Date: Wed, 11 Apr 2012 17:37:36 +0200 From: Clemens Ladisch Subject: firewire: core: improve reread_config_rom() interface The return value of reread_config_rom() was a mixture of two pieces of information: whether the function succeeded, and whether the config rom had changed. To clarify the semantics, and to allow returning the actual error code, split the second information into a new output parameter. Signed-off-by: Clemens Ladisch Signed-off-by: Stefan Richter --- drivers/firewire/core-device.c | 40 ++++++++++++++++----------------- 1 file changed, 19 insertions(+), 21 deletions(-) --- a/drivers/firewire/core-device.c +++ b/drivers/firewire/core-device.c @@ -1070,31 +1070,30 @@ static void fw_device_init(struct work_s put_device(&device->device); /* our reference */ } -enum { - REREAD_BIB_ERROR, - REREAD_BIB_UNCHANGED, - REREAD_BIB_CHANGED, -}; - /* Reread and compare bus info block and header of root directory */ -static int reread_config_rom(struct fw_device *device, int generation) +static int reread_config_rom(struct fw_device *device, int generation, + bool *changed) { u32 q; - int i; + int i, rcode; for (i = 0; i < 6; i++) { - if (read_rom(device, generation, i, &q) != RCODE_COMPLETE) - return REREAD_BIB_ERROR; + rcode = read_rom(device, generation, i, &q); + if (rcode != RCODE_COMPLETE) + return rcode; if (i == 0 && q == 0) /* inaccessible (see read_config_rom); retry later */ - return REREAD_BIB_ERROR; + return RCODE_BUSY; - if (q != device->config_rom[i]) - return REREAD_BIB_CHANGED; + if (q != device->config_rom[i]) { + *changed = true; + return RCODE_COMPLETE; + } } - return REREAD_BIB_UNCHANGED; + *changed = false; + return RCODE_COMPLETE; } static void fw_device_refresh(struct work_struct *work) @@ -1102,10 +1101,11 @@ static void fw_device_refresh(struct wor struct fw_device *device = container_of(work, struct fw_device, work.work); struct fw_card *card = device->card; - int node_id = device->node_id; + int ret, node_id = device->node_id; + bool changed; - switch (reread_config_rom(device, device->generation)) { - case REREAD_BIB_ERROR: + ret = reread_config_rom(device, device->generation, &changed); + if (ret != RCODE_COMPLETE) { if (device->config_rom_retries < MAX_RETRIES / 2 && atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { device->config_rom_retries++; @@ -1114,8 +1114,9 @@ static void fw_device_refresh(struct wor return; } goto give_up; + } - case REREAD_BIB_UNCHANGED: + if (!changed) { if (atomic_cmpxchg(&device->state, FW_DEVICE_INITIALIZING, FW_DEVICE_RUNNING) == FW_DEVICE_GONE) @@ -1124,9 +1125,6 @@ static void fw_device_refresh(struct wor fw_device_update(work); device->config_rom_retries = 0; goto out; - - case REREAD_BIB_CHANGED: - break; } /*