openwrt-xburst/openwrt/target/linux/linux-2.6/patches/generic/000-reenable_devfs.patch

diff -ur linux-2.6.15-rc5/drivers/mtd/mtd_blkdevs.c linux-2.6.15-rc5-openwrt/drivers/mtd/mtd_blkdevs.c
--- linux-2.6.15-rc5/drivers/mtd/mtd_blkdevs.c	2005-12-04 06:10:42.000000000 +0100
+++ linux-2.6.15-rc5-openwrt/drivers/mtd/mtd_blkdevs.c	2005-12-15 07:53:20.000000000 +0100
@@ -21,6 +21,9 @@
 #include <linux/init.h>
 #include <asm/semaphore.h>
 #include <asm/uaccess.h>
+#ifdef CONFIG_DEVFS_FS
+#include <linux/devfs_fs_kernel.h>
+#endif
 
 static LIST_HEAD(blktrans_majors);
 
@@ -302,6 +305,11 @@
 		snprintf(gd->disk_name, sizeof(gd->disk_name),
 			 "%s%d", tr->name, new->devnum);
 
+#ifdef CONFIG_DEVFS_FS
+		snprintf(gd->devfs_name, sizeof(gd->devfs_name),
+			 "%s/%c", tr->name, (tr->part_bits?'a':'0') + new->devnum);
+#endif
+
 	/* 2.5 has capacity in units of 512 bytes while still
 	   having BLOCK_SIZE_BITS set to 10. Just to keep us amused. */
 	set_capacity(gd, (new->size * new->blksize) >> 9);
@@ -418,6 +426,10 @@
 		return ret;
 	}
 
+#ifdef CONFIG_DEVFS_FS
+	devfs_mk_dir(tr->name);
+#endif
+
 	INIT_LIST_HEAD(&tr->devs);
 	list_add(&tr->list, &blktrans_majors);
 
@@ -450,6 +462,10 @@
 		tr->remove_dev(dev);
 	}
 
+#ifdef CONFIG_DEVFS_FS
+	devfs_remove(tr->name);
+#endif
+
 	blk_cleanup_queue(tr->blkcore_priv->rq);
 	unregister_blkdev(tr->major, tr->name);
 
diff -ur linux-2.6.15-rc5/drivers/mtd/mtdchar.c linux-2.6.15-rc5-openwrt/drivers/mtd/mtdchar.c
--- linux-2.6.15-rc5/drivers/mtd/mtdchar.c	2005-12-04 06:10:42.000000000 +0100
+++ linux-2.6.15-rc5-openwrt/drivers/mtd/mtdchar.c	2005-12-15 07:49:15.000000000 +0100
@@ -6,7 +6,6 @@
  */
 
 #include <linux/config.h>
-#include <linux/device.h>
 #include <linux/fs.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
@@ -19,19 +18,33 @@
 
 #include <asm/uaccess.h>
 
+#ifdef CONFIG_DEVFS_FS
+#include <linux/devfs_fs_kernel.h>
+#else
+#include <linux/device.h>
+
 static struct class *mtd_class;
+#endif
 
 static void mtd_notify_add(struct mtd_info* mtd)
 {
 	if (!mtd)
 		return;
 
+#ifdef CONFIG_DEVFS_FS
+	devfs_mk_cdev(MKDEV(MTD_CHAR_MAJOR, mtd->index*2),
+			S_IFCHR | S_IRUGO | S_IWUGO, "mtd/%d", mtd->index);
+
+	devfs_mk_cdev(MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1),
+			S_IFCHR | S_IRUGO, "mtd/%dro", mtd->index);
+#else
 	class_device_create(mtd_class, NULL, MKDEV(MTD_CHAR_MAJOR, mtd->index*2),
 			    NULL, "mtd%d", mtd->index);
 
 	class_device_create(mtd_class, NULL,
 			    MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1),
 			    NULL, "mtd%dro", mtd->index);
+#endif
 }
 
 static void mtd_notify_remove(struct mtd_info* mtd)
@@ -39,8 +52,13 @@
 	if (!mtd)
 		return;
 
