Re: [PATCH v2 2/4] ARM: amba: Fix race condition with driver_override

[Greg Kroah-Hartman]

On Wed, Apr 25, 2018 at 07:53:06PM +0200, Geert Uytterhoeven wrote:
> Hi Greg,
> 
> On Wed, Apr 25, 2018 at 6:06 PM, Greg Kroah-Hartman
> <gregkh@xxxxxxxxxxxxxxxxxxx> wrote:
> > On Tue, Apr 10, 2018 at 03:21:44PM +0200, Geert Uytterhoeven wrote:
> >> The driver_override implementation is susceptible to a race condition
> >> when different threads are reading vs storing a different driver
> >> override.  Add locking to avoid this race condition.
> >>
> >> Cfr. commits 6265539776a0810b ("driver core: platform: fix race
> >> condition with driver_override") and 9561475db680f714 ("PCI: Fix race
> >> condition with driver_override").
> >>
> >> Fixes: 3cf385713460eb2b ("ARM: 8256/1: driver coamba: add device binding path 'driver_override'")
> >> Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
> >> Reviewed-by: Todd Kjos <tkjos@xxxxxxxxxx>
> >> Cc: stable <stable@xxxxxxxxxxxxxxx>
> 
> > As this should go to stable kernels, I've fixed it up to apply without
> > patch 1 as that's not a real "fix" that anyone needs...
> >
> > Please try to remember to put fixes first, and then "trivial" things
> > later on in a series.
> 
> I did it on purpose, as the fix is much more ugly without patch 1 applied.
> Can't you just take patch 1, too? More consistency is always nice, even for
> stable ;-)

Consistency is nice, but when you have bug fixes that rely on "trivial"
patches, it's usually not nice :(

I already committed patch 2 to my tree without 1, so let's leave it
as-is for now.

thanks,

greg k-h