From: Nicolin Chen <redacted>
Sent: Wednesday, March 18, 2026 3:16 AM

@@ -977,7 +978,15 @@ int pci_dev_acpi_reset(struct pci_dev *dev, bool

probe)
 		ret = -ENOTTY;
 	}

-	pci_dev_reset_iommu_done(dev);
+	/*
+	 * The reset might be invoked to recover a serious error. E.g. when
the
+	 * ATC failed to invalidate its stale entries, which can result in data
+	 * corruption. Thus, do not unblock ATS until a successful reset.
+	 */
+	if (!ret || !pci_ats_supported(dev))
+		pci_dev_reset_iommu_done(dev);
+	else
+		pci_warn(dev, "Reset failed. Blocking ATS to protect
memory\n");
 	return ret;