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Date: Wed, 26 Feb 2003 17:06:47 +0100
From: Dominik Brodowski <linux@brodo.de>
To: torvalds@transmeta.com, Christoph Hellwig <hch@infradead.org>
Cc: linux-kernel@vger.kernel.org
Subject: [PATCH] pcmcia: driver_socket as device_class interface [Was: Re: [RFC] pcmcia: bus pcmcia_bus_type, driver_socket as interface]
Message-ID: <20030226160647.GA1999@brodo.de>
References: <20030224162259.GA2277@brodo.de> <20030224174312.A9951@infradead.org>
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On Mon, Feb 24, 2003 at 05:43:12PM +0000, Christoph Hellwig wrote:
> On Mon, Feb 24, 2003 at 05:22:59PM +0100, Dominik Brodowski wrote:
> > ...
> > 
> > Patch #2: pcmcia-2.5.62-ds-1
> > This starts a change of "Driver Servies" to become a "interface" to
> > pcmcia_socket-class devices. The interface_add_data call is commented out
> > due to a driver model bug (deadlock) Patrick Mochel already knows about. Due
> > to this, removing a driver services module or a socket won't currently work.
> 
> This looks really nice!  Could you post an example driver converted to use
> pcmcia_register_driver() and friends?

This is the 2nd patch -- "Driver Servies" will probably become the 
"bus driver" for PCMCIA (non-CardBus) cards. So register it as an interface
to the device class pcmcia_socket_class. Unfortunately, due to a driver
model bug the actual interface_add_data call is commented out. This only
means that unloading pcmcia sockets won't currently work, loading/enabling
pcmcia sockets should work fine (and does so here).

	Dominik

diff -ru linux-original/drivers/pcmcia/cs.c linux/drivers/pcmcia/cs.c
--- linux-original/drivers/pcmcia/cs.c	2003-02-26 16:37:59.000000000 +0100
+++ linux/drivers/pcmcia/cs.c	2003-02-26 16:49:33.000000000 +0100
@@ -345,6 +345,7 @@
 
 		s->ss_entry = cls_d->ops;
 		s->sock = i + cls_d->sock_offset;
+		s->s_dev = dev;
 
 		/* base address = 0, map = 0 */
 		s->cis_mem.flags = 0;
@@ -359,6 +360,7 @@
 		socket_table[j] = s;
 		if (j == sockets) sockets++;
 
+		s->socket_table_entry = j;
 		init_socket(s);
 		s->ss_entry->inquire_socket(s->sock, &s->cap);
 #ifdef CONFIG_PROC_FS
diff -ru linux-original/drivers/pcmcia/cs_internal.h linux/drivers/pcmcia/cs_internal.h
--- linux-original/drivers/pcmcia/cs_internal.h	2003-02-26 16:37:59.000000000 +0100
+++ linux/drivers/pcmcia/cs_internal.h	2003-02-26 16:49:33.000000000 +0100
@@ -158,7 +158,11 @@
 #ifdef CONFIG_PROC_FS
     struct proc_dir_entry	*proc;
 #endif
-    int				use_bus_pm;
+	int			use_bus_pm;
+	struct device		*s_dev;
+	/* TBD: integrate the following contents fully into this struct */
+	void			*ds_info; /* ds_socket_info */
+	int			socket_table_entry;
 } socket_info_t;
 
 /* Flags in config state */
diff -ru linux-original/drivers/pcmcia/ds.c linux/drivers/pcmcia/ds.c
--- linux-original/drivers/pcmcia/ds.c	2003-02-26 16:48:12.000000000 +0100
+++ linux/drivers/pcmcia/ds.c	2003-02-26 16:51:30.000000000 +0100
@@ -48,6 +48,7 @@
 #include <linux/proc_fs.h>
 #include <linux/poll.h>
 #include <linux/pci.h>
+#include <linux/device.h>
 
 #include <pcmcia/version.h>
 #include <pcmcia/cs_types.h>
@@ -55,6 +56,11 @@
 #include <pcmcia/bulkmem.h>
 #include <pcmcia/cistpl.h>
 #include <pcmcia/ds.h>
+#include <pcmcia/cisreg.h>
+#include <pcmcia/bus_ops.h>
+#include <pcmcia/ss.h>
+
+#include "cs_internal.h"
 
