[PATCH] ppc64: replace schedule_timeout() with msleep_interruptible()

Use msleep_interruptible() instead of schedule_timeout() in ppc64-specific
code to cleanup/simplify the sleeping logic.  Change the units of the
parameter of do_event_scan_all_cpus() to milliseconds from jiffies.  The
return value of rtas_extended_busy_delay_time() was incorrectly being used
as a jiffies value (it is actually milliseconds), which is fixed by using
the value as a parameter to msleep_interruptible().  Also, use
rtas_extended_busy_delay_time() in another case where similar logic is
duplicated.

Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 12 insertions, 22 deletions

diff --git a/arch/ppc64/kernel/rtasd.c b/arch/ppc64/kernel/rtasd.c
index b0c3b829fe47..e26b0420b6dd 100644
--- a/arch/ppc64/kernel/rtasd.c
+++ b/arch/ppc64/kernel/rtasd.c
@@ -19,6 +19,7 @@
 #include <linux/vmalloc.h>
 #include <linux/spinlock.h>
 #include <linux/cpu.h>
+#include <linux/delay.h>
 
 #include <asm/uaccess.h>
 #include <asm/io.h>
@@ -412,8 +413,7 @@ static void do_event_scan_all_cpus(long delay)
 
                 /* Drop hotplug lock, and sleep for the specified delay */
                 unlock_cpu_hotplug();
-                set_current_state(TASK_INTERRUPTIBLE);
-                schedule_timeout(delay);
+                msleep_interruptible(delay);
                 lock_cpu_hotplug();
 
                 cpu = next_cpu(cpu, cpu_online_map);
@@ -442,7 +442,7 @@ static int rtasd(void *unused)
 
         printk(KERN_INFO "RTAS daemon started\n");
 
-        DEBUG("will sleep for %d jiffies\n", (HZ*60/rtas_event_scan_rate) / 2);
+        DEBUG("will sleep for %d milliseconds\n", (30000/rtas_event_scan_rate));
 
         /* See if we have any error stored in NVRAM */
         memset(logdata, 0, rtas_error_log_max);
@@ -459,7 +459,7 @@ static int rtasd(void *unused)
         }
 
         /* First pass. */
-        do_event_scan_all_cpus(HZ);
+        do_event_scan_all_cpus(1000);
 
         if (surveillance_timeout != -1) {
                 DEBUG("enabling surveillance\n");
@@ -471,7 +471,7 @@ static int rtasd(void *unused)
          * machines have problems if we call event-scan too
          * quickly. */
         for (;;)
-                do_event_scan_all_cpus((HZ*60/rtas_event_scan_rate) / 2);
+                do_event_scan_all_cpus(30000/rtas_event_scan_rate);
 
 error:
         /* Should delete proc entries */
diff --git a/arch/ppc64/kernel/rtc.c b/arch/ppc64/kernel/rtc.c
index d729fefa0df5..6ff52bc61325 100644
--- a/arch/ppc64/kernel/rtc.c
+++ b/arch/ppc64/kernel/rtc.c
@@ -35,6 +35,7 @@
 #include <linux/spinlock.h>
 #include <linux/bcd.h>
 #include <linux/interrupt.h>
+#include <linux/delay.h>
 
 #include <asm/io.h>
 #include <asm/uaccess.h>
@@ -351,8 +352,7 @@ void rtas_get_rtc_time(struct rtc_time *rtc_tm)
                                 return; /* delay not allowed */
                         }
                         wait_time = rtas_extended_busy_delay_time(error);
-                        set_current_state(TASK_INTERRUPTIBLE);
-                        schedule_timeout(wait_time);
+                        msleep_interruptible(wait_time);
                         error = RTAS_CLOCK_BUSY;
                 }
         } while (error == RTAS_CLOCK_BUSY && (__get_tb() < max_wait_tb));
@@ -386,8 +386,7 @@ int rtas_set_rtc_time(struct rtc_time *tm)
                         if (in_interrupt())
                                 return 1;       /* probably decrementer */
                         wait_time = rtas_extended_busy_delay_time(error);
-                        set_current_state(TASK_INTERRUPTIBLE);
-                        schedule_timeout(wait_time);
+                        msleep_interruptible(wait_time);
                         error = RTAS_CLOCK_BUSY;
                 }
         } while (error == RTAS_CLOCK_BUSY && (__get_tb() < max_wait_tb));
diff --git a/arch/ppc64/kernel/scanlog.c b/arch/ppc64/kernel/scanlog.c
index 4d70736619c7..215bf8900304 100644
--- a/arch/ppc64/kernel/scanlog.c
+++ b/arch/ppc64/kernel/scanlog.c
@@ -25,6 +25,7 @@
 #include <linux/errno.h>
 #include <linux/proc_fs.h>
 #include <linux/init.h>
+#include <linux/delay.h>
 #include <asm/uaccess.h>
 #include <asm/rtas.h>
 #include <asm/prom.h>
@@ -77,7 +78,7 @@ static ssize_t scanlog_read(struct file *file, char __user *buf,
                 return -EFAULT;
 
         for (;;) {
-                wait_time = HZ/2;       /* default wait if no data */
+                wait_time = 500;        /* default wait if no data */
                 spin_lock(&rtas_data_buf_lock);
                 memcpy(rtas_data_buf, data, RTAS_DATA_BUF_SIZE);
                 status = rtas_call(ibm_scan_log_dump, 2, 1, NULL,
@@ -107,24 +108,14 @@ static ssize_t scanlog_read(struct file *file, char __user *buf,
                         break;
                     default:
                         if (status > 9900 && status <= 9905) {
-                                /* No data.  RTAS is hinting at a delay required
-                                 * between 1-100000 milliseconds
-                                 */
-                                int ms = 1;
-                                for (; status > 9900; status--)
-                                        ms = ms * 10;
-                                /* Use microseconds for reasonable accuracy */
-                                ms *= 1000;
-                                wait_time = ms / (1000000/HZ); /* round down is fine */
-                                /* Fall through to sleep */
+                                wait_time = rtas_extended_busy_delay_time(status);
                         } else {
                                 printk(KERN_ERR "scanlog: unknown error from rtas: %d\n", status);
                                 return -EIO;
                         }
                 }
                 /* Apparently no data yet.  Wait and try again. */
-                set_current_state(TASK_INTERRUPTIBLE);
-                schedule_timeout(wait_time);
+                msleep_interruptible(wait_time);
         }
         /*NOTREACHED*/
 }