[PATCH] expose sysfs functions for sharing it

This patch exposes the wait_for_sysfs functions to all possible users,
so we need to maintain only one list of exceptions. The last list is
hereby removed from udev.c.

5 files changed, 437 insertions, 372 deletions

diff --git a/Makefile b/Makefile
index d0633b70..4d25aee7 100644
--- a/Makefile
+++ b/Makefile
@@ -212,6 +212,7 @@ OBJS =	udev_lib.o	\
 	udev_config.o	\
 	udev_add.o	\
 	udev_remove.o	\
+	udev_sysfs.o	\
 	udevdb.o	\
 	namedev.o	\
 	namedev_parse.o	\
@@ -224,6 +225,7 @@ HEADERS =	udev.h		\
 		namedev.h	\
 		udev_version.h	\
 		udevdb.h	\
+		udev_sysfs.h	\
 		klibc_fixups.h	\
 		logging.h	\
 		selinux.h	\
@@ -303,7 +305,7 @@ $(SENDER): $(LIBC) $(SENDER).o $(OBJS) udevd.h
 	$(QUIET) $(STRIPCMD) $@
 
 $(WAIT): $(WAIT).o $(OBJS) $(HEADERS) $(LIBC)
-	$(QUIET) $(LD) $(LDFLAGS) -o $@ $(CRT0) $(WAIT).o $(SYSFS) $(LIB_OBJS) $(ARCH_LIB_OBJS)
+	$(QUIET) $(LD) $(LDFLAGS) -o $@ $(CRT0) $(WAIT).o udev_sysfs.o udev_lib.o udev_config.o $(SYSFS) $(LIB_OBJS) $(ARCH_LIB_OBJS)
 	$(QUIET) $(STRIPCMD) $@
 
 #.c.o:
diff --git a/udev.c b/udev.c
index 839bfa65..5064bbd1 100644
--- a/udev.c
+++ b/udev.c
@@ -33,6 +33,7 @@
 #include "libsysfs/sysfs/libsysfs.h"
 #include "udev.h"
 #include "udev_lib.h"
+#include "udev_sysfs.h"
 #include "udev_version.h"
 #include "logging.h"
 #include "namedev.h"
@@ -76,35 +77,6 @@ static void asmlinkage sig_handler(int signum)
 	}
 }
 
-/* list of subsystems we don't care about. not listing such systems here
- * is not critical, but it makes it faster as we don't look for the "dev" file
- */
-static int subsystem_without_dev(const char *subsystem)
-{
-	char *subsystem_blacklist[] = {
-		"scsi_host",
-		"scsi_device",
-		"usb_host",
-		"pci_bus",
-		"pcmcia_socket",
-		"bluetooth",
-		"i2c-adapter",
-		"pci_bus",
-		"ieee1394",
-		"ieee1394_host",
-		"ieee1394_node",
-		NULL
-	};
-	char **subsys;
-
-	for (subsys = subsystem_blacklist; *subsys != NULL; subsys++) {
-		if (strcmp(subsystem, *subsys) == 0)
-			return 1;
-	}
-
-	return 0;
-}
-
 int main(int argc, char *argv[], char *envp[])
 {
 	struct sigaction act;
@@ -151,7 +123,7 @@ int main(int argc, char *argv[], char *envp[])
 			dbg("no devpath?");
 			goto exit;
 		}
-		dbg("looking at '%s'", udev.devpath);
+		dbg("looking at '%s'", devpath);
 
 		/* we only care about class devices and block stuff */
 		if (!strstr(devpath, "class") && !strstr(devpath, "block")) {
@@ -164,13 +136,14 @@ int main(int argc, char *argv[], char *envp[])
 			goto exit;
 		}
 
+		udev_set_values(&udev, devpath, subsystem);
+
 		/* skip blacklisted subsystems */
-		if (subsystem_without_dev(subsystem)) {
+		if (udev.type != 'n' && subsystem_expect_no_dev(subsystem)) {
 			dbg("don't care about '%s' devices", subsystem);
 			goto exit;
 		};
 
-		udev_set_values(&udev, devpath, subsystem);
 	}
 
 	/* set signal handlers */
@@ -197,9 +170,6 @@ int main(int argc, char *argv[], char *envp[])
 	case ADD:
 		dbg("udev add");
 
