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authorAlex Chiang <achiang@hp.com>2008-08-21 17:13:47 -0400
committerJesse Barnes <jbarnes@virtuousgeek.org>2008-08-21 18:15:31 -0400
commitd6a9e9b40be7da84f82eb414c2ad98c5bb69986b (patch)
tree28737d4feaa4b16f63b498229ae13653947f7b36 /drivers/pci
parent167e782e301188c7c7e31e486bbeea5f918324c1 (diff)
PCI: shpchp: Rename duplicate slot name N as N-1, N-2, N-M...
Commit ef0ff95f136f0f2d035667af5d18b824609de320 (shpchp: fix slot name) introduces the shpchp_slot_with_bus module parameter, which was intended to help work around broken firmware that assigns the same name to multiple slots. Commit b3bd307c628af2f0a581c42d5d7e4bcdbbf64b6a (shpchp: add message about shpchp_slot_with_bus option) tells the user to use the above parameter in the event of a name collision. This approach is sub-optimal because it requires too much work from the user. Instead, let's rename the slot on behalf of the user. If firmware assigns the name N to multiple slots, then: The first registered slot is assigned N The second registered slot is assigned N-1 The third registered slot is assigned N-2 The Mth registered slot becomes N-M In the event we overflow the slot->name parameter, we report an error to the user. This is a temporary fix until the entire PCI core can be reworked such that individual drivers no longer have to manage their own slot names. Tested-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> Acked-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> Signed-off-by: Alex Chiang <achiang@hp.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/hotplug/shpchp_core.c34
1 files changed, 15 insertions, 19 deletions
diff --git a/drivers/pci/hotplug/shpchp_core.c b/drivers/pci/hotplug/shpchp_core.c
index a8cbd039b85b..cc38615395f1 100644
--- a/drivers/pci/hotplug/shpchp_core.c
+++ b/drivers/pci/hotplug/shpchp_core.c
@@ -39,7 +39,6 @@
39int shpchp_debug; 39int shpchp_debug;
40int shpchp_poll_mode; 40int shpchp_poll_mode;
41int shpchp_poll_time; 41int shpchp_poll_time;
42static int shpchp_slot_with_bus;
43struct workqueue_struct *shpchp_wq; 42struct workqueue_struct *shpchp_wq;
44 43
45#define DRIVER_VERSION "0.4" 44#define DRIVER_VERSION "0.4"
@@ -53,11 +52,9 @@ MODULE_LICENSE("GPL");
53module_param(shpchp_debug, bool, 0644); 52module_param(shpchp_debug, bool, 0644);
54module_param(shpchp_poll_mode, bool, 0644); 53module_param(shpchp_poll_mode, bool, 0644);
55module_param(shpchp_poll_time, int, 0644); 54module_param(shpchp_poll_time, int, 0644);
56module_param(shpchp_slot_with_bus, bool, 0644);
57MODULE_PARM_DESC(shpchp_debug, "Debugging mode enabled or not"); 55MODULE_PARM_DESC(shpchp_debug, "Debugging mode enabled or not");
58MODULE_PARM_DESC(shpchp_poll_mode, "Using polling mechanism for hot-plug events or not"); 56MODULE_PARM_DESC(shpchp_poll_mode, "Using polling mechanism for hot-plug events or not");
59MODULE_PARM_DESC(shpchp_poll_time, "Polling mechanism frequency, in seconds"); 57MODULE_PARM_DESC(shpchp_poll_time, "Polling mechanism frequency, in seconds");
60MODULE_PARM_DESC(shpchp_slot_with_bus, "Use bus number in the slot name");
61 58
62#define SHPC_MODULE_NAME "shpchp" 59#define SHPC_MODULE_NAME "shpchp"
63 60
@@ -99,23 +96,13 @@ static void release_slot(struct hotplug_slot *hotplug_slot)
99 kfree(slot); 96 kfree(slot);
100} 97}
101 98
102static void make_slot_name(struct slot *slot)
103{
104 if (shpchp_slot_with_bus)
105 snprintf(slot->hotplug_slot->name, SLOT_NAME_SIZE, "%04d_%04d",
106 slot->bus, slot->number);
107 else
108 snprintf(slot->hotplug_slot->name, SLOT_NAME_SIZE, "%d",
109 slot->number);
110}
111
112static int init_slots(struct controller *ctrl) 99static int init_slots(struct controller *ctrl)
113{ 100{
114 struct slot *slot; 101 struct slot *slot;
115 struct hotplug_slot *hotplug_slot; 102 struct hotplug_slot *hotplug_slot;
116 struct hotplug_slot_info *info; 103 struct hotplug_slot_info *info;
117 int retval = -ENOMEM; 104 int retval = -ENOMEM;
118 int i; 105 int i, len, dup = 1;
119 106
120 for (i = 0; i < ctrl->num_slots; i++) { 107 for (i = 0; i < ctrl->num_slots; i++) {
121 slot = kzalloc(sizeof(*slot), GFP_KERNEL); 108 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
@@ -146,7 +133,7 @@ static int init_slots(struct controller *ctrl)
146 /* register this slot with the hotplug pci core */ 133 /* register this slot with the hotplug pci core */
147 hotplug_slot->private = slot; 134 hotplug_slot->private = slot;
148 hotplug_slot->release = &release_slot; 135 hotplug_slot->release = &release_slot;
149 make_slot_name(slot); 136 snprintf(slot->name, SLOT_NAME_SIZE, "%d", slot->number);
150 hotplug_slot->ops = &shpchp_hotplug_slot_ops; 137 hotplug_slot->ops = &shpchp_hotplug_slot_ops;
151 138
152 get_power_status(hotplug_slot, &info->power_status); 139 get_power_status(hotplug_slot, &info->power_status);
@@ -157,14 +144,23 @@ static int init_slots(struct controller *ctrl)
157 dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x " 144 dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x "
158 "slot_device_offset=%x\n", slot->bus, slot->device, 145 "slot_device_offset=%x\n", slot->bus, slot->device,
159 slot->hp_slot, slot->number, ctrl->slot_device_offset); 146 slot->hp_slot, slot->number, ctrl->slot_device_offset);
147duplicate_name:
160 retval = pci_hp_register(slot->hotplug_slot, 148 retval = pci_hp_register(slot->hotplug_slot,
161 ctrl->pci_dev->subordinate, slot->device); 149 ctrl->pci_dev->subordinate, slot->device);
162 if (retval) { 150 if (retval) {
151 /*
152 * If slot N already exists, we'll try to create
153 * slot N-1, N-2 ... N-M, until we overflow.
154 */
155 if (retval == -EEXIST) {
156 len = snprintf(slot->name, SLOT_NAME_SIZE,
157 "%d-%d", slot->number, dup++);
158 if (len < SLOT_NAME_SIZE)
159 goto duplicate_name;
160 else
161 err("duplicate slot name overflow\n");
162 }
163 err("pci_hp_register failed with error %d\n", retval); 163 err("pci_hp_register failed with error %d\n", retval);
164 if (retval == -EEXIST)
165 err("Failed to register slot because of name "
166 "collision. Try \'shpchp_slot_with_bus\' "
167 "module option.\n");
168 goto error_info; 164 goto error_info;
169 } 165 }
170 166