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[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>
This commit is contained in:
Nishanth Aravamudan 2005-09-03 15:56:01 -07:00 committed by Linus Torvalds
parent 233ccd0d04
commit 0287ebedfa
3 changed files with 12 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
arch/ppc64/kernel/rtasd.c
View File

@ -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 */

7
arch/ppc64/kernel/rtc.c
View File

@ -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));

17
arch/ppc64/kernel/scanlog.c
View File

@ -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*/
}