Re: 2.4.7-pre9..

David Woodhouse (dwmw2@infradead.org)
Fri, 20 Jul 2001 11:23:43 +0100

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torvalds@transmeta.com said:
> I'm getting ready to do a 2.4.7, but one of the fixes in 2.4.7 is a
> nasty SMP race that was found and made it clear that using an old
> trick of having a semaphore on the stack and doing "down()" on it to
> wait for some event (that would do the "up()") was a really bad idea.

We need s/up_and_exit/complete_and_exit/ then.

Index: drivers/i2o/i2o_block.c
===================================================================
RCS file: /inst/cvs/linux/drivers/i2o/i2o_block.c,v
retrieving revision 1.3.2.25
diff -u -r1.3.2.25 i2o_block.c
--- drivers/i2o/i2o_block.c 2001/07/20 08:52:40 1.3.2.25
+++ drivers/i2o/i2o_block.c 2001/07/20 09:18:16
@@ -61,6 +61,7 @@

#include <asm/uaccess.h>
#include <asm/semaphore.h>
+#include <linux/completion.h>
#include <asm/io.h>
#include <asm/atomic.h>
#include <linux/smp_lock.h>
@@ -187,7 +188,7 @@
* evt_msg contains the last event.
*/
static DECLARE_MUTEX_LOCKED(i2ob_evt_sem);
-static DECLARE_MUTEX_LOCKED(i2ob_thread_dead);
+static DECLARE_COMPLETION(i2ob_thread_dead);
static spinlock_t i2ob_evt_lock = SPIN_LOCK_UNLOCKED;
static u32 evt_msg[MSG_FRAME_SIZE>>2];

@@ -859,7 +860,7 @@
}
};

- up_and_exit(&i2ob_thread_dead,0);
+ complete_and_exit(&i2ob_thread_dead,0);
return 0;
}

@@ -2002,7 +2003,7 @@
printk("waiting...");
}
/* Be sure it died */
- down(&i2ob_thread_dead);
+ wait_for_completion(&i2ob_thread_dead);
printk("done.\n");
}

Index: drivers/i2o/i2o_core.c
===================================================================
RCS file: /inst/cvs/linux/drivers/i2o/i2o_core.c,v
retrieving revision 1.3.2.25
diff -u -r1.3.2.25 i2o_core.c
--- drivers/i2o/i2o_core.c 2001/05/14 10:36:06 1.3.2.25
+++ drivers/i2o/i2o_core.c 2001/07/20 09:17:54
@@ -43,6 +43,7 @@
#include <linux/interrupt.h>
#include <linux/sched.h>
#include <asm/semaphore.h>
+#include <linux/completion.h>

#include <asm/io.h>
#include <linux/reboot.h>
@@ -206,7 +207,7 @@
*/

static DECLARE_MUTEX(evt_sem);
-static DECLARE_MUTEX_LOCKED(evt_dead);
+static DECLARE_COMPLETION(evt_dead);
DECLARE_WAIT_QUEUE_HEAD(evt_wait);

static struct notifier_block i2o_reboot_notifier =
@@ -905,7 +906,7 @@
dprintk(KERN_INFO "I2O event thread dead\n");
printk("exiting...");
evt_running = 0;
- up_and_exit(&evt_dead, 0);
+ complete_and_exit(&evt_dead, 0);
}

/*
@@ -3427,7 +3428,7 @@
stat = kill_proc(evt_pid, SIGTERM, 1);
if(!stat) {
printk("waiting...");
- down(&evt_dead);
+ wait_for_completion(&evt_dead);
}
printk("done.\n");
}
Index: drivers/net/8139too.c
===================================================================
RCS file: /inst/cvs/linux/drivers/net/8139too.c,v
retrieving revision 1.1.2.28
diff -u -r1.1.2.28 8139too.c
--- drivers/net/8139too.c 2001/07/19 07:54:26 1.1.2.28
+++ drivers/net/8139too.c 2001/07/20 09:20:09
@@ -152,10 +152,10 @@
#include <linux/delay.h>
#include <linux/ethtool.h>
#include <linux/mii.h>
+#include <linux/completion.h>
#include <asm/io.h>
#include <asm/uaccess.h>

-
#define RTL8139_DRIVER_NAME DRV_NAME " Fast Ethernet driver " DRV_VERSION
#define PFX DRV_NAME ": "

