From mboxrd@z Thu Jan  1 00:00:00 1970
From: matti.vaittinen@fi.rohmeurope.com (Matti Vaittinen)
Date: Tue, 30 Oct 2018 13:57:17 +0200
Subject: [me: Does Rockchip RK808 driver unload work as intended?]
Message-ID: <20181030115717.GA2141@localhost.localdomain>
To: kernelnewbies@lists.kernelnewbies.org
List-Id: kernelnewbies.lists.kernelnewbies.org

Hello Peeps!

Few months ago I sent question below to clk mailing list. I got zero
replies so I took that as a hint that I am mistaken =) Hence I resend
same question to this list - perhaps this is a better place to search
for answer to (simple) question like this.

----- Forwarded message from Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com> -----

> Date: Fri, 7 Sep 2018 13:19:40 +0300
> From: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
> To: zyw at rock-chips.com, mturquette at baylibre.com, sboyd at kernel.org, w.egorov at phytec.de
> Cc: linux-clk at vger.kernel.org, linux-kernel at vger.kernel.org
> Subject: Does Rockchip RK808 driver unload work as intended?
> User-Agent: Mutt/1.9.2 (2017-12-15)
> 
> Hi dee Ho peeps,
> 
> I was browsing through the clk drivers as I tried to do some cleaning.
> Few days ago I submitted a patch which would add devm variants for
> clkdev lookup registration. I also added devm of_provider registration
> for cases where it is actually the parent device which contains clock
> definitions in DT. This seems to be quite typical for MFDs.
> 
> While doing this I hit to Rockchip RK808 driver which seems to utilize
> oarent device (MFD dev) for pretty much all devm releasing. I wonder if
> this is safe? What happens if one tries to remove the RK808 clk module?
> 
> I guess the clk deregistration and cleanups are not ran as parent device
> stays there, right? But is the clk module and clk module code still
> unload? So won't clk operation pointers registered to clk core become
> invalid?
> 
> I guess I don't have any HW to test this mnyself. And as the driver has
> been there since 2014 - well, chances are the driver does work and I
> just don't get it =)
> 
> So can someone please shed some light on this? Is this a bug or am I
> just plain wrong?
> 
> Br,
> 	Matti Vaittinen

----- End forwarded message -----

-- 
Matti Vaittinen
ROHM Semiconductors

~~~ "I don't think so," said Rene Descartes.  Just then, he vanished ~~~