linux-kernel - Re: [PATCH] nvdimm: nvdimm_bus_register: Avoid adding device to the unregistered bus

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Date:   Tue, 21 Mar 2023 03:19:27 +0000
From:   "lizhijian@...itsu.com" <lizhijian@...itsu.com>
To:     Dan Williams <dan.j.williams@...el.com>,
        "vishal.l.verma@...el.com" <vishal.l.verma@...el.com>,
        "dave.jiang@...el.com" <dave.jiang@...el.com>,
        "ira.weiny@...el.com" <ira.weiny@...el.com>,
        "nvdimm@...ts.linux.dev" <nvdimm@...ts.linux.dev>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] nvdimm: nvdimm_bus_register: Avoid adding device to the
 unregistered bus



On 21/03/2023 10:38, Dan Williams wrote:
> lizhijian@...itsu.com wrote:
> [..]
>>> Now I do think it would be a good idea to fail device_add() if the bus
>>> is not registered,
>>
>> BTW, below line 369: device_add() didn't fail in practical.
>>
> 
> I think that's ok because the device gets added, but never probed due to
> this part of that commit I referenced:

Very thanks for your explanation.

> 
> @@ -503,20 +517,21 @@ int bus_add_device(struct device *dev)
>    */
>   void bus_probe_device(struct device *dev)
>   {
> -       struct bus_type *bus = dev->bus;
> +       struct subsys_private *sp = bus_to_subsys(dev->bus);
>          struct subsys_interface *sif;
>   
> -       if (!bus)
> +       if (!sp)
>                  return;
>   
> 
> ...so it does what you want which is disable the libnvdimm subsystem
> from binding to any devices without crashing.

Yes, it's fine enough to me.