1 files changed, 219 insertions, 137 deletions

diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c
index 509a5b3..053ee84 100644
--- a/drivers/pci/hotplug/acpiphp_glue.c
+++ b/drivers/pci/hotplug/acpiphp_glue.c
@@ -46,7 +46,7 @@
 #include <linux/kernel.h>
 #include <linux/pci.h>
 #include <linux/smp_lock.h>
-#include <asm/semaphore.h>
+#include <linux/mutex.h>
 
 #include "../pci.h"
 #include "pci_hotplug.h"
@@ -57,7 +57,6 @@ static LIST_HEAD(bridge_list);
 #define MY_NAME "acpiphp_glue"
 
 static void handle_hotplug_event_bridge (acpi_handle, u32, void *);
-static void handle_hotplug_event_func (acpi_handle, u32, void *);
 static void acpiphp_sanitize_bus(struct pci_bus *bus);
 static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus);
 
@@ -125,11 +124,11 @@ register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
 	struct acpiphp_bridge *bridge = (struct acpiphp_bridge *)context;
 	struct acpiphp_slot *slot;
 	struct acpiphp_func *newfunc;
+	struct dependent_device *dd;
 	acpi_handle tmp;
 	acpi_status status = AE_OK;
 	unsigned long adr, sun;
-	int device, function;
-	static int num_slots = 0;	/* XXX if we support I/O node hotplug... */
+	int device, function, retval;
 
 	status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
 
@@ -138,21 +137,21 @@ register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
 
 	status = acpi_get_handle(handle, "_EJ0", &tmp);
 
-	if (ACPI_FAILURE(status))
+	if (ACPI_FAILURE(status) && !(is_dependent_device(handle)))
 		return AE_OK;
 
 	device = (adr >> 16) & 0xffff;
 	function = adr & 0xffff;
 
-	newfunc = kmalloc(sizeof(struct acpiphp_func), GFP_KERNEL);
+	newfunc = kzalloc(sizeof(struct acpiphp_func), GFP_KERNEL);
 	if (!newfunc)
 		return AE_NO_MEMORY;
-	memset(newfunc, 0, sizeof(struct acpiphp_func));
 
 	INIT_LIST_HEAD(&newfunc->sibling);
 	newfunc->handle = handle;
 	newfunc->function = function;
-	newfunc->flags = FUNC_HAS_EJ0;
+	if (ACPI_SUCCESS(status))
+		newfunc->flags = FUNC_HAS_EJ0;
 
 	if (ACPI_SUCCESS(acpi_get_handle(handle, "_STA", &tmp)))
 		newfunc->flags |= FUNC_HAS_STA;
@@ -163,6 +162,19 @@ register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
 	if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &tmp)))
 		newfunc->flags |= FUNC_HAS_PS3;
 
+	if (ACPI_SUCCESS(acpi_get_handle(handle, "_DCK", &tmp))) {
+		newfunc->flags |= FUNC_HAS_DCK;
+		/* add to devices dependent on dock station,
+		 * because this may actually be the dock bridge
+		 */
+		dd = alloc_dependent_device(handle);
+                if (!dd)
+                        err("Can't allocate memory for "
+				"new dependent device!\n");
+		else
+			add_dependent_device(dd);
+	}
+
 	status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
 	if (ACPI_FAILURE(status))
 		sun = -1;
@@ -176,19 +188,17 @@ register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
 		}
 
 	if (!slot) {
-		slot = kmalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
+		slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
 		if (!slot) {
 			kfree(newfunc);
 			return AE_NO_MEMORY;
 		}
 
-		memset(slot, 0, sizeof(struct acpiphp_slot));
 		slot->bridge = bridge;
-		slot->id = num_slots++;
 		slot->device = device;
 		slot->sun = sun;
 		INIT_LIST_HEAD(&slot->funcs);
-		init_MUTEX(&slot->crit_sect);
+		mutex_init(&slot->crit_sect);
 
 		slot->next = bridge->slots;
 		bridge->slots = slot;
@@ -198,6 +208,11 @@ register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
 		dbg("found ACPI PCI Hotplug slot %d at PCI %04x:%02x:%02x\n",
 				slot->sun, pci_domain_nr(bridge->pci_bus),
 				bridge->pci_bus->number, slot->device);
+		retval = acpiphp_register_hotplug_slot(slot);
+		if (retval) {
+			warn("acpiphp_register_hotplug_slot failed(err code = 0x%x)\n", retval);
+			goto err_exit;
+		}
 	}
 
 	newfunc->slot = slot;
@@ -210,16 +225,41 @@ register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
 		slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON);
 	}
 
