Re: [PATCH] vio: make remove callback return void

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

On Wed, Jan 27, 2021 at 10:50:10PM +0100, Uwe Kleine-König wrote:
> The driver core ignores the return value of struct bus_type::remove()
> because there is only little that can be done. To simplify the quest to
> make this function return void, let struct vio_driver::remove() return
> void, too. All users already unconditionally return 0, this commit makes
> it obvious that returning an error code is a bad idea and makes it
> obvious for future driver authors that returning an error code isn't
> intended.
> 
> Note there are two nominally different implementations for a vio bus:
> one in arch/sparc/kernel/vio.c and the other in
> arch/powerpc/platforms/pseries/vio.c. I didn't care to check which
> driver is using which of these busses (or if even some of them can be
> used with both) and simply adapt all drivers and the two bus codes in
> one go.
> 
> Note that for the powerpc implementation there is a semantical change:
> Before this patch for a device that was bound to a driver without a
> remove callback vio_cmo_bus_remove(viodev) wasn't called. As the device
> core still considers the device unbound after vio_bus_remove() returns
> calling this unconditionally is the consistent behaviour which is
> implemented here.
> 
> Signed-off-by: Uwe Kleine-König <uwe@kleine-koenig.org>
> ---
> Hello,
> 
> note that this change depends on
> https://lore.kernel.org/r/20210121062005.53271-1-ljp@linux.ibm.com which removes
> an (ignored) return -EBUSY in drivers/net/ethernet/ibm/ibmvnic.c.
> I don't know when/if this latter patch will be applied, so it might take
> some time until my patch can go in.

Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>