-		/* init rules */
-		namedev_init();
-
 		/* open the device */
 		snprintf(path, SYSFS_PATH_MAX, "%s%s", sysfs_path, udev.devpath);
 		class_dev = sysfs_open_class_device_path(path);
@@ -209,6 +179,9 @@ int main(int argc, char *argv[], char *envp[])
 		}
 		dbg("opened class_dev->name='%s'", class_dev->name);
 
+		/* init rules */
+		namedev_init();
+
 		/* name, create node, store in db */
 		retval = udev_add_device(&udev, class_dev);
 
diff --git a/udev_sysfs.c b/udev_sysfs.c
new file mode 100644
index 00000000..624f5358
--- /dev/null
+++ b/udev_sysfs.c
@@ -0,0 +1,387 @@
+/*
+ * udev_sysfs.c  - sysfs linux kernel specific knowledge
+ *
+ * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
+ * Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
+ *
+ *	This program is free software; you can redistribute it and/or modify it
+ *	under the terms of the GNU General Public License as published by the
+ *	Free Software Foundation version 2 of the License.
+ * 
+ *	This program is distributed in the hope that it will be useful, but
+ *	WITHOUT ANY WARRANTY; without even the implied warranty of
+ *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *	General Public License for more details.
+ * 
+ *	You should have received a copy of the GNU General Public License along
+ *	with this program; if not, write to the Free Software Foundation, Inc.,
+ *	675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <stdio.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <ctype.h>
+#include <errno.h>
+#include <sys/stat.h>
+
+#include "logging.h"
+#include "udev_version.h"
+#include "udev_sysfs.h"
+#include "libsysfs/sysfs/libsysfs.h"
+
+/* list of subsystem specific files
+ * NULL if there is no file to wait for
+ */
+static struct subsystem_file {
+	char *subsystem;
+	char *file;
+} subsystem_files[] = {
+	{ .subsystem = "net",		.file = "ifindex" },
+	{ .subsystem = "scsi_host",	.file = "unique_id" },
+	{ .subsystem = "scsi_device",	.file = NULL },
+	{ .subsystem = "pcmcia_socket",	.file = "card_type" },
+	{ .subsystem = "usb_host",	.file = NULL },
+	{ .subsystem = "bluetooth",	.file = "address" },
+	{ .subsystem = "firmware",	.file = "data" },
+	{ .subsystem = "i2c-adapter",	.file = NULL },
+	{ .subsystem = "pci_bus",	.file = NULL },
+	{ .subsystem = "ieee1394",	.file = NULL },
+	{ .subsystem = "ieee1394_host",	.file = NULL },
+	{ .subsystem = "ieee1394_node",	.file = NULL },
+	{ NULL, NULL }
+};
+
+int subsystem_expect_no_dev(const char *subsystem)
+{
+	struct subsystem_file *file;
+
+	for (file = subsystem_files; file->subsystem != NULL; file++)
+		if (strcmp(subsystem, file->subsystem) == 0)
+			return 1;
+
+	return 0;
+}
+
+/* get subsystem specific files, returns "dev" if no other found */
+static char *get_subsystem_specific_file(const char *subsystem)
+{
+	struct subsystem_file *file;
+
+	/* look if we want to look for another file instead of "dev" */
+	for (file = subsystem_files; file->subsystem != NULL; file++)
+		if (strcmp(subsystem, file->subsystem) == 0)
+			return file->file;
+
+	return "dev";
+}
+
+/* wait for class pecific file to show up */
+static int wait_for_class_device_attributes(struct sysfs_class_device *class_dev,
+					    const char **error)
+{
+	const char *file;
+	char filename[SYSFS_PATH_MAX];
+	int loop;
+
+	file = get_subsystem_specific_file(class_dev->classname);
+	if (file == NULL) {
+		dbg("class '%s' has no file to wait for", class_dev->classname);
+		return 0;
+	}
+
+	strcpy(filename, class_dev->path);
+	strcat(filename, "/");
+	strcat(filename, file);
