linux-kernel - Re: [PATCH] usb: dwc3: qcom: Add shutdown handler

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: <2025072542-bleep-parting-3e7a@gregkh>
Date: Fri, 25 Jul 2025 10:48:00 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Prashanth K <prashanth.k@....qualcomm.com>
Cc: Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
	Bjorn Andersson <bjorn.andersson@....qualcomm.com>,
	Krishna Kurapati <krishna.kurapati@....qualcomm.com>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: dwc3: qcom: Add shutdown handler

On Fri, Jul 25, 2025 at 11:51:58AM +0530, Prashanth K wrote:
> Currently during system reboot, SMMU disables its translations
> while devices like USB may still be actively using DMA buffers.
> This can lead to NOC errors and system crashes due to invalid
> memory access.
> 
> Address this by adding a shutdown callback to dwc3-qcom, which
> ensures proper teardown of UDC stack and prevents DWC3 controller
> from accessing memory after SMMU translation is disabled. Reuse
> the existing remove callback for this purpose.
> 
> Signed-off-by: Prashanth K <prashanth.k@....qualcomm.com>
> ---
>  drivers/usb/dwc3/dwc3-qcom.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)

What commit id does this fix?  Or is this just a new feature?

thanks,

greg k-h