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Subject[PATCH] PCI hotplug changes for 2.5.63
From
Date
ChangeSet 1.1022.1.1, 2003/02/24 16:24:48-08:00, greg@kroah.com

[PATCH] IBM PCI Hotplug: Clean up the error handling logic for a number of functions, and fix a locking mess.


diff -Nru a/drivers/hotplug/ibmphp.h b/drivers/hotplug/ibmphp.h
--- a/drivers/hotplug/ibmphp.h Mon Feb 24 17:16:04 2003
+++ b/drivers/hotplug/ibmphp.h Mon Feb 24 17:16:04 2003
@@ -761,6 +761,7 @@

extern int ibmphp_init_devno (struct slot **); /* This function is called from EBDA, so we need it not be static */
extern int ibmphp_disable_slot (struct hotplug_slot *); /* This function is called from HPC, so we need it to not be static */
+extern int ibmphp_do_disable_slot (struct slot *slot_cur);
extern int ibmphp_update_slot_info (struct slot *); /* This function is called from HPC, so we need it to not be be static */
extern int ibmphp_configure_card (struct pci_func *, u8);
extern int ibmphp_unconfigure_card (struct slot **, int);
diff -Nru a/drivers/hotplug/ibmphp_core.c b/drivers/hotplug/ibmphp_core.c
--- a/drivers/hotplug/ibmphp_core.c Mon Feb 24 17:16:04 2003
+++ b/drivers/hotplug/ibmphp_core.c Mon Feb 24 17:16:04 2003
@@ -1274,7 +1274,6 @@
int rc, i, rcpr;
struct slot *slot_cur;
u8 function;
- u8 faulted = 0;
struct pci_func *tmp_func;

ibmphp_lock_operations ();
@@ -1284,16 +1283,7 @@

if ((rc = validate (slot_cur, ENABLE))) {
err ("validate function failed \n");
- attn_off (slot_cur); /* need to turn off if was blinking b4 */
- attn_on (slot_cur);
- rc = slot_update (&slot_cur);
- if (rc) {
- ibmphp_unlock_operations();
- return rc;
- }
- ibmphp_update_slot_info (slot_cur);
- ibmphp_unlock_operations ();
- return rc;
+ goto error_nopower;
}

attn_LED_blink (slot_cur);
@@ -1301,10 +1291,7 @@
rc = set_bus (slot_cur);
if (rc) {
err ("was not able to set the bus \n");
- attn_off (slot_cur);
- attn_on (slot_cur);
- ibmphp_unlock_operations ();
- return -ENODEV;
+ goto error_nopower;
}

/*-----------------debugging------------------------------*/
@@ -1314,18 +1301,12 @@

rc = check_limitations (slot_cur);
if (rc) {
- err ("Adding this card exceeds the limitations of this bus. \n");
- err ("(i.e., >1 133MHz cards running on same bus, or >2 66 PCI cards running on same bus \n. Try hot-adding into another bus \n");
- attn_off (slot_cur);
- attn_on (slot_cur);
-
- if (slot_update (&slot_cur)) {
- ibmphp_unlock_operations ();
- return -ENODEV;
- }
- ibmphp_update_slot_info (slot_cur);
- ibmphp_unlock_operations ();
- return -EINVAL;
+ err ("Adding this card exceeds the limitations of this bus.\n");
+ err ("(i.e., >1 133MHz cards running on same bus, or "
+ ">2 66 PCI cards running on same bus\n.");
+ err ("Try hot-adding into another bus \n");
+ rc = -EINVAL;
+ goto error_nopower;
}

rc = power_on (slot_cur);
@@ -1338,8 +1319,8 @@
if (slot_update (&slot_cur)) {
attn_off (slot_cur);
attn_on (slot_cur);
- ibmphp_unlock_operations ();
- return -ENODEV;
+ rc = -ENODEV;
+ goto exit;
}
/* Check to see the error of why it failed */
if ((SLOT_POWER (slot_cur->status)) && !(SLOT_PWRGD (slot_cur->status)))
@@ -1352,8 +1333,7 @@
print_card_capability (slot_cur);
}
ibmphp_update_slot_info (slot_cur);
- ibmphp_unlock_operations ();
- return rc;
+ goto exit;
}
debug ("after power_on\n");
/*-----------------------debugging---------------------------*/
@@ -1362,61 +1342,32 @@
/*----------------------------------------------------------*/

rc = slot_update (&slot_cur);
- if (rc) {
- attn_off (slot_cur);
- attn_on (slot_cur);
- rcpr = power_off (slot_cur);
- if (rcpr) {
- ibmphp_unlock_operations ();
- return rcpr;
- }
- ibmphp_unlock_operations ();
- return rc;
- }
+ if (rc)
+ goto error_power;

