/**
* pdcspath_store - This function writes a path to stable storage.
* @entry: A pointer to an allocated pdcspath_entry.
*
* It can be used in two ways: either by passing it a preset devpath struct
* containing an already computed hardware path, or by passing it a device
* pointer, from which it'll find out the corresponding hardware path.
* For now we do not handle the case where there's an error in writing to the
* Stable Storage area, so you'd better not mess up the data :P
*
* This function expects to be called with @entry->rw_lock write-hold.
*/
static void
pdcspath_store(struct pdcspath_entry *entry)
{
struct device_path *devpath;
BUG_ON(!entry);
devpath = &entry->devpath;
/* We expect the caller to set the ready flag to 0 if the hardware
path struct provided is invalid, so that we know we have to fill it.
First case, we don't have a preset hwpath... */
if (!entry->ready) {
/* ...but we have a device, map it */
BUG_ON(!entry->dev);
device_to_hwpath(entry->dev, (struct hardware_path *)devpath);
}
/* else, we expect the provided hwpath to be valid. */
DPRINTK("%s: store: 0x%p, 0x%p, addr: 0x%lx\n", __func__,
entry, devpath, entry->addr);
/* addr, devpath and count must be word aligned */
if (pdc_stable_write(entry->addr, devpath, sizeof(*devpath)) != PDC_OK) {
printk(KERN_ERR "%s: an error occured when writing to PDC.\n"
"It is likely that the Stable Storage data has been corrupted.\n"
"Please check it carefully upon next reboot.\n", __func__);
WARN_ON(1);
}
/* kobject is already registered */
entry->ready = 2;
DPRINTK("%s: device: 0x%p\n", __func__, entry->dev);
}
static void
pdcspath_store(struct pdcspath_entry *entry)
{
struct device_path *devpath;
BUG_ON(!entry);
devpath = &entry->devpath;
if (!entry->ready) {
BUG_ON(!entry->dev);
device_to_hwpath(entry->dev, (struct hardware_path *)devpath);
}
DPRINTK("%s: store: 0x%p, 0x%p, addr: 0x%lx\n", __func__,
entry, devpath, entry->addr);
if (pdc_stable_write(entry->addr, devpath, sizeof(*devpath)) != PDC_OK) {
printk(KERN_ERR "%s: an error occurred when writing to PDC.\n"
"It is likely that the Stable Storage data has been corrupted.\n"
"Please check it carefully upon next reboot.\n", __func__);
WARN_ON(1);
}
entry->ready = 2;
DPRINTK("%s: device: 0x%p\n", __func__, entry->dev);
}
