1 files changed, 80 insertions, 0 deletions

diff --git a/stubs.h b/stubs.h
new file mode 100644
index 0000000..bfcc0d7
--- /dev/null
+++ b/stubs.h
@@ -0,0 +1,80 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Helpful private functions copied from elsewhere in the kernel tree
+ * DO NOT MODIFY
+ */
+#include <linux/version.h>
+
+// Functions from drivers/pci/pci.h
+/**
+ * pci_match_one_device - Tell if a PCI device structure has a matching
+ *                        PCI device id structure
+ * @id: single PCI device id structure to match
+ * @dev: the PCI device structure to match against
+ *
+ * Returns the matching pci_device_id structure or %NULL if there is no match.
+ */
+static inline const struct pci_device_id *
+pci_match_one_device(const struct pci_device_id *id, const struct pci_dev *dev)
+{
+        if ((id->vendor == PCI_ANY_ID || id->vendor == dev->vendor) &&
+            (id->device == PCI_ANY_ID || id->device == dev->device) &&
+            (id->subvendor == PCI_ANY_ID || id->subvendor == dev->subsystem_vendor) &&
+            (id->subdevice == PCI_ANY_ID || id->subdevice == dev->subsystem_device) &&
+            !((id->class ^ dev->class) & id->class_mask))
+                return id;
+        return NULL;
+}
+
+// Functions from drivers/pci/search.h
+#include <linux/device.h>
+#include <linux/pci.h>
+extern struct bus_type pci_bus_type;
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(5,3,0)
+static int match_pci_dev_by_id(struct device *dev, void *data)
+#else
+static int match_pci_dev_by_id(struct device *dev, const void *data)
+#endif
+{
+        struct pci_dev *pdev = to_pci_dev(dev);
+        const struct pci_device_id *id = data;
+
+        if (pci_match_one_device(id, pdev))
+                return 1;
+        return 0;
+}
+
+/*
+ * pci_get_dev_by_id - begin or continue searching for a PCI device by id
+ * @id: pointer to struct pci_device_id to match for the device
+ * @from: Previous PCI device found in search, or %NULL for new search.
+ *
+ * Iterates through the list of known PCI devices.  If a PCI device is found
+ * with a matching id a pointer to its device structure is returned, and the
+ * reference count to the device is incremented.  Otherwise, %NULL is returned.
+ * A new search is initiated by passing %NULL as the @from argument.  Otherwise
+ * if @from is not %NULL, searches continue from next device on the global
+ * list.  The reference count for @from is always decremented if it is not
+ * %NULL.
+ *
+ * This is an internal function for use by the other search functions in
+ * this file.
+ */
+static struct pci_dev *pci_get_dev_by_id(const struct pci_device_id *id,
+                                         struct pci_dev *from)
+{
+        struct device *dev;
+        struct device *dev_start = NULL;
+        struct pci_dev *pdev = NULL;
+
+        if (from)
+                dev_start = &from->dev;
+        dev = bus_find_device(&pci_bus_type, dev_start, (void *)id,
+                              match_pci_dev_by_id);
+        if (dev)
+                pdev = to_pci_dev(dev);
+        pci_dev_put(from);
+        return pdev;
+}
+