[PATCH] PCI Hotplug: Fix echoing 1 to power file of enabled slot problem with SHPC driver

Here is a patch to fix the problem of echoing 1 to "power" file
to enabled slot causing the slot to power down, and echoing 0
to disabled slot causing shpchp_disabled_slot() to be called
twice. This problem was reported by kenji Kaneshige.

Thanks,
Dely

Signed-off-by: Dely Sy <dely.l.sy@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 15 insertions, 15 deletions

diff --git a/drivers/pci/hotplug/shpchp_ctrl.c b/drivers/pci/hotplug/shpchp_ctrl.c
index 9f90eb8e6ecd..490a9553a062 100644
--- a/drivers/pci/hotplug/shpchp_ctrl.c
+++ b/drivers/pci/hotplug/shpchp_ctrl.c
@@ -1885,7 +1885,7 @@ int shpchp_enable_slot (struct slot *p_slot)
         func = shpchp_slot_find(p_slot->bus, p_slot->device, 0);
         if (!func) {
                 dbg("%s: Error! slot NULL\n", __FUNCTION__);
-                return 1;
+                return -ENODEV;
         }
 
         /* Check to see if (latch closed, card present, power off) */
@@ -1894,19 +1894,19 @@ int shpchp_enable_slot (struct slot *p_slot)
         if (rc || !getstatus) {
                 info("%s: no adapter on slot(%x)\n", __FUNCTION__, p_slot->number);
                 up(&p_slot->ctrl->crit_sect);
-                return 1;
+                return -ENODEV;
         }
         rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
         if (rc || getstatus) {
                 info("%s: latch open on slot(%x)\n", __FUNCTION__, p_slot->number);
                 up(&p_slot->ctrl->crit_sect);
-                return 1;
+                return -ENODEV;
         }
         rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
         if (rc || getstatus) {
                 info("%s: already enabled on slot(%x)\n", __FUNCTION__, p_slot->number);
                 up(&p_slot->ctrl->crit_sect);
-                return 1;
+                return -ENODEV;
         }
         up(&p_slot->ctrl->crit_sect);
 
@@ -1914,7 +1914,7 @@ int shpchp_enable_slot (struct slot *p_slot)
 
         func = shpchp_slot_create(p_slot->bus);
         if (func == NULL)
-                return 1;
+                return -ENOMEM;
 
         func->bus = p_slot->bus;
         func->device = p_slot->device;
@@ -1939,7 +1939,7 @@ int shpchp_enable_slot (struct slot *p_slot)
                 /* Setup slot structure with entry for empty slot */
                 func = shpchp_slot_create(p_slot->bus);
                 if (func == NULL)
-                        return (1);     /* Out of memory */
+                        return -ENOMEM; /* Out of memory */
 
                 func->bus = p_slot->bus;
                 func->device = p_slot->device;
@@ -1972,7 +1972,7 @@ int shpchp_disable_slot (struct slot *p_slot)
         struct pci_func *func;
 
         if (!p_slot->ctrl)
-                return 1;
+                return -ENODEV;
 
         pci_bus = p_slot->ctrl->pci_dev->subordinate;
 
@@ -1983,19 +1983,19 @@ int shpchp_disable_slot (struct slot *p_slot)
         if (ret || !getstatus) {
                 info("%s: no adapter on slot(%x)\n", __FUNCTION__, p_slot->number);
                 up(&p_slot->ctrl->crit_sect);
-                return 1;
+                return -ENODEV;
         }
         ret = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
         if (ret || getstatus) {
                 info("%s: latch open on slot(%x)\n", __FUNCTION__, p_slot->number);
                 up(&p_slot->ctrl->crit_sect);
-                return 1;
+                return -ENODEV;
         }
         ret = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
         if (ret || !getstatus) {
                 info("%s: already disabled slot(%x)\n", __FUNCTION__, p_slot->number);
                 up(&p_slot->ctrl->crit_sect);
-                return 1;
+                return -ENODEV;
         }
         up(&p_slot->ctrl->crit_sect);
 
@@ -2011,7 +2011,7 @@ int shpchp_disable_slot (struct slot *p_slot)
                 /* Check the Class Code */
                 rc = pci_bus_read_config_byte (pci_bus, devfn, 0x0B, &class_code);
                 if (rc)
-                        return rc;
+                        return -ENODEV;
 
                 if (class_code == PCI_BASE_CLASS_DISPLAY) {
                         /* Display/Video adapter (not supported) */
@@ -2020,13 +2020,13 @@ int shpchp_disable_slot (struct slot *p_slot)
                         /* See if it's a bridge */
                         rc = pci_bus_read_config_byte (pci_bus, devfn, PCI_HEADER_TYPE, &header_type);
                         if (rc)
-                                return rc;
+                                return -ENODEV;
 
                         /* If it's a bridge, check the VGA Enable bit */
                         if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) {
                                 rc = pci_bus_read_config_byte (pci_bus, devfn, PCI_BRIDGE_CONTROL, &BCR);
                                 if (rc)
-                                        return rc;
+                                        return -ENODEV;
 
                                 /* If the VGA Enable bit is set, remove isn't supported */
                                 if (BCR & PCI_BRIDGE_CTL_VGA) {
@@ -2042,12 +2042,12 @@ int shpchp_disable_slot (struct slot *p_slot)
         if ((func != NULL) && !rc) {
                 rc = remove_board(func, p_slot->ctrl);
         } else if (!rc)
-                rc = 1;
+                rc = -ENODEV;
 
         if (p_slot)
                 update_slot_info(p_slot);
 
-        return(rc);
+        return rc;
 }