[PATCH v2] usb: xhci: add xhci_halt() for HCE Handling

[PATCH v2] usb: xhci: add xhci_halt() for HCE Handling

[Dayu Jiang]

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 xHCI controller reports HCE in the interrupt handler, the driver
currently only logs a warning and continues execution. However, HCE
indicates a critical hardware failure that requires the controller to be
halted. This ensures the controller is in a consistent state and prevents
further operations on failed hardware.

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.

Fixes: 2a25e66d676df ("xhci: print warning when HCE was set")
Signed-off-by: Dayu Jiang <jiangdayu@xiaomi.com>
---
 drivers/usb/host/xhci-ring.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index 9315ba18310d..1cbefee3c4ca 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -3195,6 +3195,7 @@ irqreturn_t xhci_irq(struct usb_hcd *hcd)
 
 	if (status & STS_HCE) {
 		xhci_warn(xhci, "WARNING: Host Controller Error\n");
+		xhci_halt(xhci);
 		goto out;
 	}
 
-- 
2.34.1