linux-kernel - Re: staging: r8188eu: how to handle nested mutex under spinlock

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Message-ID: <20220404133312.GC3293@kadam>
Date:   Mon, 4 Apr 2022 16:33:13 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Michael Straube <straube.linux@...il.com>
Cc:     "Fabio M. De Francesco" <fmdefrancesco@...il.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        Larry Finger <Larry.Finger@...inger.net>,
        Phillip Potter <phil@...lpotter.co.uk>,
        "open list:STAGING SUBSYSTEM" <linux-staging@...ts.linux.dev>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: staging: r8188eu: how to handle nested mutex under spinlock

On Sun, Apr 03, 2022 at 02:18:04PM +0200, Michael Straube wrote:
> On 4/3/22 14:10, Fabio M. De Francesco wrote:
> > For a list of all the paths to a given function you may use Smatch:
> > 
> > ./smatch/smatch_data/db/smdb.py ips_leave
> > 
> > or
> > 
> > ./smatch/smatch_data/db/smdb.py call_tree ips_leave
> > 
> > But perhaps you already know how to do it.
> 
> Yes, but thank you anyway. :)
> 

My email (gmail account) has been so weird recently.  I don't know why
I'm not getting Fabio's emails...  Presumably they will show up in a few
days.

The other command to use is:

$ ./smatch/smatch_data/db/smdb.py preempt ips_leave
rtw_set_802_11_disassociate() <- disables preempt
-> _rtw_pwr_wakeup()
   -> LeaveAllPowerSaveMode()
      -> ips_leave()

I save that to a file, open it with with vim and run a vim function
`hall` (for highlight all) from my .vimrc file.

" Use :hall to highlight all the words in a file (for debugging sleeping bugs)
function HLall()
  let a=[]
  %s/\w\+/\=add(a, submatch(0))/gn
  let @/ = join(a, "\\|")
endfunction
cnoreabbrev hall call HLall() <CR>:set hls<CR>

That highlights all the functions is the call tree, then I use cscope to
jump to rtw_set_802_11_disassociate and follow the highlighted functions
to ips_leave().

regards,
dan carpenter