+	dbg("looking at class '%s' for specific file '%s' with full name %s", class_dev->classname, file, filename);
+
+	loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
+	while (--loop) {
+		struct stat stats;
+
+		if (stat(class_dev->path, &stats) == -1) {
+			dbg("'%s' now disappeared (probably remove has beaten us)", class_dev->path);
+			return -ENODEV;
+		}
+
+		if (stat(filename, &stats) == 0) {
+			dbg("class '%s' specific file '%s' found", class_dev->classname, file);
+			return 0;
+		}
+
+		usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
+	}
+
+	dbg("error: getting class '%s' specific file '%s'", class_dev->classname, file);
+	if (error)
+		*error = "class specific file unavailable";
+	return -ENOENT;
+}
+
+/* check if we need to wait for a physical device */
+static int class_device_expect_no_device_link(struct sysfs_class_device *class_dev)
+{
+	/* list of devices without a "device" symlink to the physical device
+	 * if device is set to NULL, no devices in that subsystem has a link */
+	static struct class_device {
+		char *subsystem;
+		char *device;
+	} class_device[] = {
+		{ .subsystem = "block",		.device = "double" },
+		{ .subsystem = "block",		.device = "nb" },
+		{ .subsystem = "block",		.device = "ram" },
+		{ .subsystem = "block",		.device = "loop" },
+		{ .subsystem = "block",		.device = "fd" },
+		{ .subsystem = "block",		.device = "md" },
+		{ .subsystem = "block",		.device = "dos_cd" },
+		{ .subsystem = "block",		.device = "rflash" },
+		{ .subsystem = "block",		.device = "rom" },
+		{ .subsystem = "block",		.device = "rrom" },
+		{ .subsystem = "block",		.device = "flash" },
+		{ .subsystem = "block",		.device = "msd" },
+		{ .subsystem = "block",		.device = "sbpcd" },
+		{ .subsystem = "block",		.device = "pcd" },
+		{ .subsystem = "block",		.device = "pf" },
+		{ .subsystem = "block",		.device = "scd" },
+		{ .subsystem = "block",		.device = "ubd" },
+		{ .subsystem = "block",		.device = "dm-" },
+		{ .subsystem = "input",		.device = "event" },
+		{ .subsystem = "input",		.device = "mice" },
+		{ .subsystem = "input",		.device = "mouse" },
+		{ .subsystem = "input",		.device = "ts" },
+		{ .subsystem = "vc",		.device = NULL },
+		{ .subsystem = "tty",		.device = NULL },
+		{ .subsystem = "cpuid",		.device = "cpu" },
+		{ .subsystem = "graphics",	.device = "fb" },
+		{ .subsystem = "mem",		.device = NULL },
+		{ .subsystem = "misc",		.device = NULL },
+		{ .subsystem = "msr",		.device = NULL },
+		{ .subsystem = "netlink",	.device = NULL },
+		{ .subsystem = "net",		.device = "sit" },
+		{ .subsystem = "net",		.device = "lo" },
+		{ .subsystem = "net",		.device = "tap" },
+		{ .subsystem = "net",		.device = "ipsec" },
+		{ .subsystem = "net",		.device = "dummy" },
+		{ .subsystem = "net",		.device = "irda" },
+		{ .subsystem = "net",		.device = "ppp" },
+		{ .subsystem = "ppp",		.device = NULL },
+		{ .subsystem = "sound",		.device = NULL },
+		{ .subsystem = "printer",	.device = "lp" },
+		{ .subsystem = "nvidia",	.device = NULL },
+		{ .subsystem = "video4linux",	.device = "vbi" },
+		{ .subsystem = "lirc",		.device = NULL },
+		{ .subsystem = "firmware",	.device = NULL },
+		{ .subsystem = "drm",		.device = NULL },
+		{ .subsystem = "pci_bus",	.device = NULL },
+		{ .subsystem = "ieee1394",	.device = NULL },
+		{ .subsystem = "ieee1394_host",	.device = NULL },
+		{ .subsystem = "ieee1394_node",	.device = NULL },
+		{ .subsystem = "raw",		.device = NULL },
+		{ NULL, NULL }
+	};
+	struct class_device *classdevice;
+	int len;
+
