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-rw-r--r--drivers/firewire/core-device.c31
-rw-r--r--drivers/firewire/device-attribute-test.c5
2 files changed, 27 insertions, 9 deletions
diff --git a/drivers/firewire/core-device.c b/drivers/firewire/core-device.c
index 2c8771305aca..fd4c025a3f70 100644
--- a/drivers/firewire/core-device.c
+++ b/drivers/firewire/core-device.c
@@ -317,17 +317,29 @@ static ssize_t show_text_leaf(struct device *dev,
{
struct config_rom_attribute *attr =
container_of(dattr, struct config_rom_attribute, attr);
- const u32 *dir;
+ const u32 *directories[] = {NULL, NULL};
size_t bufsize;
char dummy_buf[2];
- int ret;
+ int i, ret = -ENOENT;
down_read(&fw_device_rwsem);
- if (is_fw_unit(dev))
- dir = fw_unit(dev)->directory;
- else
- dir = fw_device(dev)->config_rom + ROOT_DIR_OFFSET;
+ if (is_fw_unit(dev)) {
+ directories[0] = fw_unit(dev)->directory;
+ } else {
+ const u32 *root_directory = fw_device(dev)->config_rom + ROOT_DIR_OFFSET;
+ const u32 *vendor_directory = search_directory(root_directory, CSR_VENDOR);
+
+ if (!vendor_directory) {
+ directories[0] = root_directory;
+ } else {
+ // Legacy layout of configuration ROM described in Annex 1 of
+ // 'Configuration ROM for AV/C Devices 1.0 (December 12, 2000, 1394
+ // Trading Association, TA Document 1999027)'.
+ directories[0] = root_directory;
+ directories[1] = vendor_directory;
+ }
+ }
if (buf) {
bufsize = PAGE_SIZE - 1;
@@ -336,7 +348,12 @@ static ssize_t show_text_leaf(struct device *dev,
bufsize = 1;
}
- ret = fw_csr_string(dir, attr->key, buf, bufsize);
+ for (i = 0; i < ARRAY_SIZE(directories) && !!directories[i]; ++i) {
+ int result = fw_csr_string(directories[i], attr->key, buf, bufsize);
+ // Detected.
+ if (result >= 0)
+ ret = result;
+ }
if (ret >= 0) {
/* Strip trailing whitespace and add newline. */
diff --git a/drivers/firewire/device-attribute-test.c b/drivers/firewire/device-attribute-test.c
index 689115433425..da2a4a09bf84 100644
--- a/drivers/firewire/device-attribute-test.c
+++ b/drivers/firewire/device-attribute-test.c
@@ -206,8 +206,9 @@ static void device_attr_legacy_avc(struct kunit *test)
// Descriptor leaf entry for vendor is not found.
KUNIT_EXPECT_LT(test, show_text_leaf(node_dev, &config_rom_attributes[5].attr, buf), 0);
- // Descriptor leaf entry for model is not found.
- KUNIT_EXPECT_LT(test, show_text_leaf(node_dev, &config_rom_attributes[6].attr, buf), 0);
+ // Descriptor leaf entry for model is found.
+ KUNIT_EXPECT_GT(test, show_text_leaf(node_dev, &config_rom_attributes[6].attr, buf), 0);
+ KUNIT_EXPECT_STREQ(test, buf, "ABCDEFGHIJ\n");
// For entries in unit 0 directory.