drivers/net/arcnet/arcnet.c: use time_* macros

The functions time_before, time_before_eq, time_after, and time_after_eq are
more robust for comparing jiffies against other values.

So use the time_after() macro, defined in linux/jiffies.h, which deals with
wrapping correctly.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: S.Caglar Onur <caglar@pardus.org.tr>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/net/arcnet/arcnet.c

@@ -940,7 +940,7 @@ irqreturn_t arcnet_interrupt(int irq, void *dev_id)
 
 			/* is the RECON info empty or old? */
 			if (!lp->first_recon || !lp->last_recon ||
-			    jiffies - lp->last_recon > HZ * 10) {
+			    time_after(jiffies, lp->last_recon + HZ * 10)) {
 				if (lp->network_down)
 					BUGMSG(D_NORMAL, "reconfiguration detected: cabling restored?\n");
 				lp->first_recon = lp->last_recon = jiffies;
@@ -974,7 +974,8 @@ irqreturn_t arcnet_interrupt(int irq, void *dev_id)
 					lp->num_recons = 1;
 				}
 			}
-		} else if (lp->network_down && jiffies - lp->last_recon > HZ * 10) {
+		} else if (lp->network_down &&
+				time_after(jiffies, lp->last_recon + HZ * 10)) {
 			if (lp->network_down)
 				BUGMSG(D_NORMAL, "cabling restored?\n");
 			lp->first_recon = lp->last_recon = 0;

include/linux/arcdevice.h

@@ -283,8 +283,8 @@ struct arcnet_local {
 	int next_buf, first_free_buf;
 
 	/* network "reconfiguration" handling */
-	time_t first_recon,	/* time of "first" RECON message to count */
-		last_recon;	/* time of most recent RECON */
+	unsigned long first_recon; /* time of "first" RECON message to count */
+	unsigned long last_recon;  /* time of most recent RECON */
 	int num_recons;		/* number of RECONs between first and last. */
 	bool network_down;	/* do we think the network is down? */