1 files changed, 41 insertions, 63 deletions

diff --git a/drivers/firewire/core-device.c b/drivers/firewire/core-device.c
index 5db0518c66da..4b8523f00dce 100644
--- a/drivers/firewire/core-device.c
+++ b/drivers/firewire/core-device.c
@@ -33,6 +33,7 @@
 #include <linux/module.h>
 #include <linux/mutex.h>
 #include <linux/rwsem.h>
+#include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <linux/string.h>
 #include <linux/workqueue.h>
@@ -126,97 +127,74 @@ int fw_csr_string(const u32 *directory, int key, char *buf, size_t size)
 }
 EXPORT_SYMBOL(fw_csr_string);
 
-static bool is_fw_unit(struct device *dev);
-
-static int match_unit_directory(const u32 *directory, u32 match_flags,
-                                const struct ieee1394_device_id *id)
+static void get_ids(const u32 *directory, int *id)
 {
         struct fw_csr_iterator ci;
-        int key, value, match;
+        int key, value;
 
-        match = 0;
         fw_csr_iterator_init(&ci, directory);
         while (fw_csr_iterator_next(&ci, &key, &value)) {
-                if (key == CSR_VENDOR && value == id->vendor_id)
-                        match |= IEEE1394_MATCH_VENDOR_ID;
-                if (key == CSR_MODEL && value == id->model_id)
-                        match |= IEEE1394_MATCH_MODEL_ID;
-                if (key == CSR_SPECIFIER_ID && value == id->specifier_id)
-                        match |= IEEE1394_MATCH_SPECIFIER_ID;
-                if (key == CSR_VERSION && value == id->version)
-                        match |= IEEE1394_MATCH_VERSION;
+                switch (key) {
+                case CSR_VENDOR:        id[0] = value; break;
+                case CSR_MODEL:         id[1] = value; break;
+                case CSR_SPECIFIER_ID:  id[2] = value; break;
+                case CSR_VERSION:       id[3] = value; break;
+                }
         }
+}
+
+static void get_modalias_ids(struct fw_unit *unit, int *id)
+{
+        get_ids(&fw_parent_device(unit)->config_rom[5], id);
+        get_ids(unit->directory, id);
+}
+
+static bool match_ids(const struct ieee1394_device_id *id_table, int *id)
+{
+        int match = 0;
+
+        if (id[0] == id_table->vendor_id)
+                match |= IEEE1394_MATCH_VENDOR_ID;
+        if (id[1] == id_table->model_id)
+                match |= IEEE1394_MATCH_MODEL_ID;
+        if (id[2] == id_table->specifier_id)
+                match |= IEEE1394_MATCH_SPECIFIER_ID;
+        if (id[3] == id_table->version)
+                match |= IEEE1394_MATCH_VERSION;
 
-        return (match & match_flags) == match_flags;
+        return (match & id_table->match_flags) == id_table->match_flags;
 }
 
+static bool is_fw_unit(struct device *dev);
+
 static int fw_unit_match(struct device *dev, struct device_driver *drv)
 {
-        struct fw_unit *unit = fw_unit(dev);
-        struct fw_device *device;
-        const struct ieee1394_device_id *id;
+        const struct ieee1394_device_id *id_table =
+                        container_of(drv, struct fw_driver, driver)->id_table;
+        int id[] = {0, 0, 0, 0};
 
         /* We only allow binding to fw_units. */
         if (!is_fw_unit(dev))
                 return 0;
 
-        device = fw_parent_device(unit);
-        id = container_of(drv, struct fw_driver, driver)->id_table;
+        get_modalias_ids(fw_unit(dev), id);
 
-        for (; id->match_flags != 0; id++) {
-                if (match_unit_directory(unit->directory, id->match_flags, id))
+        for (; id_table->match_flags != 0; id_table++)
+                if (match_ids(id_table, id))
                         return 1;
 
-                /* Also check vendor ID in the root directory. */
-                if ((id->match_flags & IEEE1394_MATCH_VENDOR_ID) &&
-                    match_unit_directory(&device->config_rom[5],
-                                IEEE1394_MATCH_VENDOR_ID, id) &&
-                    match_unit_directory(unit->directory, id->match_flags
-                                & ~IEEE1394_MATCH_VENDOR_ID, id))
-                        return 1;
-        }
-
         return 0;
 }
 
 static int get_modalias(struct fw_unit *unit, char *buffer, size_t buffer_size)
 {
-        struct fw_device *device = fw_parent_device(unit);
-        struct fw_csr_iterator ci;
+        int id[] = {0, 0, 0, 0};
 
-        int key, value;
-        int vendor = 0;
-        int model = 0;
-        int specifier_id = 0;
-        int version = 0;
-
-        fw_csr_iterator_init(&ci, &device->config_rom[5]);
-        while (fw_csr_iterator_next(&ci, &key, &value)) {
-                switch (key) {
-                case CSR_VENDOR:
-                        vendor = value;
-                        break;
-                case CSR_MODEL:
-                        model = value;
-                        break;
-                }
-        }
-
-        fw_csr_iterator_init(&ci, unit->directory);
-        while (fw_csr_iterator_next(&ci, &key, &value)) {
-                switch (key) {
-                case CSR_SPECIFIER_ID:
-                        specifier_id = value;
-                        break;
-                case CSR_VERSION:
-                        version = value;
-                        break;
-                }
-        }
+        get_modalias_ids(unit, id);
 
         return snprintf(buffer, buffer_size,
                         "ieee1394:ven%08Xmo%08Xsp%08Xver%08X",
-                        vendor, model, specifier_id, version);
+                        id[0], id[1], id[2], id[3]);
 }
 
 static int fw_unit_uevent(struct device *dev, struct kobj_uevent_env *env)