block/pf: replace pf_sleep() with

@@ -526,12 +526,6 @@ static void pf_eject(struct pf_unit *pf)
 
 #define PF_RESET_TMO   30	/* in tenths of a second */
 
-static void pf_sleep(int cs)
-{
-	current->state = TASK_INTERRUPTIBLE;
-	schedule_timeout(cs);
-}
-
 /* the ATAPI standard actually specifies the contents of all 7 registers
    after a reset, but the specification is ambiguous concerning the last
    two bytes, and different drives interpret the standard differently.

@@ -546,11 +540,11 @@ static int pf_reset(struct pf_unit *pf)
 	write_reg(pf, 6, 0xa0+0x10*pf->drive);
 	write_reg(pf, 7, 8);
 
-	pf_sleep(20 * HZ / 1000);
+	msleep_interruptible(20);
 
 	k = 0;
 	while ((k++ < PF_RESET_TMO) && (status_reg(pf) & STAT_BUSY))
-		pf_sleep(HZ / 10);
+		msleep_interruptible(100);
 
 	flg = 1;
 	for (i = 0; i < 5; i++)