+	/* if this is a device dependent on a dock station,
+	 * associate the acpiphp_func to the dependent_device
+ 	 * struct.
+	 */
+	if ((dd = get_dependent_device(handle))) {
+		newfunc->flags |= FUNC_IS_DD;
+		/*
+		 * we don't want any devices which is dependent
+		 * on the dock to have it's _EJ0 method executed.
+		 * because we need to run _DCK first.
+		 */
+		newfunc->flags &= ~FUNC_HAS_EJ0;
+		dd->func = newfunc;
+		add_pci_dependent_device(dd);
+	}
+
 	/* install notify handler */
-	status = acpi_install_notify_handler(handle,
+	if (!(newfunc->flags & FUNC_HAS_DCK)) {
+		status = acpi_install_notify_handler(handle,
 					     ACPI_SYSTEM_NOTIFY,
 					     handle_hotplug_event_func,
 					     newfunc);
 
-	if (ACPI_FAILURE(status)) {
-		err("failed to register interrupt notify handler\n");
-		return status;
-	}
+		if (ACPI_FAILURE(status))
+			err("failed to register interrupt notify handler\n");
+	} else
+		status = AE_OK;
+
+	return status;
+
+ err_exit:
+	bridge->nr_slots--;
+	bridge->slots = slot->next;
+	kfree(slot);
+	kfree(newfunc);
 
 	return AE_OK;
 }
@@ -245,57 +285,19 @@ static int detect_ejectable_slots(acpi_handle *bridge_handle)
 static void decode_hpp(struct acpiphp_bridge *bridge)
 {
 	acpi_status status;
-	struct acpi_buffer buffer = { .length = ACPI_ALLOCATE_BUFFER,
-				      .pointer = NULL};
-	union acpi_object *package;
-	int i;
-
-	/* default numbers */
-	bridge->hpp.cache_line_size = 0x10;
-	bridge->hpp.latency_timer = 0x40;
-	bridge->hpp.enable_SERR = 0;
-	bridge->hpp.enable_PERR = 0;
-
-	status = acpi_evaluate_object(bridge->handle, "_HPP", NULL, &buffer);
 
+	status = acpi_get_hp_params_from_firmware(bridge->pci_dev, &bridge->hpp);
 	if (ACPI_FAILURE(status)) {
-		dbg("_HPP evaluation failed\n");
-		return;
+		/* use default numbers */
+		bridge->hpp.cache_line_size = 0x10;
+		bridge->hpp.latency_timer = 0x40;
+		bridge->hpp.enable_serr = 0;
+		bridge->hpp.enable_perr = 0;
 	}
-
-	package = (union acpi_object *) buffer.pointer;
-
-	if (!package || package->type != ACPI_TYPE_PACKAGE ||
-	    package->package.count != 4 || !package->package.elements) {
-		err("invalid _HPP object; ignoring\n");
-		goto err_exit;
-	}
-
-	for (i = 0; i < 4; i++) {
-		if (package->package.elements[i].type != ACPI_TYPE_INTEGER) {
-			err("invalid _HPP parameter type; ignoring\n");
-			goto err_exit;
-		}
-	}
-
-	bridge->hpp.cache_line_size = package->package.elements[0].integer.value;
-	bridge->hpp.latency_timer = package->package.elements[1].integer.value;
-	bridge->hpp.enable_SERR = package->package.elements[2].integer.value;
-	bridge->hpp.enable_PERR = package->package.elements[3].integer.value;
-
-	dbg("_HPP parameter = (%02x, %02x, %02x, %02x)\n",
-		bridge->hpp.cache_line_size,
-		bridge->hpp.latency_timer,
-		bridge->hpp.enable_SERR,
-		bridge->hpp.enable_PERR);
-
-	bridge->flags |= BRIDGE_HAS_HPP;
-
- err_exit:
-	kfree(buffer.pointer);
 }
 
 
+
 /* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */
 static void init_bridge_misc(struct acpiphp_bridge *bridge)
 {
@@ -304,9 +306,16 @@ static void init_bridge_misc(struct acpiphp_bridge *bridge)
 	/* decode ACPI 2.0 _HPP (hot plug parameters) */
 	decode_hpp(bridge);
 
+	/* must be added to the list prior to calling register_slot */
+	list_add(&bridge->list, &bridge_list);
+
 	/* register all slot objects under this bridge */
 	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1,
 				     register_slot, bridge, NULL);
+	if (ACPI_FAILURE(status)) {
+		list_del(&bridge->list);
+		return;
+	}
 