+	for (classdevice = class_device; classdevice->subsystem != NULL; classdevice++) {
+		if (strcmp(class_dev->classname, classdevice->subsystem) == 0) {
+			/* see if no device in this class is expected to have a device-link */
+			if (classdevice->device == NULL)
+				return 1;
+
+			len = strlen(classdevice->device);
+
+			/* see if device name matches */
+			if (strncmp(class_dev->name, classdevice->device, len) != 0)
+				continue;
+
+			/* exact name match */
+			if (strlen(class_dev->name) == len)
+				return 1;
+
+			/* name match with instance number */
+			if (isdigit(class_dev->name[len]))
+				return 1;
+		}
+	}
+
+	return 0;
+}
+
+/* skip waiting for the bus */
+static int class_device_expect_no_bus(struct sysfs_class_device *class_dev)
+{
+	static char *devices_without_bus[] = {
+		"scsi_host",
+		"i2c-adapter",
+		NULL
+	};
+	char **device;
+
+	for (device = devices_without_bus; *device != NULL; device++) {
+		int len = strlen(*device);
+
+		if (strncmp(class_dev->classname, *device, len) == 0)
+			return 1;
+	}
+
+	return 0;
+}
+
+/* wait for the bus and for a bus specific file to show up */
+int wait_for_bus_device(struct sysfs_device *devices_dev,
+			const char **error)
+{
+	static struct bus_file {
+		char *bus;
+		char *file;
+	} bus_files[] = {
+		{ .bus = "scsi",	.file = "vendor" },
+		{ .bus = "usb",		.file = "idVendor" },
+		{ .bus = "usb",		.file = "iInterface" },
+		{ .bus = "usb",		.file = "bNumEndpoints" },
+		{ .bus = "usb-serial",	.file = "detach_state" },
+		{ .bus = "ide",		.file = "detach_state" },
+		{ .bus = "pci",		.file = "vendor" },
+		{ .bus = "platform",	.file = "detach_state" },
+		{ .bus = "i2c",		.file = "detach_state" },
+		{ NULL }
+	};
+	struct bus_file *busfile;
+	int loop;
+
+	/* wait for the bus device link to the devices device */
+	loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
+	while (--loop) {
+		if (sysfs_get_device_bus(devices_dev) == 0)
+			break;
+
+		usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
+	}
+	if (loop == 0) {
+		dbg("error: getting bus device link");
+		if (error)
+			*error = "no bus device link";
+		return -1;
+	}
+	dbg("bus device link found for bus '%s'", devices_dev->bus);
+
+	/* wait for a bus specific file to show up */
+	loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
+	while (--loop) {
+		int found = 0;
+
+		for (busfile = bus_files; busfile->bus != NULL; busfile++) {
+			if (strcmp(devices_dev->bus, busfile->bus) == 0) {
+				found = 1;
+				dbg("looking at bus '%s' for specific file '%s'", devices_dev->bus, busfile->file);
+				if (sysfs_get_device_attr(devices_dev, busfile->file) != NULL) {
+					dbg("bus '%s' specific file '%s' found", devices_dev->bus, busfile->file);
+					return 0;
+				}
+			}
+		}
+		if (found == 0) {
+			if (error)
+				*error = "unknown bus";
+			info("error: unknown bus, please report to "
+			     "<linux-hotplug-devel@lists.sourceforge.net> '%s'", devices_dev->bus);
+			return -1;
+		}
+		usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
+	}
+
+	dbg("error: getting bus '%s' specific file '%s'", devices_dev->bus, busfile->file);
+	if (error)
+		*error = "bus specific file unavailable";
+	return -1;
+}
+
+
+struct sysfs_class_device *open_class_device_wait(const char *path)
+{
+	struct sysfs_class_device *class_dev;
+	int loop;
+
+	loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
+	while (--loop) {
+		class_dev = sysfs_open_class_device_path(path);
+		if (class_dev)
+			break;
+
+		usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
+	}
+
+	return (class_dev);
+}
+