+ rc = -EINVAL;
if (SLOT_POWER (slot_cur->status) && !(SLOT_PWRGD (slot_cur->status))) {
- faulted = 1;
err ("power fault occured trying to power up... \n");
- } else if (SLOT_POWER (slot_cur->status) && (SLOT_BUS_SPEED (slot_cur->status))) {
- faulted = 1;
+ goto error_power;
+ }
+ if (SLOT_POWER (slot_cur->status) && (SLOT_BUS_SPEED (slot_cur->status))) {
err ("bus speed mismatch occured. please check current bus speed and card capability \n");
print_card_capability (slot_cur);
+ goto error_power;
}
/* Don't think this case will happen after above checks... but just in case, for paranoia sake */
- else if (!(SLOT_POWER (slot_cur->status))) {
+ if (!(SLOT_POWER (slot_cur->status))) {
err ("power on failed... \n");
- faulted = 1;
- }
- if (faulted) {
- attn_off (slot_cur); /* need to turn off b4 on */
- attn_on (slot_cur);
- rcpr = power_off (slot_cur);
- if (rcpr) {
- ibmphp_unlock_operations ();
- return rcpr;
- }
-
- if (slot_update (&slot_cur)) {
- ibmphp_unlock_operations ();
- return -ENODEV;
- }
- ibmphp_update_slot_info (slot_cur);
- ibmphp_unlock_operations ();
- return -EINVAL;
+ goto error_power;
}

slot_cur->func = (struct pci_func *) kmalloc (sizeof (struct pci_func), GFP_KERNEL);
- if (!slot_cur->func) { /* We cannot do update_slot_info here, since no memory for kmalloc n.e.ways, and update_slot_info allocates some */
+ if (!slot_cur->func) {
+ /* We cannot do update_slot_info here, since no memory for
+ * kmalloc n.e.ways, and update_slot_info allocates some */
err ("out of system memory \n");
- attn_off (slot_cur);
- attn_on (slot_cur);
- rcpr = power_off (slot_cur);
- if (rcpr) {
- ibmphp_unlock_operations ();
- return rcpr;
- }
- ibmphp_unlock_operations ();
- return -ENOMEM;
+ rc = -ENOMEM;
+ goto error_power;
}
memset (slot_cur->func, 0, sizeof (struct pci_func));
slot_cur->func->busno = slot_cur->bus;
@@ -1431,21 +1382,10 @@
ibmphp_unconfigure_card (&slot_cur, 1); /* true because don't need to actually deallocate resources, just remove references */
debug ("after unconfigure_card\n");
slot_cur->func = NULL;
- attn_off (slot_cur); /* need to turn off in case was blinking */
- attn_on (slot_cur);
- rcpr = power_off (slot_cur);
- if (rcpr) {
- ibmphp_unlock_operations ();
- return rcpr;
- }
- if (slot_update (&slot_cur)) {
- ibmphp_unlock_operations();
- return -ENODEV;
- }
- ibmphp_update_slot_info (slot_cur);
- ibmphp_unlock_operations ();
- return -ENOMEM;
+ rc = -ENOMEM;
+ goto error_power;
}
+
function = 0x00;
do {
tmp_func = ibm_slot_find (slot_cur->bus, slot_cur->func->device, function++);
@@ -1455,13 +1395,36 @@

attn_off (slot_cur);
if (slot_update (&slot_cur)) {
- ibmphp_unlock_operations ();
- return -EFAULT;
+ rc = -EFAULT;
+ goto exit;
}
ibmphp_print_test ();
rc = ibmphp_update_slot_info (slot_cur);
+exit:
ibmphp_unlock_operations();
return rc;
+
+error_nopower:
+ attn_off (slot_cur); /* need to turn off if was blinking b4 */
+ attn_on (slot_cur);
+error_cont:
+ rcpr = slot_update (&slot_cur);
+ if (rcpr) {
+ rc = rcpr;
+ goto exit;
+ }
+ ibmphp_update_slot_info (slot_cur);
+ goto exit;
+
+error_power:
+ attn_off (slot_cur); /* need to turn off if was blinking b4 */
+ attn_on (slot_cur);
+ rcpr = power_off (slot_cur);
+ if (rcpr) {
+ rc = rcpr;
+ goto exit;
+ }
+ goto error_cont;
}