 	/* install notify handler */
 	if (bridge->type != BRIDGE_TYPE_HOST) {
@@ -319,8 +328,6 @@ static void init_bridge_misc(struct acpiphp_bridge *bridge)
 			err("failed to register interrupt notify handler\n");
 		}
 	}
-
-	list_add(&bridge->list, &bridge_list);
 }
 
 
@@ -329,12 +336,10 @@ static void add_host_bridge(acpi_handle *handle, struct pci_bus *pci_bus)
 {
 	struct acpiphp_bridge *bridge;
 
-	bridge = kmalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
+	bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
 	if (bridge == NULL)
 		return;
 
-	memset(bridge, 0, sizeof(struct acpiphp_bridge));
-
 	bridge->type = BRIDGE_TYPE_HOST;
 	bridge->handle = handle;
 
@@ -351,14 +356,12 @@ static void add_p2p_bridge(acpi_handle *handle, struct pci_dev *pci_dev)
 {
 	struct acpiphp_bridge *bridge;
 
-	bridge = kmalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
+	bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
 	if (bridge == NULL) {
 		err("out of memory\n");
 		return;
 	}
 
-	memset(bridge, 0, sizeof(struct acpiphp_bridge));
-
 	bridge->type = BRIDGE_TYPE_P2P;
 	bridge->handle = handle;
 
@@ -410,11 +413,18 @@ find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
 		goto out;
 
 	/* check if this bridge has ejectable slots */
-	if (detect_ejectable_slots(handle) > 0) {
+	if ((detect_ejectable_slots(handle) > 0) ||
+		(detect_dependent_devices(handle) > 0)) {
 		dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev));
 		add_p2p_bridge(handle, dev);
 	}
 
+	/* search P2P bridges under this p2p bridge */
+	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
+				     find_p2p_bridge, dev->subordinate, NULL);
+	if (ACPI_FAILURE(status))
+		warn("find_p2p_bridge faied (error code = 0x%x)\n", status);
+
  out:
 	pci_dev_put(dev);
 	return AE_OK;
@@ -512,15 +522,19 @@ static void cleanup_bridge(struct acpiphp_bridge *bridge)
 		list_for_each_safe (list, tmp, &slot->funcs) {
 			struct acpiphp_func *func;
 			func = list_entry(list, struct acpiphp_func, sibling);
-			status = acpi_remove_notify_handler(func->handle,
+			if (!(func->flags & FUNC_HAS_DCK)) {
+				status = acpi_remove_notify_handler(func->handle,
 						ACPI_SYSTEM_NOTIFY,
 						handle_hotplug_event_func);
-			if (ACPI_FAILURE(status))
-				err("failed to remove notify handler\n");
+				if (ACPI_FAILURE(status))
+					err("failed to remove notify handler\n");
+			}
 			pci_dev_put(func->pci_dev);
 			list_del(list);
 			kfree(func);
 		}
+		acpiphp_unregister_hotplug_slot(slot);
+		list_del(&slot->funcs);
 		kfree(slot);
 		slot = next;
 	}
@@ -551,7 +565,8 @@ static void remove_bridge(acpi_handle handle)
 	} else {
 		/* clean-up p2p bridges under this host bridge */
 		acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
-				(u32)1, cleanup_p2p_bridge, NULL, NULL);
+				    ACPI_UINT32_MAX, cleanup_p2p_bridge,
+				    NULL, NULL);
 	}
 }
 