+int wait_for_class_device(struct sysfs_class_device *class_dev,
+			  const char **error)
+{
+	struct sysfs_class_device *class_dev_parent;
+	struct sysfs_device *devices_dev = NULL;
+	int loop;
+
+	if (wait_for_class_device_attributes(class_dev, error) != 0)
+		return -ENOENT;
+
+	/* skip devices without devices-link */
+	if (class_device_expect_no_device_link(class_dev)) {
+		dbg("no device symlink expected for '%s', ", class_dev->name);
+		return -ENODEV;
+	}
+
+	/* the symlink may be on the parent device */
+	class_dev_parent = sysfs_get_classdev_parent(class_dev);
+	if (class_dev_parent)
+		dbg("looking at parent device for device link '%s'", class_dev_parent->path);
+
+	/* wait for the symlink to the devices device */
+	dbg("waiting for symlink to devices device");
+	loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
+	while (--loop) {
+		if (class_dev_parent)
+			devices_dev = sysfs_get_classdev_device(class_dev_parent);
+		else
+			devices_dev = sysfs_get_classdev_device(class_dev);
+
+		if (devices_dev)
+			break;
+
+		usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
+	}
+	if (!devices_dev) {
+		dbg(" error: no devices device symlink found");
+		if (error)
+			*error = "no device symlink";
+		return -ENODEV;
+	}
+	dbg("device symlink found pointing to '%s'", devices_dev->path);
+
+	/* wait for the bus value */
+	if (class_device_expect_no_bus(class_dev)) {
+		dbg("no bus device expected for '%s', ", class_dev->classname);
+		return 0;
+	} else {
+		return wait_for_bus_device(devices_dev, error);
+	}
+}
+
+struct sysfs_device *open_devices_device_wait(const char *path)
+{
+	struct sysfs_device *devices_dev;
+	int loop;
+
+	loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
+	while (--loop) {
+		devices_dev = sysfs_open_device_path(path);
+		if (devices_dev)
+			break;
+
+		usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
+	}
+
+	return(devices_dev);
+}
diff --git a/udev_sysfs.h b/udev_sysfs.h
new file mode 100644
index 00000000..922db1be
--- /dev/null
+++ b/udev_sysfs.h
@@ -0,0 +1,36 @@
+/*
+ * udev_sysfs.h
+ *
+ * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
+ * Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
+ *
+ *	This program is free software; you can redistribute it and/or modify it
+ *	under the terms of the GNU General Public License as published by the
+ *	Free Software Foundation version 2 of the License.
+ * 
+ *	This program is distributed in the hope that it will be useful, but
+ *	WITHOUT ANY WARRANTY; without even the implied warranty of
+ *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *	General Public License for more details.
+ * 
+ *	You should have received a copy of the GNU General Public License along
+ *	with this program; if not, write to the Free Software Foundation, Inc.,
+ *	675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#ifndef _UDEV_SYSFS_H_
+#define _UDEV_SYSFS_H_
+
+#include "libsysfs/sysfs/libsysfs.h"
+
+#define WAIT_MAX_SECONDS		5
+#define WAIT_LOOP_PER_SECOND		20
+
+extern int subsystem_expect_no_dev(const char *subsystem);
+extern int wait_for_bus_device(struct sysfs_device *devices_dev, const char **error);
+extern int wait_for_class_device(struct sysfs_class_device *class_dev, const char **error);
+extern struct sysfs_class_device *open_class_device_wait(const char *path);
+extern struct sysfs_device *open_devices_device_wait(const char *path);
+
+#endif /* _UDEV_SYSFS_H_ */
diff --git a/wait_for_sysfs.c b/wait_for_sysfs.c
index 45f84606..e7eed441 100644
--- a/wait_for_sysfs.c
+++ b/wait_for_sysfs.c
@@ -34,12 +34,9 @@
 
