[PATCH master] base: driver: fix double removal of child devices

[Jules Maselbas]

Hi Ahmad,

On Mon, Sep 13, 2021 at 10:29:42AM +0200, Ahmad Fatoum wrote:
> Child devices like an ext4 file system on a partition may be removed
> twice: Once because they're in the active devices list and then once
> more, because unregister_device is called for the children of its parent.
> 
> As struct bus_type::remove clears association of a driver with its
> device, we can set struct device_d::driver to NULL. unregister_device
> will then skip the second dev->bus->remove.
> 
> Fixes: 29f1c211d86c ("fs: don't free device in remove callback")
> Signed-off-by: Ahmad Fatoum <ahmad at a3f.at>
> ---
>  drivers/base/driver.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/base/driver.c b/drivers/base/driver.c
> index 0e04ef36868d..0fedb30161b4 100644
> --- a/drivers/base/driver.c
> +++ b/drivers/base/driver.c
> @@ -512,7 +512,10 @@ static void devices_shutdown(void)
>  
>  	list_for_each_entry(dev, &active, active) {
>  		if (dev->bus->remove)
> +		if (dev->bus->remove) {
I think there is a typo here, this line is duplicated.

>  			dev->bus->remove(dev);
> +			dev->driver = NULL;
> +		}
>  	}
>  }
>  devshutdown_exitcall(devices_shutdown);
> -- 
> 2.33.0
> 
> 
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