linux-kernel - Re: [PATCH] usb: dwc3: gadget: Move vbus draw to workqueue context

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Message-ID: <e94b8434-09ff-4ea0-a762-0869345aab4e@oss.qualcomm.com>
Date: Wed, 4 Feb 2026 09:47:16 +0530
From: Prashanth K <prashanth.k@....qualcomm.com>
To: Kyle Tso <kyletso@...gle.com>
Cc: Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH] usb: dwc3: gadget: Move vbus draw to workqueue context



On 2/4/2026 9:29 AM, Kyle Tso wrote:
> On Thu, Jan 29, 2026 at 7:16 PM Prashanth K
> <prashanth.k@....qualcomm.com> wrote:
>>
>> Currently dwc3_gadget_vbus_draw() can be called from atomic
>> context, which in turn invokes power-supply-core APIs. And
>> some these PMIC APIs have operations that may sleep, leading
>> to kernel panic.
>>
>> Fix this by moving the vbus_draw into a workqueue context.
>>
>> Fixes: 66e0ea341a2a ("usb: dwc3: core: Defer the probe until USB power supply ready")
> 
> I think the following patch is the one to fix:
> 
> https://lore.kernel.org/all/20210222115149.3606776-3-raychi@google.com/
> 

Yes agreed, i added 66e0ea341a2a because it can be backported without
conflicts only till 66e0ea341a2a, but I'll change it to the correct one.

Thanks for confirming,
Prashanth K