linux-kernel - Re: [PATCH 08/17] Add main.c

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Date: Fri, 31 May 2024 09:35:04 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: "Nemanov, Michael" <michael.nemanov@...com>, Kalle Valo
 <kvalo@...nel.org>, Johannes Berg <johannes.berg@...el.com>,
 Breno Leitao <leitao@...ian.org>, Justin Stitt <justinstitt@...gle.com>,
 Kees Cook <keescook@...omium.org>, linux-wireless@...r.kernel.org,
 linux-kernel@...r.kernel.org
Cc: Sabeeh Khan <sabeeh-khan@...com>
Subject: Re: [PATCH 08/17] Add main.c

On 30/05/2024 13:54, Nemanov, Michael wrote:
> 
> 
> On 5/22/2024 12:46 PM, Krzysztof Kozlowski wrote:
>> ... > +} > + > +static int read_version_info(struct cc33xx *cc) > +{ > 
>> + int ret; > + > + cc33xx_info("Wireless driver version %s", 
>> DRV_VERSION); Drop > + > + ret = cc33xx_acx_init_get_fw_versions(cc); 
>>> + if (ret < 0) { > + cc33xx_error("Get FW version FAILED!"); > + 
>> return ret; > + } > + > + cc33xx_info("Wireless firmware version 
>> %u.%u.%u.%u", > + cc->all_versions.fw_ver->major_version, > + 
>> cc->all_versions.fw_ver->minor_version, > + 
>> cc->all_versions.fw_ver->api_version, > + 
>> cc->all_versions.fw_ver->build_version); > + > + cc33xx_info("Wireless 
>> PHY version %u.%u.%u.%u.%u.%u", > + 
>> cc->all_versions.fw_ver->phy_version[5], > + 
>> cc->all_versions.fw_ver->phy_version[4], > + 
>> cc->all_versions.fw_ver->phy_version[3], > + 
>> cc->all_versions.fw_ver->phy_version[2], > + 
>> cc->all_versions.fw_ver->phy_version[1], > + 
>> cc->all_versions.fw_ver->phy_version[0]); > + > + 
>> cc->all_versions.driver_ver = DRV_VERSION; Drop
> You mean drop the trace? Will exposing FW/PHY versions via debugfs be OK?

It's impossible to read your email.

I have no clue what you are referring to.


>>> +} > + > +static int cc33xx_remove(struct platform_device *pdev) Why 
>> remove callback is before probe? Please follow standard driver 
>> convention. This goes immediately after probe.
> Will fix
> 
> [...]
>>> +{ > + struct cc33xx_platdev_data *pdev_data = 
>> dev_get_platdata(&pdev->dev); > + struct cc33xx *cc = 
>> platform_get_drvdata(pdev); > + > + 
>> set_bit(CC33XX_FLAG_DRIVER_REMOVED, &cc->flags); ?!?! Your code is 
>> seriously buggy if you depend on setting bit in remove callback.
> If removal of the CC33xx driver was caused by the removal of its parent 
> SDIO device then all I/O operations will fail as SDIO transport is no 
> longer available. This will eventually trigger the recovery mechanism 
> which in this case is futile. If this flag is set, no recovery is attempted.
> 
> [...]
>>> + return -EINVAL; > + } > + > + hw = 
>> cc33xx_alloc_hw(CC33XX_AGGR_BUFFER_SIZE); > + if (IS_ERR(hw)) { > + 
>> cc33xx_error("can't allocate hw"); Heh? Since when do we print memory 
>> allocation failures? Since when memory allocation returns ERR ptr?
> Will fix
>>> +}; > +MODULE_DEVICE_TABLE(platform, cc33xx_id_table); > + > +static 
>> struct platform_driver cc33xx_driver = { > + .probe = cc33xx_probe, > 
>> + .remove = cc33xx_remove, > + .id_table = cc33xx_id_table, > + 
>> .driver = { > + .name = "cc33xx_driver", > + } > +}; > + > +u32 
>> cc33xx_debug_level = DEBUG_NO_DATAPATH; Why this is global? Why u32? 
>> Why global variable is defined at the end of the file?!?!
> cc33xx_debug_level together with cc33xx_debug/info/error() macros is how 
> all traces were done in drivers/net/wireless/ti/wlcore/ (originally was 
> wl1271_debug/info etc.) It enables / disables traces without rebuilding 
> or even reloading which is very helpful for remote support. These macros 
> map to dynamic_pr_debug / pr_debug. I saw similar wrappers in other 
> wireless drivers (ath12k). This is also why there are plenty of 
> cc33xx_debug() all over the code, most are silent by default.
>>> +
>>> +module_platform_driver(cc33xx_driver);
>>> +
>>> +module_param_named(debug_level, cc33xx_debug_level, uint, 0600);
>>> +MODULE_PARM_DESC(debug_level, "cc33xx debugging level");
>>> +
>>> +MODULE_PARM_DESC(secure_boot_enable, "Enables secure boot and FW downlaod");
>>
>> Eh? why secure boot is module param?
>>
>>> +
>>> +module_param_named(fwlog, fwlog_param, charp, 0);
>>> +MODULE_PARM_DESC(fwlog, "FW logger options: continuous, dbgpins or disable");
>>> +
>>> +module_param(no_recovery, int, 0600);
>>> +MODULE_PARM_DESC(no_recovery, "Prevent HW recovery. FW will remain stuck.");
>>> +
>>> +module_param_named(ht_mode, ht_mode_param, charp, 0400);
>>> +MODULE_PARM_DESC(ht_mode, "Force HT mode: wide or siso20");
>>
>> Does not look like suitable for module params.
> Was useful during development but can be removed
>>> +
>>> +MODULE_LICENSE("GPL v2");
>>> +MODULE_DESCRIPTION("Texas Instruments CC33xx WLAN driver");
>>> +MODULE_AUTHOR("Michael Nemanov <michael.nemanov@...com>");
>>> +MODULE_AUTHOR("Sabeeh Khan <sabeeh-khan@...com>");
>>> +
>>> +MODULE_VERSION(DRV_VERSION);
>>
>> Drop.
> I saw other drivers use this, is it no longer allowed?

Was never allowed. There is only one version: the kernel version. There
were many comments already explaining why "driver version" is
wrong/meaningless.

Best regards,
Krzysztof