[PATCH] ide-default driver

This is the first of a set of changes to make DRIVER(drive)!=NULL an
invariant

drivers/ide/ide-default.c

+/*
+ *	ide-default		-	Driver for unbound ide devices
+ *
+ *	This provides a clean way to bind a device to default operations
+ *	by having an actual driver class that rather than special casing
+ *	"no driver" all over the IDE code
+ *
+ *	Copyright (C) 2003, Red Hat <alan@redhat.com>
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/timer.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/major.h>
+#include <linux/errno.h>
+#include <linux/genhd.h>
+#include <linux/slab.h>
+#include <linux/cdrom.h>
+#include <linux/ide.h>
+
+#include <asm/byteorder.h>
+#include <asm/irq.h>
+#include <asm/uaccess.h>
+#include <asm/io.h>
+#include <asm/unaligned.h>
+#include <asm/bitops.h>
+
+#define IDEDEFAULT_VERSION	"0.9.newide"
+/*
+ *	Driver initialization.
+ */
+
+static int idedefault_attach(ide_drive_t *drive);
+
+/*
+ *	IDE subdriver functions, registered with ide.c
+ *
+ *	idedefault *must* support DMA because it will be
+ *	attached before the other drivers are loaded and
+ *	we don't want to lose the DMA status at probe
+ *	time.
+ */
+
+ide_driver_t idedefault_driver = {
+	.name		=	"ide-default",
+	.version	=	IDEDEFAULT_VERSION,
+	.attach		=	idedefault_attach,
+	.supports_dma	=	1,
+	.drives		=	LIST_HEAD_INIT(idedefault_driver.drives)
+};
+
+static int idedefault_attach (ide_drive_t *drive)
+{
+	if (ide_register_subdriver(drive,
+			&idedefault_driver, IDE_SUBDRIVER_VERSION)) {
+		printk(KERN_ERR "ide-default: %s: Failed to register the "
+			"driver with ide.c\n", drive->name);
+		return 1;
+	}
+	return 0;
+}
+
+MODULE_DESCRIPTION("IDE Default Driver");
+
+MODULE_LICENSE("GPL");