, kvalo@...nel.org, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: [PATCH] wifi: rtw89: Add missing check for alloc_workqueue

On Wed, Jan 04, 2023 at 07:41:36PM +0800, Leon Romanovsky wrote:
> On Wed, Jan 04, 2023 at 05:33:53PM +0800, Jiasheng Jiang wrote:
>> Add check for the return value of alloc_workqueue since it may return
>> NULL pointer.
>> 
>> Fixes: e3ec7017f6a2 ("rtw89: add Realtek 802.11ax driver")
>> Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
>> ---
>>  drivers/net/wireless/realtek/rtw89/core.c | 2 ++
>>  1 file changed, 2 insertions(+)
>> 
>> diff --git a/drivers/net/wireless/realtek/rtw89/core.c b/drivers/net/wireless/realtek/rtw89/core.c
>> index 931aff8b5dc9..006fe0499f81 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;
> 
> While the change is fixing one issue, you are adding another one.
> There is no destroy of this workqueue if rtw89_load_firmware fails.

Actually, I do not think the missing of destroy_workqueue is introduced by me.
Even without my patch, the destroy_workqueue is still missing.
Anyway, I will submit a v2 that adds the missing destroy_workqueue.

Thanks,
Jiang