 #include "logging.h"
 #include "udev_version.h"
+#include "udev_sysfs.h"
 #include "libsysfs/sysfs/libsysfs.h"
 
-#ifndef FILENAME_MAX
-#define FILENAME_MAX	4096
-#endif
-
 #ifdef LOG
 unsigned char logname[LOGNAME_SIZE];
 void log_message(int level, const char *format, ...)
@@ -52,336 +49,6 @@ void log_message(int level, const char *format, ...)
 }
 #endif
 
-#define WAIT_MAX_SECONDS		5
-#define WAIT_LOOP_PER_SECOND		20
-
-/* wait for specific file to show up, normally the "dev"-file */
-static int wait_for_class_device_attributes(struct sysfs_class_device *class_dev,
-					    const char **error)
-{
-	static struct class_file {
-		char *subsystem;
-		char *file;
-	} class_files[] = {
-		{ .subsystem = "net",		.file = "ifindex" },
-		{ .subsystem = "scsi_host",	.file = "unique_id" },
-		{ .subsystem = "scsi_device",	.file = NULL },
-		{ .subsystem = "pcmcia_socket",	.file = "card_type" },
-		{ .subsystem = "usb_host",	.file = NULL },
-		{ .subsystem = "bluetooth",	.file = "address" },
-		{ .subsystem = "firmware",	.file = "data" },
-		{ .subsystem = "i2c-adapter",	.file = NULL },
-		{ .subsystem = "pci_bus",	.file = NULL },
-		{ .subsystem = "ieee1394",	.file = NULL },
-		{ .subsystem = "ieee1394_host",	.file = NULL },
-		{ .subsystem = "ieee1394_node",	.file = NULL },
-		{ NULL, NULL }
-	};
-	struct class_file *classfile;
-	char *file = "dev";
-	char filename[FILENAME_MAX];
-	int loop;
-
-	/* look if we want to look for another file instead of "dev" */
-	for (classfile = class_files; classfile->subsystem != NULL; classfile++) {
-		if (strcmp(class_dev->classname, classfile->subsystem) == 0) {
-			if (classfile->file == NULL) {
-				dbg("class '%s' has no file to wait for", class_dev->classname);
-				return 0;
-			}
-			file = classfile->file;
-			break;
-		}
-	}
-
-	strcpy(filename, class_dev->path);
-	strcat(filename, "/");
-	strcat(filename, file);
-	dbg("looking at class '%s' for specific file '%s' with full name %s", class_dev->classname, class_dev->path, filename);
-
-	loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
-	while (--loop) {
-		struct stat stats;
-
-		if (stat(class_dev->path, &stats) == -1) {
-			dbg("'%s' now disappeared (probably remove has beaten us)", class_dev->path);
-			return -ENODEV;
-		}
-
-		if (stat(filename, &stats) == 0) {
-			dbg("class '%s' specific file '%s' found", class_dev->classname, file);
-			return 0;
-		}
-
-		usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
-	}
-
-	dbg("error: getting class '%s' specific file '%s'", class_dev->classname, file);
-	*error = "class specific file unavailable";
-	return -ENOENT;
-}
-
-/* check if we need to wait for a physical device */
-static int class_device_expect_no_device_link(struct sysfs_class_device *class_dev)
-{
-	/* list of devices without a "device" symlink to the physical device
-	 * if device is set to NULL, no devices in that subsystem has a link */
-	static struct class_device {
-		char *subsystem;
-		char *device;
-	} class_device[] = {
-		{ .subsystem = "block",		.device = "double" },
-		{ .subsystem = "block",		.device = "nb" },
-		{ .subsystem = "block",		.device = "ram" },
-		{ .subsystem = "block",		.device = "loop" },
-		{ .subsystem = "block",		.device = "fd" },
-		{ .subsystem = "block",		.device = "md" },
-		{ .subsystem = "block",		.device = "dos_cd" },
-		{ .subsystem = "block",		.device = "rflash" },
-		{ .subsystem = "block",		.device = "rom" },
-		{ .subsystem = "block",		.device = "rrom" },
-		{ .subsystem = "block",		.device = "flash" },
-		{ .subsystem = "block",		.device = "msd" },
-		{ .subsystem = "block",		.device = "sbpcd" },
-		{ .subsystem = "block",		.device = "pcd" },
-		{ .subsystem = "block",		.device = "pf" },
-		{ .subsystem = "block",		.device = "scd" },
-		{ .subsystem = "block",		.device = "ubd" },
-		{ .subsystem = "block",		.device = "dm-" },
-		{ .subsystem = "input",		.device = "event" },