 /*====================================================================*/
 
@@ -68,11 +74,8 @@
 
 #ifdef PCMCIA_DEBUG
 INT_MODULE_PARM(pc_debug, PCMCIA_DEBUG);
-#define DEBUG(n, args...) if (pc_debug>(n)) printk(KERN_DEBUG args)
 static const char *version =
 "ds.c 1.112 2001/10/13 00:08:28 (David Hinds)";
-#else
-#define DEBUG(n, args...)
 #endif
 
 /*====================================================================*/
@@ -97,7 +100,7 @@
 } user_info_t;
 
 /* Socket state information */
-typedef struct socket_info_t {
+struct ds_socket_info {
     client_handle_t	handle;
     int			state;
     user_info_t		*user;
@@ -105,9 +108,11 @@
     wait_queue_head_t	queue, request;
     struct timer_list	removal;
     socket_bind_t	*bind;
-} socket_info_t;
+};
 
-#define SOCKET_PRESENT		0x01
+#ifndef SOCKET_PRESENT
+#define SOCKET_PRESENT		0x08
+#endif
 #define SOCKET_BUSY		0x02
 #define SOCKET_REMOVAL_PENDING	0x10
 
@@ -116,8 +121,7 @@
 /* Device driver ID passed to Card Services */
 static dev_info_t dev_info = "Driver Services";
 
-static int sockets = 0, major_dev = -1;
-static socket_info_t *socket_table = NULL;
+static int major_dev = -1;
 
 extern struct proc_dir_entry *proc_pccard;
 
@@ -186,15 +190,20 @@
 void pcmcia_unregister_driver(struct pcmcia_driver *driver)
 {
 	socket_bind_t *b;
+	struct ds_socket_info *ds;
 	int i;
 
 	if (driver->use_count > 0) {
 		/* Blank out any left-over device instances */
 		driver->attach = NULL; driver->detach = NULL;
-		for (i = 0; i < sockets; i++)
-			for (b = socket_table[i].bind; b; b = b->next)
+		for (i = 0; i < sockets; i++) {
+			if (!socket_table[i] || !socket_table[i]->ds_info)
+				continue;
+			ds = socket_table[i]->ds_info;
+			for (b = ds->bind; b; b = b->next)
 				if (b->driver == driver) 
 					b->instance = NULL;
+		}
 	}
 	
 	driver_unregister(&driver->drv);
@@ -207,6 +216,7 @@
 			   void (*detach)(dev_link_t *))
 {
 	struct pcmcia_driver *driver;
+	struct ds_socket_info *ds;
 	socket_bind_t *b;
 	int i;
 
@@ -227,16 +237,19 @@
 		return 0;
     
 	/* Instantiate any already-bound devices */
-	for (i = 0; i < sockets; i++)
-		for (b = socket_table[i].bind; b; b = b->next) {
-			if (b->driver != driver) 
+	for (i = 0; i < sockets; i++) {
+		if (!socket_table[i] || !socket_table[i]->ds_info)
+			continue;
+		ds = socket_table[i]->ds_info;
+		for (b = ds->bind; b; b = b->next) {
+			if (b->driver != driver)
 				continue;
 			b->instance = driver->attach();
 			if (b->instance == NULL)
 				printk(KERN_NOTICE "ds: unable to create instance "
 				       "of '%s'!\n", driver->drv.name);
 		}
-
+	}
 	return 0;
 } /* register_pccard_driver */
 
@@ -304,7 +317,7 @@
     user->event[user->event_head] = event;
 }
 
-static void handle_event(socket_info_t *s, event_t event)
+static void handle_event(struct ds_socket_info *s, event_t event)
 {
     user_info_t *user;
     for (user = s->user; user; user = user->next)
@@ -312,7 +325,7 @@
     wake_up_interruptible(&s->queue);
 }
 
-static int handle_request(socket_info_t *s, event_t event)
+static int handle_request(struct ds_socket_info *s, event_t event)
 {
     if (s->req_pending != 0)
 	return CS_IN_USE;
@@ -331,7 +344,9 @@
 
 static void handle_removal(u_long sn)
 {
-    socket_info_t *s = &socket_table[sn];
+    struct ds_socket_info *s = socket_table[sn]->ds_info;
+    if (!s)
+	    return;
     handle_event(s, CS_EVENT_CARD_REMOVAL);
     s->state &= ~SOCKET_REMOVAL_PENDING;
 }
@@ -345,37 +360,39 @@
 static int ds_event(event_t event, int priority,
 		    event_callback_args_t *args)
 {
-    socket_info_t *s;
-    int i;
+	socket_info_t *s;
+	struct ds_socket_info *ds;
 
