linux-kernel - Re: [RFC v1] hack: suspend: usb: option: add reset

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Date:   Wed, 30 Nov 2022 15:04:28 +0100
From:   Oliver Neukum <oneukum@...e.com>
To:     Martin Kepplinger <martin.kepplinger@...i.sm>, johan@...nel.org,
        gregkh@...uxfoundation.org
Cc:     linux-usb@...r.kernel.org, phone-devel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC v1] hack: suspend: usb: option: add reset_resume callback



On 30.11.22 13:15, Martin Kepplinger wrote:
> Currently to be the same as resume(). This will just avoid re-enumeration
> of the modem device on every system resume.
> 
> This exists only because the usb core will re-enumerate *any* device
> whos' driver doesn't have reset_resume() implemented. A call trace:

Hi,

this is deeply problematic. Strictly speaking it introduces a bug.
By implementing reset_resume() you are telling the rest of the system
that all settings have survived the hibernation. That is likely wrong in
your case.

	Regards
		Oliver