Re: [PATCH 01/20] mtd: rawnand: txx9ndfmc: Mark driver struct with __refdata to prevent section mismatch warning

["Arnd Bergmann" <arnd@arndb.de>]

On Mon, Oct 9, 2023, at 14:46, Miquel Raynal wrote:
>> On Mon, Oct 09, 2023 at 10:43:46AM +0200, Arnd Bergmann wrote:
>> > On Mon, Oct 9, 2023, at 09:22, Masahiro Yamada wrote:  
>> > > On Mon, Oct 9, 2023 at 5:02 AM Uwe Kleine-König <u.kleine-koenig@pengutronix.de> > Can we instead question the use of module_platform_driver_probe()?
> I don't have the history in mind, but why not just switch to regular
> module_platform_driver() registration instead? It seems like the
> original authors just did not care about the remove path and were
> happy to skip its implementation.
>
> On mtd devices one can argue that the flash underlying stores the
> rootfs and thus cannot be removed, but I believe today this is a
> questionable (software) design.

It was changed to module_platform_driver_probe() in commit
3a2a13fa902d2 ("mtd: txx9ndfmc: use module_platform_driver_probe()")
with a short changelog text:

commit 3a2a13fa902d232a1e56582647aed6cb2591349b
Author: Jingoo Han <jg1.han@samsung.com>
Date:   Tue Mar 5 13:31:24 2013 +0900

    mtd: txx9ndfmc: use module_platform_driver_probe()
    
    This patch uses module_platform_driver_probe() macro which makes
    the code smaller and simpler.
    
    Signed-off-by: Jingoo Han <jg1.han@samsung.com>
    Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
    Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

Instead of just simplifying the code, I think that was actually
a bugfix because it prevented both the probe and remove callbacks
from getting called after getting dropped (deferred probe or
unbind/rebind). Using module_platform_driver() is probably
even better here, but then we need to remove both the __init
and __exit annotations.

      Arnd