-    DEBUG(1, "ds: ds_event(0x%06x, %d, 0x%p)\n",
-	  event, priority, args->client_handle);
-    s = args->client_data;
-    i = s - socket_table;
+	DEBUG(1, "ds: ds_event(0x%06x, %d, 0x%p)\n",
+	      event, priority, args->client_handle);
+	s = args->client_data;
+	if (!s || !s->ds_info)
+		return -EINVAL;
+	ds = s->ds_info;
     
-    switch (event) {
+	switch (event) {
 	
     case CS_EVENT_CARD_REMOVAL:
-	s->state &= ~SOCKET_PRESENT;
-	if (!(s->state & SOCKET_REMOVAL_PENDING)) {
-	    s->state |= SOCKET_REMOVAL_PENDING;
-	    init_timer(&s->removal);
-	    s->removal.expires = jiffies + HZ/10;
-	    add_timer(&s->removal);
+	ds->state &= ~SOCKET_PRESENT;
+	if (!(ds->state & SOCKET_REMOVAL_PENDING)) {
+	    ds->state |= SOCKET_REMOVAL_PENDING;
+	    init_timer(&ds->removal);
+	    ds->removal.expires = jiffies + HZ/10;
+	    add_timer(&ds->removal);
 	}
 	break;
 	
     case CS_EVENT_CARD_INSERTION:
-	s->state |= SOCKET_PRESENT;
-	handle_event(s, event);
+	ds->state |= SOCKET_PRESENT;
+	handle_event(ds, event);
 	break;
 
     case CS_EVENT_EJECTION_REQUEST:
-	return handle_request(s, event);
+	return handle_request(ds, event);
 	break;
 	
     default:
-	handle_event(s, event);
+	handle_event(ds, event);
 	break;
     }
 
@@ -422,9 +439,12 @@
     struct pcmcia_driver *driver;
     socket_bind_t *b;
     bind_req_t bind_req;
-    socket_info_t *s = &socket_table[i];
+    struct ds_socket_info *s = socket_table[i]->ds_info;
     int ret;
 
+    if (!s)
+	    return -ENODEV;
+
     DEBUG(2, "bind_request(%d, '%s')\n", i,
 	  (char *)bind_info->dev_info);
     driver = get_pcmcia_driver(&bind_info->dev_info);
@@ -488,10 +508,13 @@
 
 static int get_device_info(int i, bind_info_t *bind_info, int first)
 {
-    socket_info_t *s = &socket_table[i];
+    struct ds_socket_info *s = socket_table[i]->ds_info;
     socket_bind_t *b;
     dev_node_t *node;
 
+    if (!s)
+	    return -ENODEV;
+
 #ifdef CONFIG_CARDBUS
     /*
      * Some unbelievably ugly code to associate the PCI cardbus
@@ -558,7 +581,7 @@
 
 static int unbind_request(int i, bind_info_t *bind_info)
 {
-    socket_info_t *s = &socket_table[i];
+    struct ds_socket_info *s = socket_table[i]->ds_info;
     socket_bind_t **b, *c;
 
     DEBUG(2, "unbind_request(%d, '%s')\n", i,
@@ -592,13 +615,15 @@
 static int ds_open(struct inode *inode, struct file *file)
 {
     socket_t i = minor(inode->i_rdev);
-    socket_info_t *s;
+    struct ds_socket_info *s;
     user_info_t *user;
 
     DEBUG(0, "ds_open(socket %d)\n", i);
     if ((i >= sockets) || (sockets == 0))
 	return -ENODEV;
-    s = &socket_table[i];
+    s = socket_table[i]->ds_info;
+    if (!s)
+	    return -ENODEV;
     if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
 	if (s->state & SOCKET_BUSY)
 	    return -EBUSY;
@@ -624,13 +649,15 @@
 static int ds_release(struct inode *inode, struct file *file)
 {
     socket_t i = minor(inode->i_rdev);
-    socket_info_t *s;
+    struct ds_socket_info *s;
     user_info_t *user, **link;
 
     DEBUG(0, "ds_release(socket %d)\n", i);
     if ((i >= sockets) || (sockets == 0))
 	return 0;
-    s = &socket_table[i];
+    s = socket_table[i]->ds_info;
+    if (!s)
+	    return -ENODEV;
     user = file->private_data;
     if (CHECK_USER(user))
 	goto out;
@@ -656,7 +683,7 @@
 		       size_t count, loff_t *ppos)
 {
     socket_t i = minor(file->f_dentry->d_inode->i_rdev);
-    socket_info_t *s;
+    struct ds_socket_info *s;
     user_info_t *user;
 
