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firewire: core: improve reread_config_rom() interface

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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 <clemens@ladisch.de>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This commit is contained in:
Clemens Ladisch 2012-04-11 17:37:36 +02:00 • committed by Stefan Richter
parent d33ec3b55e
commit db7494e2ce
1 changed files with 19 additions and 21 deletions
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40
drivers/firewire/core-device.c
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@ -1069,31 +1069,30 @@ static void fw_device_init(struct work_struct *work)
put_device(&device->device); /* our reference */ 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 */ /* 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; u32 q;
int i; int i, rcode;
for (i = 0; i < 6; i++) { for (i = 0; i < 6; i++) {
if (read_rom(device, generation, i, &q) != RCODE_COMPLETE) rcode = read_rom(device, generation, i, &q);
return REREAD_BIB_ERROR; if (rcode != RCODE_COMPLETE)
return rcode;
if (i == 0 && q == 0) if (i == 0 && q == 0)
/* inaccessible (see read_config_rom); retry later */ /* inaccessible (see read_config_rom); retry later */
return REREAD_BIB_ERROR; return RCODE_BUSY;
if (q != device->config_rom[i]) if (q != device->config_rom[i]) {
return REREAD_BIB_CHANGED; *changed = true;
return RCODE_COMPLETE;
}
} }
return REREAD_BIB_UNCHANGED; *changed = false;
return RCODE_COMPLETE;
} }
static void fw_device_refresh(struct work_struct *work) static void fw_device_refresh(struct work_struct *work)
@ -1101,10 +1100,11 @@ static void fw_device_refresh(struct work_struct *work)
struct fw_device *device = struct fw_device *device =
container_of(work, struct fw_device, work.work); container_of(work, struct fw_device, work.work);
struct fw_card *card = device->card; 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)) { ret = reread_config_rom(device, device->generation, &changed);
case REREAD_BIB_ERROR: if (ret != RCODE_COMPLETE) {
if (device->config_rom_retries < MAX_RETRIES / 2 && if (device->config_rom_retries < MAX_RETRIES / 2 &&
atomic_read(&device->state) == FW_DEVICE_INITIALIZING) { atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
device->config_rom_retries++; device->config_rom_retries++;
@ -1113,8 +1113,9 @@ static void fw_device_refresh(struct work_struct *work)
return; return;
} }
goto give_up; goto give_up;
}
case REREAD_BIB_UNCHANGED: if (!changed) {
if (atomic_cmpxchg(&device->state, if (atomic_cmpxchg(&device->state,
FW_DEVICE_INITIALIZING, FW_DEVICE_INITIALIZING,
FW_DEVICE_RUNNING) == FW_DEVICE_GONE) FW_DEVICE_RUNNING) == FW_DEVICE_GONE)
@ -1123,9 +1124,6 @@ static void fw_device_refresh(struct work_struct *work)
fw_device_update(work); fw_device_update(work);
device->config_rom_retries = 0; device->config_rom_retries = 0;
goto out; goto out;
case REREAD_BIB_CHANGED:
break;
} }
/* /*