+#ifdef CONFIG_DEVFS_FS
+	devfs_remove("mtd/%d", mtd->index);
+	devfs_remove("mtd/%dro", mtd->index);
+#else
 	class_device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2));
 	class_device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1));
+#endif
 }
 
 static struct mtd_notifier notifier = {
@@ -48,6 +66,22 @@
 	.remove	= mtd_notify_remove,
 };
 
+#ifdef CONFIG_DEVFS_FS
+	static inline void mtdchar_devfs_init(void)
+	{
+		devfs_mk_dir("mtd");
+		register_mtd_user(&notifier);
+	}
+	static inline void mtdchar_devfs_exit(void)
+	{
+		unregister_mtd_user(&notifier);
+		devfs_remove("mtd");
+	}
+	#else /* !DEVFS */
+	#define mtdchar_devfs_init() do { } while(0)
+	#define mtdchar_devfs_exit() do { } while(0)
+#endif
+
 /*
  * We use file->private_data to store a pointer to the MTDdevice.
  * Since alighment is at least 32 bits, we have 2 bits free for OTP
@@ -643,6 +677,9 @@
 		return -EAGAIN;
 	}
 
+#ifdef CONFIG_DEVFS_FS
+	mtdchar_devfs_init();
+#else
 	mtd_class = class_create(THIS_MODULE, "mtd");
 
 	if (IS_ERR(mtd_class)) {
@@ -652,13 +689,19 @@
 	}
 
 	register_mtd_user(&notifier);
+#endif
 	return 0;
 }
 
 static void __exit cleanup_mtdchar(void)
 {
+
+#ifdef CONFIG_DEVFS_FS
+	mtdchar_devfs_exit();
+#else
 	unregister_mtd_user(&notifier);
 	class_destroy(mtd_class);
+#endif
 	unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
 }
 
diff -ur linux-2.6.15-rc5/fs/Kconfig linux-2.6.15-rc5-openwrt/fs/Kconfig
--- linux-2.6.15-rc5/fs/Kconfig	2005-12-04 06:10:42.000000000 +0100
+++ linux-2.6.15-rc5-openwrt/fs/Kconfig	2005-12-15 07:44:01.000000000 +0100
@@ -772,6 +772,56 @@
         help
         Exports the dump image of crashed kernel in ELF format.
 
+config DEVFS_FS
+	bool "/dev file system support (OBSOLETE)"
+	depends on EXPERIMENTAL
+	help
+	  This is support for devfs, a virtual file system (like /proc) which
+	  provides the file system interface to device drivers, normally found
+	  in /dev. Devfs does not depend on major and minor number
+	  allocations. Device drivers register entries in /dev which then
+	  appear automatically, which means that the system administrator does
+	  not have to create character and block special device files in the
+	  /dev directory using the mknod command (or MAKEDEV script) anymore.
+
+	  This is work in progress. If you want to use this, you *must* read
+	  the material in <file:Documentation/filesystems/devfs/>, especially
+	  the file README there.
+
+	  Note that devfs no longer manages /dev/pts!  If you are using UNIX98
+	  ptys, you will also need to mount the /dev/pts filesystem (devpts).
+
+	  Note that devfs has been obsoleted by udev,
+	  <http://www.kernel.org/pub/linux/utils/kernel/hotplug/>.
+	  It has been stripped down to a bare minimum and is only provided for
+	  legacy installations that use its naming scheme which is
+	  unfortunately different from the names normal Linux installations
+	  use.
+
+	  If unsure, say N.
+
+config DEVFS_MOUNT
+	bool "Automatically mount at boot"
+	depends on DEVFS_FS
+	help
+	  This option appears if you have CONFIG_DEVFS_FS enabled. Setting
+	  this to 'Y' will make the kernel automatically mount devfs onto /dev
+	  when the system is booted, before the init thread is started.
+	  You can override this with the "devfs=nomount" boot option.
+
+	  If unsure, say N.
+
+config DEVFS_DEBUG
+	bool "Debug devfs"
+	depends on DEVFS_FS
+	help
+	  If you say Y here, then the /dev file system code will generate
+	  debugging messages. See the file
+	  <file:Documentation/filesystems/devfs/boot-options> for more
+	  details.
+
+	  If unsure, say N.
+
 config SYSFS
 	bool "sysfs file system support" if EMBEDDED
 	default y