     DEBUG(2, "ds_read(socket %d)\n", i);
@@ -665,7 +692,9 @@
 	return -ENODEV;
     if (count < 4)
 	return -EINVAL;
-    s = &socket_table[i];
+    s = socket_table[i]->ds_info;
+    if (!s)
+	    return -ENODEV;
     user = file->private_data;
     if (CHECK_USER(user))
 	return -EIO;
@@ -685,7 +714,7 @@
 			size_t count, loff_t *ppos)
 {
     socket_t i = minor(file->f_dentry->d_inode->i_rdev);
-    socket_info_t *s;
+    struct ds_socket_info *s;
     user_info_t *user;
 
     DEBUG(2, "ds_write(socket %d)\n", i);
@@ -696,7 +725,9 @@
 	return -EINVAL;
     if ((file->f_flags & O_ACCMODE) == O_RDONLY)
 	return -EBADF;
-    s = &socket_table[i];
+    s = socket_table[i]->ds_info;
+    if (!s)
+	    return -ENODEV;
     user = file->private_data;
     if (CHECK_USER(user))
 	return -EIO;
@@ -718,14 +749,16 @@
 static u_int ds_poll(struct file *file, poll_table *wait)
 {
     socket_t i = minor(file->f_dentry->d_inode->i_rdev);
-    socket_info_t *s;
+    struct ds_socket_info *s;
     user_info_t *user;
 
     DEBUG(2, "ds_poll(socket %d)\n", i);
     
     if ((i >= sockets) || (sockets == 0))
 	return POLLERR;
-    s = &socket_table[i];
+    s = socket_table[i]->ds_info;
+    if (!s)
+	    return -ENODEV;
     user = file->private_data;
     if (CHECK_USER(user))
 	return POLLERR;
@@ -741,7 +774,7 @@
 		    u_int cmd, u_long arg)
 {
     socket_t i = minor(inode->i_rdev);
-    socket_info_t *s;
+    struct ds_socket_info *s;
     u_int size;
     int ret, err;
     ds_ioctl_arg_t buf;
@@ -750,7 +783,7 @@
     
     if ((i >= sockets) || (sockets == 0))
 	return -ENODEV;
-    s = &socket_table[i];
+    s = socket_table[i]->ds_info;
     
     size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
     if (size > sizeof(ds_ioctl_arg_t)) return -EINVAL;
@@ -913,6 +946,136 @@
 