/**************************************************************
@@ -1472,45 +1435,34 @@
**************************************************************/
int ibmphp_disable_slot (struct hotplug_slot *hotplug_slot)
{
+ struct slot *slot = hotplug_slot->private;
+ int rc;
+
+ ibmphp_lock_operations();
+ rc = ibmphp_do_disable_slot(slot);
+ ibmphp_unlock_operations();
+ return rc;
+}
+
+int ibmphp_do_disable_slot (struct slot *slot_cur)
+{
int rc;
- struct slot *slot_cur = (struct slot *) hotplug_slot->private;
u8 flag;
int parm = 0;

debug ("DISABLING SLOT... \n");

- if (slot_cur == NULL) {
- ibmphp_unlock_operations ();
- return -ENODEV;
- }
-
- if (slot_cur->ctrl == NULL) {
- ibmphp_unlock_operations ();
+ if ((slot_cur == NULL) || (slot_cur->ctrl == NULL)) {
return -ENODEV;
}

- flag = slot_cur->flag; /* to see if got here from polling */
-
- if (flag)
- ibmphp_lock_operations ();
-
+ flag = slot_cur->flag;
slot_cur->flag = TRUE;

if (flag == TRUE) {
rc = validate (slot_cur, DISABLE); /* checking if powered off already & valid slot # */
- if (rc) {
- /* Need to turn off if was blinking b4 */
- attn_off (slot_cur);
- attn_on (slot_cur);
- if (slot_update (&slot_cur)) {
- ibmphp_unlock_operations ();
- return -EFAULT;
- }
-
- ibmphp_update_slot_info (slot_cur);
- ibmphp_unlock_operations ();
- return rc;
- }
+ if (rc)
+ goto error;
}
attn_LED_blink (slot_cur);

@@ -1519,10 +1471,8 @@
slot_cur->func = (struct pci_func *) kmalloc (sizeof (struct pci_func), GFP_KERNEL);
if (!slot_cur->func) {
err ("out of system memory \n");
- attn_off (slot_cur);
- attn_on (slot_cur);
- ibmphp_unlock_operations ();
- return -ENOMEM;
+ rc = -ENOMEM;
+ goto error;
}
memset (slot_cur->func, 0, sizeof (struct pci_func));
slot_cur->func->busno = slot_cur->bus;
@@ -1531,11 +1481,9 @@

if ((rc = ibm_unconfigure_device (slot_cur->func))) {
err ("removing from kernel failed... \n");
- err ("Please check to see if it was statically linked or is in use otherwise. (perhaps the driver is not 'hot-removable')\n");
- attn_off (slot_cur);
- attn_on (slot_cur);
- ibmphp_unlock_operations ();
- return rc;
+ err ("Please check to see if it was statically linked or is "
+ "in use otherwise. (perhaps the driver is not 'hot-removable')\n");
+ goto error;
}

/* If we got here from latch suddenly opening on operating card or
@@ -1554,43 +1502,34 @@
debug ("in disable_slot. after unconfigure_card\n");
if (rc) {
err ("could not unconfigure card.\n");
- attn_off (slot_cur); /* need to turn off if was blinking b4 */
- attn_on (slot_cur);
-
- if (slot_update (&slot_cur)) {
- ibmphp_unlock_operations ();
- return -EFAULT;
- }
-
- if (flag)
- ibmphp_update_slot_info (slot_cur);
- ibmphp_unlock_operations ();
- return -EFAULT;
+ goto error;
}