-		{ .subsystem = "input",		.device = "mice" },
-		{ .subsystem = "input",		.device = "mouse" },
-		{ .subsystem = "input",		.device = "ts" },
-		{ .subsystem = "vc",		.device = NULL },
-		{ .subsystem = "tty",		.device = NULL },
-		{ .subsystem = "cpuid",		.device = "cpu" },
-		{ .subsystem = "graphics",	.device = "fb" },
-		{ .subsystem = "mem",		.device = NULL },
-		{ .subsystem = "misc",		.device = NULL },
-		{ .subsystem = "msr",		.device = NULL },
-		{ .subsystem = "netlink",	.device = NULL },
-		{ .subsystem = "net",		.device = "sit" },
-		{ .subsystem = "net",		.device = "lo" },
-		{ .subsystem = "net",		.device = "tap" },
-		{ .subsystem = "net",		.device = "ipsec" },
-		{ .subsystem = "net",		.device = "dummy" },
-		{ .subsystem = "net",		.device = "irda" },
-		{ .subsystem = "net",		.device = "ppp" },
-		{ .subsystem = "ppp",		.device = NULL },
-		{ .subsystem = "sound",		.device = NULL },
-		{ .subsystem = "printer",	.device = "lp" },
-		{ .subsystem = "nvidia",	.device = NULL },
-		{ .subsystem = "video4linux",	.device = "vbi" },
-		{ .subsystem = "lirc",		.device = NULL },
-		{ .subsystem = "firmware",	.device = NULL },
-		{ .subsystem = "drm",		.device = NULL },
-		{ .subsystem = "pci_bus",	.device = NULL },
-		{ .subsystem = "ieee1394",	.device = NULL },
-		{ .subsystem = "ieee1394_host",	.device = NULL },
-		{ .subsystem = "ieee1394_node",	.device = NULL },
-		{ .subsystem = "raw",		.device = NULL },
-		{ NULL, NULL }
-	};
-	struct class_device *classdevice;
-	int len;
-
-	for (classdevice = class_device; classdevice->subsystem != NULL; classdevice++) {
-		if (strcmp(class_dev->classname, classdevice->subsystem) == 0) {
-			/* see if no device in this class is expected to have a device-link */
-			if (classdevice->device == NULL)
-				return 1;
-
-			len = strlen(classdevice->device);
-
-			/* see if device name matches */
-			if (strncmp(class_dev->name, classdevice->device, len) != 0)
-				continue;
-
-			/* exact name match */
-			if (strlen(class_dev->name) == len)
-				return 1;
-
-			/* name match with instance number */
-			if (isdigit(class_dev->name[len]))
-				return 1;
-		}
-	}
-
-	return 0;
-}
-
-/* skip waiting for the bus */
-static int class_device_expect_no_bus(struct sysfs_class_device *class_dev)
-{
-	static char *devices_without_bus[] = {
-		"scsi_host",
-		"i2c-adapter",
-		NULL
-	};
-	char **device;
-
-	for (device = devices_without_bus; *device != NULL; device++) {
-		int len = strlen(*device);
-
-		if (strncmp(class_dev->classname, *device, len) == 0)
-			return 1;
-	}
-
-	return 0;
-}
-
-/* wait for the bus and for a bus specific file to show up */
-static int wait_for_bus_device(struct sysfs_device *devices_dev,
-			       const char **error)
-{
-	static struct bus_file {
-		char *bus;
-		char *file;
-	} bus_files[] = {
-		{ .bus = "scsi",	.file = "vendor" },
-		{ .bus = "usb",		.file = "idVendor" },
-		{ .bus = "usb",		.file = "iInterface" },
-		{ .bus = "usb",		.file = "bNumEndpoints" },
-		{ .bus = "usb-serial",	.file = "detach_state" },
-		{ .bus = "ide",		.file = "detach_state" },
-		{ .bus = "pci",		.file = "vendor" },
-		{ .bus = "platform",	.file = "detach_state" },
-		{ .bus = "i2c",		.file = "detach_state" },
-		{ NULL }
-	};
-	struct bus_file *busfile;
-	int loop;
-
-	/* wait for the bus device link to the devices device */
-	loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
-	while (--loop) {
-		if (sysfs_get_device_bus(devices_dev) == 0)
-			break;
-
-		usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
-	}
-	if (loop == 0) {
-		dbg("error: getting bus device link");
-		*error = "no bus device link";
-		return -1;
-	}
-	dbg("bus device link found for bus '%s'", devices_dev->bus);
-
-	/* wait for a bus specific file to show up */
-	loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
-	while (--loop) {
-		int found = 0;
-
