[PATCH] floppy: use time_after() and time_before() macros

From: Marcelo Feitoza Parisi <marcelo@feitoza.com.br>

They deal with wrapping correctly and are nicer to read.

Signed-off-by: Marcelo Feitoza Parisi <marcelo@feitoza.com.br>
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>

Index: linux-kj/drivers/block/floppy.c
===================================================================
--- linux-kj.orig/drivers/block/floppy.c	2005-09-21 01:23:52.000000000 +0400
+++ linux-kj/drivers/block/floppy.c	2005-09-21 01:50:41.000000000 +0400
@@ -179,6 +179,7 @@ static int print_unex = 1;
 #include <linux/devfs_fs_kernel.h>
 #include <linux/device.h>
 #include <linux/buffer_head.h>	/* for invalidate_buffers() */
+#include <linux/jiffies.h>
 
 /*
  * PS/2 floppies have much slower step rates than regular floppies.
@@ -735,7 +736,7 @@ static int disk_change(int drive)
 {
 	int fdc = FDC(drive);
 #ifdef FLOPPY_SANITY_CHECK
-	if (jiffies - UDRS->select_date < UDP->select_delay)
+	if (time_before(jiffies, UDRS->select_date + UDP->select_delay))
 		DPRINT("WARNING disk change called early\n");
 	if (!(FDCS->dor & (0x10 << UNIT(drive))) ||
 	    (FDCS->dor & 3) != UNIT(drive) || fdc != FDC(drive)) {
@@ -1063,7 +1064,7 @@ static int fd_wait_for_completion(unsign
 		return 1;
 	}
 
-	if ((signed)(jiffies - delay) < 0) {
+	if (time_before(jiffies, delay)) {
 		del_timer(&fd_timer);
 		fd_timer.function = function;
 		fd_timer.expires = delay;
@@ -1523,7 +1524,7 @@ static void setup_rw_floppy(void)
 		 * again just before spinup completion. Beware that
 		 * after scandrives, we must again wait for selection.
 		 */
-		if ((signed)(ready_date - jiffies) > DP->select_delay) {
+		if (time_after(ready_date, jiffies + DP->select_delay)) {
 			ready_date -= DP->select_delay;
 			function = (timeout_fn) floppy_start;
 		} else