Re: [PATCH] usb: xhci: add xhci_halt() for HCE Handling

[Mathias Nyman]

On 2/26/26 11:27, Dayu Jiang wrote:
> Hi Greg,
>
> I have updated the changelog text as requested and resubmitted the patch.
> https://lore.kernel.org/linux-usb/20260128100746.561626-1-jiangdayu@xxxxxxxxxx/
> Please kindly review it and let me know if it is acceptable now.

I'll send it forward, but changed the commit message.
Does this modified version still describe the case accurately:

usb: xhci: Prevent interrupt storm on host controller error (HCE)

The xHCI controller reports a Host Controller Error (HCE) in UAS Storage
Device plug/unplug scenarios on Android devices, which is checked in
xhci_irq() function and causes an interrupt storm (since the interrupt
isn’t cleared), leading to severe system-level faults.

When the xHC controller reports HCE in the interrupt handler, the driver
only logs a warning and assumes xHC activity will stop. The interrupt storm
does however continue until driver manually disables xHC interrupt and
stops the controller by calling xhci_halt().

The change is made in xhci_irq() function where STS_HCE status is
checked, mirroring the existing error handling pattern used for
STS_FATAL errors.

This only fixes the interrupt storm. Proper HCE recovery requires resetting
and re-initializing the xHC.

Thanks
Mathias