[PATCH] floppy: Run floppy initialization asynchronous

From: Andi Kleen
Date: Mon Jul 02 2012 - 20:07:08 EST

floppy_init is quite slow, 3s on my test system to determine
that there is no floppy. Run it asynchronous to the other
init calls to improve boot time.

Cuts down boot time by 1s on a system of mine.

Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>

diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index cce7df3..8b5769b 100644
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -191,6 +191,7 @@ static int print_unex = 1;
#include <linux/mutex.h>
#include <linux/io.h>
#include <linux/uaccess.h>
+#include <linux/async.h>

* PS/2 floppies have much slower step rates than regular floppies.
@@ -4122,7 +4123,7 @@ static struct kobject *floppy_find(dev_t dev, int *part, void *data)
return get_disk(disks[drive]);

-static int __init floppy_init(void)
+static int __init do_floppy_init(void)
int i, unit, drive;
int err, dr;
@@ -4337,6 +4338,24 @@ out_put_disk:
return err;

+#ifndef MODULE
+static __init void floppy_async_init(void *data, async_cookie_t cookie)
+ do_floppy_init();
+static int __init floppy_init(void)
+#ifdef MODULE
+ return do_floppy_init(void);
+ /* Don't hold up the bootup by the floppy initialization */
+ async_schedule(floppy_async_init, NULL);
+ return 0;
static const struct io_region {
int offset;
int size;

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