On Sat, Dec 12, 2020 at 04:14:26AM +0300, Dmitry Baryshkov wrote:
> Platform code stopped checking if the device is bound to the actual
> platform driver, thus calling non-existing drv->shutdown(). Verify that
> _dev->driver is not NULL before calling remove/shutdown callbacks.
>
> Signed-off-by: Dmitry Baryshkov <dmitry.barysh...@linaro.org>
> Fixes: 9c30921fe799 ("driver core: platform: use bus_type functions")
> ---
> drivers/base/platform.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/base/platform.c b/drivers/base/platform.c
> index 0358dc3ea3ad..93f44e69b472 100644
> --- a/drivers/base/platform.c
> +++ b/drivers/base/platform.c
> @@ -1342,7 +1342,7 @@ static int platform_remove(struct device *_dev)
> struct platform_device *dev = to_platform_device(_dev);
> int ret = 0;
>
> - if (drv->remove)
> + if (_dev->driver && drv->remove)
> ret = drv->remove(dev);
> dev_pm_domain_detach(_dev, true);
I don't object to this, but it always feels odd to be doing pointer math
on a NULL value, wait until the static-checkers get ahold of this and
you get crazy emails saying you are crashing the kernel (hint, they are
broken).
But, I don't see why this check is needed? If a driver is not bound to
a device, shouldn't this whole function just not be called? Or error
out at the top?
Uwe, I'd really like your review/ack of this before taking it.
thanks,
greg k-h
