wan: Use usleep_range()

Instead of using a jiffies hack we can use the standard api for delays.
Signed-off-by: NManuel Schölling <manuel.schoelling@gmx.de>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/wan/farsync.c

@@ -26,6 +26,7 @@
 #include <linux/ioport.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
+#include <linux/delay.h>
 #include <linux/if.h>
 #include <linux/hdlc.h>
 #include <asm/io.h>
@@ -678,7 +679,6 @@ static inline void
 fst_cpureset(struct fst_card_info *card)
 {
 	unsigned char interrupt_line_register;
-	unsigned long j = jiffies + 1;
 	unsigned int regval;
 
 	if (card->family == FST_FAMILY_TXU) {
@@ -696,16 +696,12 @@ fst_cpureset(struct fst_card_info *card)
 		/*
 		 * We are delaying here to allow the 9054 to reset itself
 		 */
-		j = jiffies + 1;
-		while (jiffies < j)
-			/* Do nothing */ ;
+		usleep_range(10, 20);
 		outw(0x240f, card->pci_conf + CNTRL_9054 + 2);
 		/*
 		 * We are delaying here to allow the 9054 to reload its eeprom
 		 */
-		j = jiffies + 1;
-		while (jiffies < j)
-			/* Do nothing */ ;
+		usleep_range(10, 20);
 		outw(0x040f, card->pci_conf + CNTRL_9054 + 2);
 
 		if (pci_write_config_byte