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Message-ID: <20240816223127.sig244r3sx2gwgqk@synopsys.com>
Date: Fri, 16 Aug 2024 22:31:32 +0000
From: Thinh Nguyen <Thinh.Nguyen@...opsys.com>
To: Selvarasu Ganesan <selvarasu.g@...sung.com>
CC: Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"jh0801.jung@...sung.com" <jh0801.jung@...sung.com>,
"dh10.jung@...sung.com" <dh10.jung@...sung.com>,
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"stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH v3] usb: dwc3: core: Prevent USB core invalid event buffer
address access
On Thu, Aug 15, 2024, Selvarasu Ganesan wrote:
> This commit addresses an issue where the USB core could access an
> invalid event buffer address during runtime suspend, potentially causing
> SMMU faults and other memory issues in Exynos platforms. The problem
> arises from the following sequence.
> 1. In dwc3_gadget_suspend, there is a chance of a timeout when
> moving the USB core to the halt state after clearing the
> run/stop bit by software.
> 2. In dwc3_core_exit, the event buffer is cleared regardless of
> the USB core's status, which may lead to an SMMU faults and
> other memory issues. if the USB core tries to access the event
> buffer address.
>
> To prevent this hardware quirk on Exynos platforms, this commit ensures
> that the event buffer address is not cleared by software when the USB
> core is active during runtime suspend by checking its status before
> clearing the buffer address.
>
> Cc: stable@...r.kernel.org # v6.1+
Usually there's no "v" to indicate version. I'm not sure if it'll be an
issue. Regardless,
Acked-by: Thinh Nguyen <Thinh.Nguyen@...opsys.com>
Thanks,
Thinh
> Signed-off-by: Selvarasu Ganesan <selvarasu.g@...sung.com>
> ---
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