linux-kernel - Re: [PATCH v2] staging: r8188eu: Provide a TODO file for this driver

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Date:   Sat, 09 Oct 2021 18:31:12 +0200
From:   "Fabio M. De Francesco" <fmdefrancesco@...il.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>,
        linux-staging@...ts.linux.dev
Cc:     gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] staging: r8188eu: Provide a TODO file for this driver

On Thursday, August 26, 2021 3:54:13 PM CEST Dan Carpenter wrote:
> Another thing to fix are some of the sleeping in atomic bugs.
> 
> drivers/staging/r8188eu/core/rtw_ap.c:139 update_BCNTIM() warn: sleeping in 
atomic context
> drivers/staging/r8188eu/core/rtw_ap.c:1296 update_bcn_wps_ie() warn: 
sleeping in atomic context
> drivers/staging/r8188eu/core/rtw_ap.c:1361 update_beacon() warn: sleeping 
in atomic context
> drivers/staging/r8188eu/core/rtw_ap.c:1725 ap_free_sta() warn: sleeping in 
atomic context
> drivers/staging/r8188eu/core/rtw_pwrctrl.c:79 ips_leave() warn: sleeping in 
atomic context
> drivers/staging/r8188eu/core/rtw_pwrctrl.c:81 ips_leave() warn: sleeping in 
atomic context
> drivers/staging/r8188eu/core/rtw_mlme_ext.c:6764 receive_disconnect() warn: 
sleeping in atomic context
> drivers/staging/r8188eu/core/rtw_mlme_ext.c:7083 report_del_sta_event() 
warn: sleeping in atomic context
> drivers/staging/r8188eu/core/rtw_mlme_ext.c:8133 set_tx_beacon_cmd() warn: 
sleeping in atomic context
> drivers/staging/r8188eu/os_dep/mlme_linux.c:117 rtw_report_sec_ie() warn: 
sleeping in atomic context
> 
> There are a few in rtl8723bs as well since the code came from the same
> place.
> 
> drivers/staging/rtl8723bs/core/rtw_ap.c:1601 update_beacon() warn: sleeping 
in atomic context
> drivers/staging/rtl8723bs/core/rtw_ap.c:1919 ap_free_sta() warn: sleeping 
in atomic context
> drivers/staging/rtl8723bs/core/rtw_mlme_ext.c:4270 receive_disconnect() 
warn: sleeping in atomic context
> drivers/staging/rtl8723bs/hal/hal_intf.c:100 rtw_hal_init() warn: sleeping 
in atomic context
> 
> regards,
> dan carpenter
> 
Hello Dan,

I'd like to address these kind of bugs, but I have a couple of questions 
about them.

1) You've listed what looks like the output of a compiler or static analyzer. 
How did you get the warnings you copy-pasted above?

2) I know that both the execution of interrupt handlers (ISRs) as well as any 
code blocks that are executed holding spinlocks are "atomic contexts". In 
these cases, "sleeping" is not allowed (for obvious reasons). Besides the two 
mentioned above, are there any further cases of "atomic contexts" in the 
kernel? 

Thank you in advance,

Fabio