 /*====================================================================*/
 
+static int ds_pcmcia_socket_add(socket_info_t *socket)
+{
+	struct ds_socket_info *ds;
+	client_reg_t client_reg;
+	bind_req_t bind;
+	int ret;
+    
+	ds = kmalloc(sizeof(struct ds_socket_info), GFP_KERNEL);
+	if (!ds)
+		return -ENOMEM;
+	memset(ds, 0, sizeof(struct ds_socket_info));
+
+	socket->ds_info = ds;
+
+	init_waitqueue_head(&ds->queue);
+	init_waitqueue_head(&ds->request);
+	init_timer(&ds->removal);
+	ds->removal.data = socket->socket_table_entry;
+	ds->removal.function = &handle_removal;
+
+	bind.Socket = socket->socket_table_entry;
+	bind.Function = BIND_FN_ALL;
+	client_reg.dev_info = bind.dev_info = &dev_info;
+
+	ret = pcmcia_bind_device(&bind);
+	if (ret != CS_SUCCESS) {
+		cs_error(NULL, BindDevice, ret);
+		return -EINVAL;
+	}
+
+	/* Set up hotline to Card Services */
+	client_reg.Attributes = INFO_MASTER_CLIENT;
+	client_reg.EventMask =
+		CS_EVENT_CARD_INSERTION | CS_EVENT_CARD_REMOVAL |
+		CS_EVENT_RESET_PHYSICAL | CS_EVENT_CARD_RESET |
+		CS_EVENT_EJECTION_REQUEST | CS_EVENT_INSERTION_REQUEST |
+		CS_EVENT_PM_SUSPEND | CS_EVENT_PM_RESUME;
+	client_reg.event_handler = &ds_event;
+	client_reg.Version = 0x0210;
+
+	client_reg.event_callback_args.client_data = socket;
+	ret = pcmcia_register_client(&ds->handle,
+			   &client_reg);
+	if (ret != CS_SUCCESS) {
+		cs_error(NULL, RegisterClient, ret);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int ds_pcmcia_socket_remove(socket_info_t *socket)
+{
+	struct ds_socket_info *ds = socket->ds_info;
+	if (ds) {
+		pcmcia_deregister_client(ds->handle);
+		kfree(ds);
+	}
+	return 0;
+}
+
+static struct device_interface ds_interface;
+
+static int ds_pcmcia_s_dev_add(struct device *dev)
+{
+	struct pcmcia_socket_class_data *cls_d = dev->class_data;
+	socket_info_t *s;
+	unsigned int i;
+	unsigned int ret = 0;
+
+	if (!cls_d)
+		return -ENODEV;
+	s = (socket_info_t *) cls_d->s_info;
+	if (!s)
+		return -ENODEV;
+
+        for (i = 0; i < cls_d->nsock; i++) {
+		ds_pcmcia_socket_add(s);
+		s++;
+	}
+	cls_d->ds_intf.dev  = dev;
+	cls_d->ds_intf.intf = &ds_interface;
+	strncpy(cls_d->ds_intf.kobj.name, ds_interface.name, KOBJ_NAME_LEN);
+	cls_d->ds_intf.kobj.parent = &(dev->kobj);
+	cls_d->ds_intf.kobj.kset = &(ds_interface.kset);
+
+        /* add interface */
+        /* currently commented out due to deadlock */
+        //ret = interface_add_data(&(cls_d->ds_intf));
+	if (ret) {
+		s = (socket_info_t *) cls_d->s_info;
+		for (i = 0; i < cls_d->nsock; i++) {
+			ds_pcmcia_socket_remove(s);
+			s++;
+		}		
+	}
+
+	return ret;
+}
+
+static int ds_pcmcia_s_dev_remove(struct intf_data *intf)
+{
+	struct pcmcia_socket_class_data *cls_d = intf->dev->class_data;
+	socket_info_t *s;
+	unsigned int i;
+
+	if (!cls_d)
+		return -ENODEV;
+	s = (socket_info_t *) cls_d->s_info;
+	if (!s)
+		return -ENODEV;
+
+        for (i = 0; i < cls_d->nsock; i++) {
+		ds_pcmcia_socket_remove(s);
+		s++;
+	}
+
+	return 0;
+}
+
+
+static struct device_interface ds_interface = {
+        .name = "pcmcia-bus",
+        .devclass = &pcmcia_socket_class,
+        .add_device = &ds_pcmcia_s_dev_add,
+        .remove_device = &ds_pcmcia_s_dev_remove,
+	.kset = { .subsys = &pcmcia_socket_class.subsys, },
+        .devnum = 0,
+};
+
 struct bus_type pcmcia_bus_type = {
 	.name = "pcmcia",
 };
@@ -924,106 +1087,54 @@
 	return 0;
 }
 
-int __init init_pcmcia_ds(void)
+static int __init init_pcmcia_ds(void)
 {
-    client_reg_t client_reg;
-    servinfo_t serv;
-    bind_req_t bind;
-    socket_info_t *s;
-    int i, ret;
+	servinfo_t serv;
+	int i;
     
-    DEBUG(0, "%s\n", version);
- 
-    /*
-     * Ugly. But we want to wait for the socket threads to have started up.
-     * We really should let the drivers themselves drive some of this..
-     */
-    current->state = TASK_INTERRUPTIBLE;
-    schedule_timeout(HZ/4);
+	DEBUG(0, "%s\n", version);
 