@@ -751,6 +766,113 @@ static int power_off_slot(struct acpiphp_slot *slot)
 }
 
 
+
+/**
+ * acpiphp_max_busnr - return the highest reserved bus number under
+ * the given bus.
+ * @bus: bus to start search with
+ *
+ */
+static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
+{
+	struct list_head *tmp;
+	unsigned char max, n;
+
+	/*
+	 * pci_bus_max_busnr will return the highest
+	 * reserved busnr for all these children.
+	 * that is equivalent to the bus->subordinate
+	 * value.  We don't want to use the parent's
+	 * bus->subordinate value because it could have
+	 * padding in it.
+	 */
+	max = bus->secondary;
+
+	list_for_each(tmp, &bus->children) {
+		n = pci_bus_max_busnr(pci_bus_b(tmp));
+		if (n > max)
+			max = n;
+	}
+	return max;
+}
+
+
+
+/**
+ *  get_func - get a pointer to acpiphp_func given a slot, device
+ *  @slot: slot to search
+ *  @dev:  pci_dev struct to match.
+ *
+ *  This function will increase the reference count of pci_dev,
+ *  so callers should call pci_dev_put when complete.
+ *
+ */
+static struct acpiphp_func *
+get_func(struct acpiphp_slot *slot, struct pci_dev *dev)
+{
+	struct acpiphp_func *func = NULL;
+	struct pci_bus *bus = slot->bridge->pci_bus;
+	struct pci_dev *pdev;
+
+	list_for_each_entry(func, &slot->funcs, sibling) {
+		pdev = pci_get_slot(bus, PCI_DEVFN(slot->device,
+					func->function));
+		if (pdev) {
+			if (pdev == dev)
+				break;
+			pci_dev_put(pdev);
+		}
+	}
+	return func;
+}
+
+
+/**
+ * acpiphp_bus_add - add a new bus to acpi subsystem
+ * @func: acpiphp_func of the bridge
+ *
+ */
+static int acpiphp_bus_add(struct acpiphp_func *func)
+{
+	acpi_handle phandle;
+	struct acpi_device *device, *pdevice;
+	int ret_val;
+
+	acpi_get_parent(func->handle, &phandle);
+	if (acpi_bus_get_device(phandle, &pdevice)) {
+		dbg("no parent device, assuming NULL\n");
+		pdevice = NULL;
+	}
+	if (!acpi_bus_get_device(func->handle, &device)) {
+		dbg("bus exists... trim\n");
+		/* this shouldn't be in here, so remove
+		 * the bus then re-add it...
+		 */
+		ret_val = acpi_bus_trim(device, 1);
+		dbg("acpi_bus_trim return %x\n", ret_val);
+	}
+
+	ret_val = acpi_bus_add(&device, pdevice, func->handle,
+		ACPI_BUS_TYPE_DEVICE);
+	if (ret_val) {
+		dbg("error adding bus, %x\n",
+			-ret_val);
+		goto acpiphp_bus_add_out;
+	}
+	/*
+	 * try to start anyway.  We could have failed to add
+	 * simply because this bus had previously been added
+	 * on another add.  Don't bother with the return value
+	 * we just keep going.
+	 */
+	ret_val = acpi_bus_start(device);
+
+acpiphp_bus_add_out:
+	return ret_val;
+}
+
+
+
 /**
  * enable_device - enable, configure a slot
  * @slot: slot to be enabled
@@ -788,7 +910,7 @@ static int enable_device(struct acpiphp_slot *slot)
 		goto err_exit;
 	}
 
-	max = bus->secondary;
+	max = acpiphp_max_busnr(bus);
 	for (pass = 0; pass < 2; pass++) {
 		list_for_each_entry(dev, &bus->devices, bus_list) {
 			if (PCI_SLOT(dev->devfn) != slot->device)
@@ -796,8 +918,15 @@ static int enable_device(struct acpiphp_slot *slot)
 			if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
 			    dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
 				max = pci_scan_bridge(bus, dev, max, pass);
-				if (pass && dev->subordinate)
+				if (pass && dev->subordinate) {
 					pci_bus_size_bridges(dev->subordinate);
+					func = get_func(slot, dev);
+					if (func) {
+						acpiphp_bus_add(func);
+						/* side effect of get_func */
+						pci_dev_put(dev);
+					}
+				}
 			}
 		}
 	}
@@ -806,8 +935,8 @@ static int enable_device(struct acpiphp_slot *slot)
 	acpiphp_sanitize_bus(bus);
 	pci_enable_bridges(bus);
 	pci_bus_add_devices(bus);
-	acpiphp_set_hpp_values(DEVICE_ACPI_HANDLE(&bus->self->dev), bus);
-	acpiphp_configure_ioapics(DEVICE_ACPI_HANDLE(&bus->self->dev));
+	acpiphp_set_hpp_values(slot->bridge->handle, bus);
+	acpiphp_configure_ioapics(slot->bridge->handle);
 
 	/* associate pci_dev to our representation */
 	list_for_each (l, &slot->funcs) {
@@ -987,11 +1116,11 @@ static void program_hpp(struct pci_dev *dev, struct acpiphp_bridge *bridge)
 	pci_write_config_byte(dev, PCI_LATENCY_TIMER,
 			bridge->hpp.latency_timer);
 	pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
-	if (bridge->hpp.enable_SERR)
+	if (bridge->hpp.enable_serr)
 		pci_cmd |= PCI_COMMAND_SERR;
 	else
 		pci_cmd &= ~PCI_COMMAND_SERR;
-	if (bridge->hpp.enable_PERR)
+	if (bridge->hpp.enable_perr)
 		pci_cmd |= PCI_COMMAND_PARITY;
 	else
 		pci_cmd &= ~PCI_COMMAND_PARITY;
@@ -1002,11 +1131,11 @@ static void program_hpp(struct pci_dev *dev, struct acpiphp_bridge *bridge)
 		pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER,
 				bridge->hpp.latency_timer);
 		pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl);
-		if (bridge->hpp.enable_SERR)
+		if (bridge->hpp.enable_serr)
 			pci_bctl |= PCI_BRIDGE_CTL_SERR;
 		else
 			pci_bctl &= ~PCI_BRIDGE_CTL_SERR;
-		if (bridge->hpp.enable_PERR)
+		if (bridge->hpp.enable_perr)
 			pci_bctl |= PCI_BRIDGE_CTL_PARITY;
 		else
 			pci_bctl &= ~PCI_BRIDGE_CTL_PARITY;
@@ -1026,6 +1155,7 @@ static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus)
 
