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PCI: rpaphp: Document is_php_dn()

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Fix up the documentation: the rpaphp_add_slot() does not actually
handle embedded slots: in fact, it ignores them. Fix the flow of
control in the routine that checks for embedded slots.

Signed-off-by: Linas Vepstas <linas@austin.ibm.com>
Cc: John Rose <johnrose@austin.ibm.com>
Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Linas Vepstas 2007-04-13 15:34:22 -07:00 committed by Greg Kroah-Hartman
parent 8485d1a123
commit da65944be2
1 changed files with 29 additions and 13 deletions
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40
drivers/pci/hotplug/rpaphp_core.c
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@ -262,6 +262,14 @@ static int is_php_type(char *drc_type)
return 1;
}
/**
* is_php_dn() - return 1 if this is a hotpluggable pci slot, else 0
*
* This routine will return true only if the device node is
* a hotpluggable slot. This routine will return false
* for built-in pci slots (even when the built-in slots are
* dlparable.)
*/
static int is_php_dn(struct device_node *dn, const int **indexes,
const int **names, const int **types, const int **power_domains)
{
@ -269,24 +277,31 @@ static int is_php_dn(struct device_node *dn, const int **indexes,
int rc;
rc = get_children_props(dn, indexes, names, &drc_types, power_domains);
if (rc >= 0) {
if (is_php_type((char *) &drc_types[1])) {
if (rc < 0)
return 0;
if (!is_php_type((char *) &drc_types[1]))
return 0;
*types = drc_types;
return 1;
}
}
return 0;
}
/**
* rpaphp_add_slot -- add hotplug or dlpar slot
* rpaphp_add_slot -- declare a hotplug slot to the hotplug subsystem.
* @dn device node of slot
*
* rpaphp not only registers PCI hotplug slots(HOTPLUG),
* but also logical DR slots(EMBEDDED).
* HOTPLUG slot: An adapter can be physically added/removed.
* EMBEDDED slot: An adapter can be logically removed/added
* from/to a partition with the slot.
* This subroutine will register a hotplugable slot with the
* PCI hotplug infrastructure. This routine is typicaly called
* during boot time, if the hotplug slots are present at boot time,
* or is called later, by the dlpar add code, if the slot is
* being dynamically added during runtime.
*
* If the device node points at an embedded (built-in) slot, this
* routine will just return without doing anything, since embedded
* slots cannot be hotplugged.
*
* To remove a slot, it suffices to call rpaphp_deregister_slot()
*/
int rpaphp_add_slot(struct device_node *dn)
{
@ -299,6 +314,7 @@ int rpaphp_add_slot(struct device_node *dn)
if (!dn->name || strcmp(dn->name, "pci"))
return 0;
/* If this is not a hotplug slot, return without doing anything. */
if (!is_php_dn(dn, &indexes, &names, &types, &power_domains))
return 0;