linux-kernel - Re: [PATCH RESEND v2 0/2] driver core: bus: Fix issues related to bus_rescan_devices

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Message-ID: <2024111228-snowcap-counting-b833@gregkh>
Date: Tue, 12 Nov 2024 12:48:11 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Zijun Hu <zijun_hu@...oud.com>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>, linux-kernel@...r.kernel.org,
	Zijun Hu <quic_zijuhu@...cinc.com>
Subject: Re: [PATCH RESEND v2 0/2] driver core: bus: Fix issues related to
 bus_rescan_devices_helper()

On Tue, Oct 22, 2024 at 07:18:00PM +0800, Zijun Hu wrote:
> This patch series is to fix issues related to bus_rescan_devices_helper().
> 
> The function is improperly used for 2 incompatible scenarios as
> explained below:
> 
> Scenario A: scan drivers for a single device user specify
>  - user may care about precise synchronous scanning result, so the
>    function can not collapse error codes.

I do not understand this, what is wrong that this is fixing?

> Scenario B: scan drivers for all devices of a bus
>  - user may need to scan drivers for a bus's devices as many as
>    possible, so the function needs to ignore inconsequential error
>    codes for a device in order to continue to scan for next device.

How often is that needed?  And why can't that still work with the
existing code?

thanks,

greg k-h