 	memset(&bridge, 0, sizeof(bridge));
 	bridge.handle = handle;
+	bridge.pci_dev = bus->self;
 	decode_hpp(&bridge);
 	list_for_each_entry(dev, &bus->devices, bus_list)
 		program_hpp(dev, &bridge);
@@ -1200,7 +1330,7 @@ static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, void *cont
  * handles ACPI event notification on slots
  *
  */
-static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context)
+void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context)
 {
 	struct acpiphp_func *func;
 	char objname[64];
@@ -1242,41 +1372,13 @@ static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *contex
 	}
 }
 
-static int is_root_bridge(acpi_handle handle)
-{
-	acpi_status status;
-	struct acpi_device_info *info;
-	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
-	int i;
-
-	status = acpi_get_object_info(handle, &buffer);
-	if (ACPI_SUCCESS(status)) {
-		info = buffer.pointer;
-		if ((info->valid & ACPI_VALID_HID) &&
-			!strcmp(PCI_ROOT_HID_STRING,
-					info->hardware_id.value)) {
-			acpi_os_free(buffer.pointer);
-			return 1;
-		}
-		if (info->valid & ACPI_VALID_CID) {
-			for (i=0; i < info->compatibility_id.count; i++) {
-				if (!strcmp(PCI_ROOT_HID_STRING,
-					info->compatibility_id.id[i].value)) {
-					acpi_os_free(buffer.pointer);
-					return 1;
-				}
-			}
-		}
-	}
-	return 0;
-}
 
 static acpi_status
 find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
 {
 	int *count = (int *)context;
 
-	if (is_root_bridge(handle)) {
+	if (acpi_root_bridge(handle)) {
 		acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
 				handle_hotplug_event_bridge, NULL);
 			(*count)++;
@@ -1373,26 +1475,6 @@ static int acpiphp_for_each_slot(acpiphp_callback fn, void *data)
 }
 #endif
 
-/* search matching slot from id  */
-struct acpiphp_slot *get_slot_from_id(int id)
-{
-	struct list_head *node;
-	struct acpiphp_bridge *bridge;
-	struct acpiphp_slot *slot;
-
-	list_for_each (node, &bridge_list) {
-		bridge = (struct acpiphp_bridge *)node;
-		for (slot = bridge->slots; slot; slot = slot->next)
-			if (slot->id == id)
-				return slot;
-	}
-
-	/* should never happen! */
-	err("%s: no object for id %d\n", __FUNCTION__, id);
-	WARN_ON(1);
-	return NULL;
-}
-
 
 /**
  * acpiphp_enable_slot - power on slot
@@ -1401,7 +1483,7 @@ int acpiphp_enable_slot(struct acpiphp_slot *slot)
 {
 	int retval;
 
-	down(&slot->crit_sect);
+	mutex_lock(&slot->crit_sect);
 
 	/* wake up all functions */
 	retval = power_on_slot(slot);
@@ -1413,7 +1495,7 @@ int acpiphp_enable_slot(struct acpiphp_slot *slot)
 		retval = enable_device(slot);
 
  err_exit:
-	up(&slot->crit_sect);
+	mutex_unlock(&slot->crit_sect);
 	return retval;
 }
 
@@ -1424,7 +1506,7 @@ int acpiphp_disable_slot(struct acpiphp_slot *slot)
 {
 	int retval = 0;
 
-	down(&slot->crit_sect);
+	mutex_lock(&slot->crit_sect);
 
 	/* unconfigure all functions */
 	retval = disable_device(slot);
@@ -1437,7 +1519,7 @@ int acpiphp_disable_slot(struct acpiphp_slot *slot)
 		goto err_exit;
 
  err_exit:
-	up(&slot->crit_sect);
+	mutex_unlock(&slot->crit_sect);
 	return retval;
 }