-		for (busfile = bus_files; busfile->bus != NULL; busfile++) {
-			if (strcmp(devices_dev->bus, busfile->bus) == 0) {
-				found = 1;
-				dbg("looking at bus '%s' for specific file '%s'", devices_dev->bus, busfile->file);
-				if (sysfs_get_device_attr(devices_dev, busfile->file) != NULL) {
-					dbg("bus '%s' specific file '%s' found", devices_dev->bus, busfile->file);
-					return 0;
-				}
-			}
-		}
-		if (found == 0) {
-			*error = "unknown bus";
-			info("error: unknown bus, please report to "
-			     "<linux-hotplug-devel@lists.sourceforge.net> '%s'", devices_dev->bus);
-			return -1;
-		}
-		usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
-	}
-
-	dbg("error: getting bus '%s' specific file '%s'", devices_dev->bus, busfile->file);
-	*error = "bus specific file unavailable";
-	return -1;
-}
-
-
-static struct sysfs_class_device *open_class_device(const char *path)
-{
-	struct sysfs_class_device *class_dev;
-	int loop;
-
-	loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
-	while (--loop) {
-		class_dev = sysfs_open_class_device_path(path);
-		if (class_dev)
-			break;
-
-		usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
-	}
-
-	return (class_dev);
-}
-
-static int wait_for_class_device(struct sysfs_class_device *class_dev,
-				 const char **error)
-{
-	struct sysfs_class_device *class_dev_parent;
-	struct sysfs_device *devices_dev = NULL;
-	int loop;
-
-	if (wait_for_class_device_attributes(class_dev, error) != 0)
-		return -ENOENT;
-
-	/* skip devices without devices-link */
-	if (class_device_expect_no_device_link(class_dev)) {
-		dbg("no device symlink expected for '%s', ", class_dev->name);
-		return -ENODEV;
-	}
-
-	/* the symlink may be on the parent device */
-	class_dev_parent = sysfs_get_classdev_parent(class_dev);
-	if (class_dev_parent)
-		dbg("looking at parent device for device link '%s'", class_dev_parent->path);
-
-	/* wait for the symlink to the devices device */
-	dbg("waiting for symlink to devices device");
-	loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
-	while (--loop) {
-		if (class_dev_parent)
-			devices_dev = sysfs_get_classdev_device(class_dev_parent);
-		else
-			devices_dev = sysfs_get_classdev_device(class_dev);
-
-		if (devices_dev)
-			break;
-
-		usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
-	}
-	if (!devices_dev) {
-		dbg(" error: no devices device symlink found");
-		*error = "no device symlink";
-		return -ENODEV;
-	}
-	dbg("device symlink found pointing to '%s'", devices_dev->path);
-
-	/* wait for the bus value */
-	if (class_device_expect_no_bus(class_dev)) {
-		dbg("no bus device expected for '%s', ", class_dev->classname);
-		return 0;
-	} else {
-		return wait_for_bus_device(devices_dev, error);
-	}
-}
-
-static struct sysfs_device *open_devices_device(const char *path)
-{
-	struct sysfs_device *devices_dev;
-	int loop;
-
-	loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
-	while (--loop) {
-		devices_dev = sysfs_open_device_path(path);
-		if (devices_dev)
-			break;
-
-		usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
-	}
-
-	return(devices_dev);
-}
-
 int main(int argc, char *argv[], char *envp[])
 {
 	const char *devpath = "";
@@ -433,7 +100,7 @@ int main(int argc, char *argv[], char *envp[])
 		filename[SYSFS_PATH_MAX-1] = '\0';
 
 		/* open the class device we are called for */
-		class_dev = open_class_device(filename);
+		class_dev = open_class_device_wait(filename);
 		if (!class_dev) {
 			dbg("error: class device unavailable (probably remove has beaten us)");
 			goto exit;
@@ -450,7 +117,7 @@ int main(int argc, char *argv[], char *envp[])
 		filename[SYSFS_PATH_MAX-1] = '\0';
 
 		/* open the path we are called for */
-		devices_dev = open_devices_device(filename);
+		devices_dev = open_devices_device_wait(filename);
 		if (!devices_dev) {
 			dbg("error: devices device unavailable (probably remove has beaten us)");
 			goto exit;