- rc = ibmphp_hpc_writeslot (hotplug_slot->private, HPC_SLOT_OFF);
- if (rc) {
- attn_off (slot_cur);
- attn_on (slot_cur);
- if (slot_update (&slot_cur)) {
- ibmphp_unlock_operations ();
- return -EFAULT;
- }
-
- ibmphp_update_slot_info (slot_cur);
- ibmphp_unlock_operations ();
- return rc;
- }
+ rc = ibmphp_hpc_writeslot (slot_cur, HPC_SLOT_OFF);
+ if (rc)
+ goto error;

attn_off (slot_cur);
- if (slot_update (&slot_cur)) {
- ibmphp_unlock_operations ();
- return -EFAULT;
- }
+ rc = slot_update (&slot_cur);
+ if (rc)
+ goto exit;
+
rc = ibmphp_update_slot_info (slot_cur);
ibmphp_print_test ();
- ibmphp_unlock_operations();
+exit:
return rc;
+
+error:
+ /* Need to turn off if was blinking b4 */
+ attn_off (slot_cur);
+ attn_on (slot_cur);
+ if (slot_update (&slot_cur)) {
+ rc = -EFAULT;
+ goto exit;
+ }
+ if (flag)
+ ibmphp_update_slot_info (slot_cur);
+ goto exit;
}

struct hotplug_slot_ops ibmphp_hotplug_slot_ops = {
@@ -1622,6 +1561,7 @@
debug ("after ebda hpc \n");
ibmphp_free_ebda_pci_rsrc_queue ();
debug ("after ebda pci rsrc \n");
+ kfree (ibmphp_pci_bus);
}

static int __init ibmphp_init (void)
@@ -1637,13 +1577,15 @@
ibmphp_pci_bus = kmalloc (sizeof (*ibmphp_pci_bus), GFP_KERNEL);
if (!ibmphp_pci_bus) {
err ("out of memory\n");
- return -ENOMEM;
+ rc = -ENOMEM;
+ goto exit;
}

bus = ibmphp_find_bus (0);
if (!bus) {
err ("Can't find the root pci bus, can not continue\n");
- return -ENODEV;
+ rc -ENODEV;
+ goto error;
}
memcpy (ibmphp_pci_bus, bus, sizeof (*ibmphp_pci_bus));

@@ -1654,39 +1596,39 @@
for (i = 0; i < 16; i++)
irqs[i] = 0;

- if ((rc = ibmphp_access_ebda ())) {
- ibmphp_unload ();
- return rc;
- }
+ if ((rc = ibmphp_access_ebda ()))
+ goto error;
debug ("after ibmphp_access_ebda ()\n");

- if ((rc = ibmphp_rsrc_init ())) {
- ibmphp_unload ();
- return rc;
- }
+ if ((rc = ibmphp_rsrc_init ()))
+ goto error;
debug ("AFTER Resource & EBDA INITIALIZATIONS\n");

max_slots = get_max_slots ();

- if ((rc = ibmphp_register_pci ())) {
- ibmphp_unload ();
- return rc;
- }
+ if ((rc = ibmphp_register_pci ()))
+ goto error;

if (init_ops ()) {
- ibmphp_unload ();
- return -ENODEV;
+ rc = -ENODEV;
+ goto error;
}
+
ibmphp_print_test ();
if ((rc = ibmphp_hpc_start_poll_thread ())) {
- ibmphp_unload ();
- return -ENODEV;
+ goto error;
}

- /* if no NVRAM module selected, lock ourselves into memory with a
- * module count of -1 so that no one can unload us. */
+ /* lock ourselves into memory with a module
+ * count of -1 so that no one can unload us. */
MOD_DEC_USE_COUNT;
- return 0;
+
+exit:
+ return rc;
+
+error:
+ ibmphp_unload ();
+ goto exit;
}

static void __exit ibmphp_exit (void)
diff -Nru a/drivers/hotplug/ibmphp_hpc.c b/drivers/hotplug/ibmphp_hpc.c
--- a/drivers/hotplug/ibmphp_hpc.c Mon Feb 24 17:16:04 2003
+++ b/drivers/hotplug/ibmphp_hpc.c Mon Feb 24 17:16:04 2003
@@ -1063,7 +1063,7 @@
if (disable) {
debug ("process_changeinstatus - disable slot\n");
pslot->flag = FALSE;
- rc = ibmphp_disable_slot (pslot->hotplug_slot);
+ rc = ibmphp_do_disable_slot (pslot);
}

if (update || disable) {
-
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