From 5ae73518cb39dd81e641dfa7ce20751c853579e0 Mon Sep 17 00:00:00 2001 From: Stefan Richter Date: Fri, 19 Mar 2010 00:38:29 +0100 Subject: [PATCH] firewire: core: fix Model_ID in modalias MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit The modalias string of devices that represent units on a FireWire node did not show Module_ID entries within unit directories. This was because firewire-core searched only the root directory of the configuration ROM for a Model_ID entry. We now search first the root directory, then the unit directory. IOW honor a unit directory's Model_ID if present, otherwise fall back to the root directory's model ID (if present). Furthermore, apply the same change to Vendor_ID. This had the same issue but it was less apparent because most devices provide Vendor_ID only in the root directory. And finally, also use this strategy for the remaining two IDs in the modalias, Specifier_ID and Version. It does not actually make sense to look for them elsewhere than in the unit directory because they are mandatory there. However, a uniform search order simplifies the implementation and has no adverse affect in practice. Side notes: - The older counterpart of this, nodemgr.c of ieee1394, looked for Vendor_ID first in the root directory, then in the unit directory, and for Model_ID only in the unit directory. - There is a single mainline driver which requires Vendor_ID and Model_ID --- the firedtv driver. This one worked because FireDTVs provide Vendor_ID in the root directory and Model_ID identically in root directory and unit directory. - Apart from firedtv, there are currently no drivers known to me (including userspace drivers) that look at the Vendor_ID or Model_ID of the modalias. Reported-by: Maciej Żenczykowski Signed-off-by: Stefan Richter --- drivers/firewire/core-device.c | 40 ++++++++++++---------------------- 1 file changed, 14 insertions(+), 26 deletions(-) diff --git a/drivers/firewire/core-device.c b/drivers/firewire/core-device.c index 014cabd3afda..c91d7179eb96 100644 --- a/drivers/firewire/core-device.c +++ b/drivers/firewire/core-device.c @@ -180,44 +180,32 @@ static int fw_unit_match(struct device *dev, struct device_driver *drv) return 0; } -static int get_modalias(struct fw_unit *unit, char *buffer, size_t buffer_size) +static void get_modalias_ids(const u32 *directory, int *id) { - struct fw_device *device = fw_parent_device(unit); struct fw_csr_iterator ci; - 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]); + fw_csr_iterator_init(&ci, directory); while (fw_csr_iterator_next(&ci, &key, &value)) { switch (key) { - case CSR_VENDOR: - vendor = value; - break; - case CSR_MODEL: - model = value; - break; + 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; } } +} - 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; - } - } +static int get_modalias(struct fw_unit *unit, char *buffer, size_t buffer_size) +{ + int id[] = {0, 0, 0, 0}; + + get_modalias_ids(&fw_parent_device(unit)->config_rom[5], id); + get_modalias_ids(unit->directory, 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) -- 2.20.1