-    pcmcia_get_card_services_info(&serv);
-    if (serv.Revision != CS_RELEASE_CODE) {
-	printk(KERN_NOTICE "ds: Card Services release does not match!\n");
-	return -1;
-    }
-    if (serv.Count == 0) {
-	printk(KERN_NOTICE "ds: no socket drivers loaded!\n");
-	return -1;
-    }
-    
-    sockets = serv.Count;
-    socket_table = kmalloc(sockets*sizeof(socket_info_t), GFP_KERNEL);
-    if (!socket_table) return -1;
-    for (i = 0, s = socket_table; i < sockets; i++, s++) {
-	s->state = 0;
-	s->user = NULL;
-	s->req_pending = 0;
-	init_waitqueue_head(&s->queue);
-	init_waitqueue_head(&s->request);
-	s->handle = NULL;
-	init_timer(&s->removal);
-	s->removal.data = i;
-	s->removal.function = &handle_removal;
-	s->bind = NULL;
-    }
-    
-    /* Set up hotline to Card Services */
-    client_reg.dev_info = bind.dev_info = &dev_info;
-    client_reg.Attributes = INFO_MASTER_CLIENT;
-    client_reg.EventMask =
-	CS_EVENT_CARD_INSERTION | CS_EVENT_CARD_REMOVAL |
-	CS_EVENT_RESET_PHYSICAL | CS_EVENT_CARD_RESET |
-	CS_EVENT_EJECTION_REQUEST | CS_EVENT_INSERTION_REQUEST |
-        CS_EVENT_PM_SUSPEND | CS_EVENT_PM_RESUME;
-    client_reg.event_handler = &ds_event;
-    client_reg.Version = 0x0210;
-    for (i = 0; i < sockets; i++) {
-	bind.Socket = i;
-	bind.Function = BIND_FN_ALL;
-	ret = pcmcia_bind_device(&bind);
-	if (ret != CS_SUCCESS) {
-	    cs_error(NULL, BindDevice, ret);
-	    break;
-	}
-	client_reg.event_callback_args.client_data = &socket_table[i];
-	ret = pcmcia_register_client(&socket_table[i].handle,
-			   &client_reg);
-	if (ret != CS_SUCCESS) {
-	    cs_error(NULL, RegisterClient, ret);
-	    break;
+	/*
+	 * Ugly. But we want to wait for the socket threads to have started up.
+	 * We really should let the drivers themselves drive some of this..
+	 */
+	current->state = TASK_INTERRUPTIBLE;
+	schedule_timeout(HZ/4);
+	
+	pcmcia_get_card_services_info(&serv);
+	if (serv.Revision != CS_RELEASE_CODE) {
+		printk(KERN_NOTICE "ds: Card Services release does not match!\n");
+		return -1;
 	}
-    }
-    
-    /* Set up character device for user mode clients */
-    i = register_chrdev(0, "pcmcia", &ds_fops);
-    if (i == -EBUSY)
-	printk(KERN_NOTICE "unable to find a free device # for "
+
+        interface_register(&ds_interface);
+
+	/* Set up character device for user mode clients */
+	i = register_chrdev(0, "pcmcia", &ds_fops);
+	if (i == -EBUSY)
+		printk(KERN_NOTICE "unable to find a free device # for "
 	       "Driver Services\n");
-    else
-	major_dev = i;
+	else
+		major_dev = i;
 
 #ifdef CONFIG_PROC_FS
-    if (proc_pccard)
-	create_proc_read_entry("drivers",0,proc_pccard,proc_read_drivers,NULL);
-    init_status = 0;
+	if (proc_pccard)
+		create_proc_read_entry("drivers",0,proc_pccard,proc_read_drivers,NULL);
+	init_status = 0;
 #endif
-    return 0;
+	return 0;
 }
 
 static void __exit exit_pcmcia_ds(void)
 {
-    int i;
 #ifdef CONFIG_PROC_FS
-    if (proc_pccard)
-	remove_proc_entry("drivers", proc_pccard);
+	if (proc_pccard)
+		remove_proc_entry("drivers", proc_pccard);
 #endif
-    if (major_dev != -1)
-	unregister_chrdev(major_dev, "pcmcia");
-    for (i = 0; i < sockets; i++)
-	pcmcia_deregister_client(socket_table[i].handle);
-    sockets = 0;
-    kfree(socket_table);
-    bus_unregister(&pcmcia_bus_type);
+	if (major_dev != -1)
+		unregister_chrdev(major_dev, "pcmcia");
+        interface_unregister(&ds_interface);
+	bus_unregister(&pcmcia_bus_type);
 }
 
 #ifdef MODULE
diff -ru linux-original/include/pcmcia/ss.h linux/include/pcmcia/ss.h
--- linux-original/include/pcmcia/ss.h	2003-02-26 16:38:11.000000000 +0100
+++ linux/include/pcmcia/ss.h	2003-02-26 16:49:33.000000000 +0100
@@ -152,6 +152,7 @@
 	struct pccard_operations *ops;		/* see above */
 	void *s_info;				/* socket_info_t */
 	unsigned int use_bus_pm;
+	struct intf_data ds_intf;		/* intf data for driver services */
 };
 
 extern struct device_class pcmcia_socket_class;
-
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