linux-kernel - Re: [PATCH v2 1/4] nubus: Simplify check in remove callback

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Message-ID: <dd248ad3-87b-ead8-957d-aea36cb01058@linux-m68k.org>
Date:   Sun, 1 Aug 2021 15:04:03 +1000 (AEST)
From:   Finn Thain <fthain@...ux-m68k.org>
To:     Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, kernel@...gutronix.de,
        linux-m68k@...ts.linux-m68k.org
Subject: Re: [PATCH v2 1/4] nubus: Simplify check in remove callback

On Fri, 30 Jul 2021, Uwe Kleine-König wrote:

> The driver core only calls a remove callback when the device was
> successfully bound (aka probed) before. So dev->driver is never NULL and
> the respective check can just be dropped.
> 
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>

Acked-by: Finn Thain <fthain@...ux-m68k.org>

BTW, aside from nubus, zorro and superhyway you can find the same pattern
in many other busses. You may want to patch the following methods too.

acpi_device_remove
apr_device_remove
ccwgroup_remove
gio_device_remove
hid_device_remove 
ibmebus_bus_device_remove
macio_device_remove
memstick_device_remove
ntb_remove
pci_device_remove
pnp_device_remove
ps3_system_bus_remove
rio_device_remove
slim_device_remove
soundbus_device_remove
ssb_device_remove
tifm_device_remove
vdpa_dev_remove
vmbus_remove

> ---
>  drivers/nubus/bus.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/nubus/bus.c b/drivers/nubus/bus.c
> index d9d04f27f89b..17fad660032c 100644
> --- a/drivers/nubus/bus.c
> +++ b/drivers/nubus/bus.c
> @@ -33,7 +33,7 @@ static void nubus_device_remove(struct device *dev)
>  {
>  	struct nubus_driver *ndrv = to_nubus_driver(dev->driver);
>  
> -	if (dev->driver && ndrv->remove)
> +	if (ndrv->remove)
>  		ndrv->remove(to_nubus_board(dev));
>  }
>  
>