linux-kernel - Re: drivers/net/wireless/realtek/rtw88/mac.c:748 __rtw_download

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Date:   Tue, 06 Jun 2023 16:34:06 +0300
From:   Kalle Valo <kvalo@...nel.org>
To:     Dan Carpenter <dan.carpenter@...aro.org>
Cc:     oe-kbuild@...ts.linux.dev, Sascha Hauer <s.hauer@...gutronix.de>,
        lkp@...el.com, oe-kbuild-all@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org
Subject: Re: drivers/net/wireless/realtek/rtw88/mac.c:748 __rtw_download_firmware() warn: missing unwind goto?

Adding linux-wireless, top posting so that the whole report is included.

Dan Carpenter <dan.carpenter@...aro.org> writes:

> Hi Sascha,
>
> First bad commit (maybe != root cause):
>
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   9561de3a55bed6bdd44a12820ba81ec416e705a7
> commit: 45794099f5e1d7abc5eb07e6eec7e1e5c6cb540d wifi: rtw88: Add
> rtw8822bu chipset support
> config: riscv-randconfig-m031-20230605
> (https://download.01.org/0day-ci/archive/20230605/202306052310.OVhcUjZ3-lkp@intel.com/config)
> compiler: riscv64-linux-gcc (GCC) 12.3.0
>
> If you fix the issue, kindly add following tag where applicable
> | Reported-by: kernel test robot <lkp@...el.com>
> | Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
> | Closes: https://lore.kernel.org/r/202306052310.OVhcUjZ3-lkp@intel.com/
>
> smatch warnings:
> drivers/net/wireless/realtek/rtw88/mac.c:748 __rtw_download_firmware()
> warn: missing unwind goto?
>
> vim +748 drivers/net/wireless/realtek/rtw88/mac.c
>
> 3d8bf50860c7de Yan-Hsuan Chuang 2020-04-24 717 static int
> __rtw_download_firmware(struct rtw_dev *rtwdev,
> 3d8bf50860c7de Yan-Hsuan Chuang 2020-04-24 718 struct rtw_fw_state
> *fw)
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26  719  {
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26 720 struct rtw_backup_info
> bckp[DLFW_RESTORE_REG_NUM];
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26 721 const u8 *data =
> fw->firmware->data;
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26  722  	u32 size = fw->firmware->size;
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26  723  	u32 ltecoex_bckp;
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26  724  	int ret;
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26  725  
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26 726 if
> (!check_firmware_size(data, size))
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26  727  		return -EINVAL;
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26  728  
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26 729 if
> (!ltecoex_read_reg(rtwdev, 0x38, &ltecoex_bckp))
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26  730  		return -EBUSY;
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26  731  
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26 732 wlan_cpu_enable(rtwdev,
> false);
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26  733  
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26 734
> download_firmware_reg_backup(rtwdev, bckp);
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26 735
> download_firmware_reset_platform(rtwdev);
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26  736  
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26 737 ret =
> start_download_firmware(rtwdev, data, size);
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26  738  	if (ret)
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26  739  		goto dlfw_fail;
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26  740  
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26 741
> download_firmware_reg_restore(rtwdev, bckp, DLFW_RESTORE_REG_NUM);
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26  742  
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26 743
> download_firmware_end_flow(rtwdev);
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26  744  
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26  745  	wlan_cpu_enable(rtwdev, true);
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26  746  
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26 747 if
> (!ltecoex_reg_write(rtwdev, 0x38, ltecoex_bckp))
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26 @748  		return -EBUSY;
>
> All the other error paths goto dlfw_fail;
>
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26  749  
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26 750 ret =
> download_firmware_validate(rtwdev);
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26  751  	if (ret)
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26  752  		goto dlfw_fail;
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26  753  
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26  754  	/* reset desc and index */
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26  755  	rtw_hci_setup(rtwdev);
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26  756  
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26  757  	rtwdev->h2c.last_box_num = 0;
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26  758  	rtwdev->h2c.seq = 0;
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26  759  
> 3c519605850890 Yan-Hsuan Chuang 2019-10-02 760
> set_bit(RTW_FLAG_FW_RUNNING, rtwdev->flags);
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26  761  
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26  762  	return 0;
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26  763  
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26  764  dlfw_fail:
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26  765  	/* Disable FWDL_EN */
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26 766 rtw_write8_clr(rtwdev,
> REG_MCUFW_CTRL, BIT_MCUFWDL_EN);
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26 767 rtw_write8_set(rtwdev,
> REG_SYS_FUNC_EN + 1, BIT_FEN_CPUEN);
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26  768  
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26  769  	return ret;
> e3037485c68ec1 Yan-Hsuan Chuang 2019-04-26  770  }

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