linux-kernel - Re: [PATCH v1] usb: dwc3: re-enable runtime PM after failed resume

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20240913181251.3upf6zme2j2mobv3@synopsys.com>
Date: Fri, 13 Sep 2024 18:12:52 +0000
From: Thinh Nguyen <Thinh.Nguyen@...opsys.com>
To: Roy Luo <royluo@...gle.com>
CC: Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "badhri@...gle.com" <badhri@...gle.com>,
        "frank.wang@...k-chips.com" <frank.wang@...k-chips.com>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH v1] usb: dwc3: re-enable runtime PM after failed resume

On Fri, Sep 13, 2024, Roy Luo wrote:
> On Fri, Sep 6, 2024 at 5:58 PM Thinh Nguyen <Thinh.Nguyen@...opsys.com> wrote:
> >
> > On Fri, Sep 06, 2024, Roy Luo wrote:
> > > When dwc3_resume_common() returns an error, runtime pm is left in
> > > disabled state in dwc3_resume(). The next dwc3_suspend_common()
> >
> > What issue did you see when dwc3_suspend_common is not skipped?
> 
> Apologies for the delayed response.
> 
> To answer your question, if dwc3_suspend_common() isn't skipped, it
> can lead to issues because dwc->dev is already in a suspended state.
> This could mean its parent devices (like the power domain or glue
> driver) are also suspended and may have released resources that dwc
> requires.
> Consequently, calling dwc3_suspend_common() in this situation could
> result in attempts to access unclocked or unpowered registers.
> 

Can you include this info in the commit message?

And while at it, can you also update minor style change to remove the
brackets for single line if statement to this:

 	ret = dwc3_resume_common(dwc, PMSG_RESUME);
 	if (ret)
 		pm_runtime_set_suspended(dev);

Thanks,
Thinh