@@ -585,7 +585,7 @@
chip_t chipset;
pid_t thr_pid;
wait_queue_head_t thr_wait;
- struct semaphore thr_exited;
+ struct completion thr_exited;
u32 rx_config;
struct rtl_extra_stats xstats;
};
@@ -970,7 +970,7 @@
tp->mmio_addr = ioaddr;
spin_lock_init (&tp->lock);
init_waitqueue_head (&tp->thr_wait);
- init_MUTEX_LOCKED (&tp->thr_exited);
+ init_completion (&tp->thr_exited);

/* dev is fully set up and ready to use now */
DPRINTK("about to register device named %s (%p)...\n", dev->name, dev);
@@ -1632,7 +1632,7 @@
rtnl_unlock ();
}

- up_and_exit (&tp->thr_exited, 0);
+ complete_and_exit (&tp->thr_exited, 0);
}

@@ -2138,7 +2138,7 @@
printk (KERN_ERR "%s: unable to signal thread\n", dev->name);
return ret;
}
- down (&tp->thr_exited);
+ wait_for_completion (&tp->thr_exited);
}

DPRINTK ("%s: Shutting down ethercard, status was 0x%4.4x.\n",
Index: drivers/usb/hub.c
===================================================================
RCS file: /inst/cvs/linux/drivers/usb/hub.c,v
retrieving revision 1.2.2.41
diff -u -r1.2.2.41 hub.c
--- drivers/usb/hub.c 2001/05/14 09:53:16 1.2.2.41
+++ drivers/usb/hub.c 2001/07/20 09:20:29
@@ -36,7 +36,7 @@

static DECLARE_WAIT_QUEUE_HEAD(khubd_wait);
static int khubd_pid = 0; /* PID of khubd */
-static DECLARE_MUTEX_LOCKED(khubd_exited);
+static DECLARE_COMPLETION(khubd_exited);

static int usb_get_hub_descriptor(struct usb_device *dev, void *data, int size)
{
@@ -781,7 +781,7 @@

dbg("usb_hub_thread exiting");

- up_and_exit(&khubd_exited, 0);
+ complete_and_exit(&khubd_exited, 0);
}

static struct usb_device_id hub_id_table [] = {
@@ -834,7 +834,7 @@
/* Kill the thread */
ret = kill_proc(khubd_pid, SIGTERM, 1);

- down(&khubd_exited);
+ wait_for_completion(&khubd_exited);

/*
* Hub resources are freed for us by usb_deregister. It calls
Index: fs/jffs/inode-v23.c
===================================================================
RCS file: /inst/cvs/linux/fs/jffs/Attic/inode-v23.c,v
retrieving revision 1.1.2.12
diff -u -r1.1.2.12 inode-v23.c
--- fs/jffs/inode-v23.c 2001/06/28 11:16:55 1.1.2.12
+++ fs/jffs/inode-v23.c 2001/07/20 09:13:04
@@ -157,7 +157,7 @@
D1(printk (KERN_NOTICE "jffs_put_super(): Telling gc thread to die.\n"));
send_sig(SIGKILL, c->gc_task, 1);
}
- down (&c->gc_thread_sem);
+ wait_for_completion(&c->gc_thread_comp);

D1(printk (KERN_NOTICE "jffs_put_super(): Successfully waited on thread.\n"));

Index: fs/jffs/intrep.c
===================================================================
RCS file: /inst/cvs/linux/fs/jffs/Attic/intrep.c,v
retrieving revision 1.1.2.5
diff -u -r1.1.2.5 intrep.c
--- fs/jffs/intrep.c 2001/02/24 19:01:45 1.1.2.5
+++ fs/jffs/intrep.c 2001/07/20 09:11:15
@@ -3008,7 +3008,7 @@

current->session = 1;
current->pgrp = 1;
- init_MUTEX_LOCKED(&c->gc_thread_sem); /* barrier */
+ init_completion(&c->gc_thread_comp); /* barrier */
spin_lock_irq(&current->sigmask_lock);
siginitsetinv (&current->blocked, sigmask(SIGHUP) | sigmask(SIGKILL) | sigmask(SIGSTOP) | sigmask(SIGCONT));
recalc_sigpending(current);
@@ -3055,7 +3055,7 @@
D1(printk("jffs_garbage_collect_thread(): SIGKILL received.\n"));
c->gc_task = NULL;
unlock_kernel();
- up_and_exit(&c->gc_thread_sem, 0);
+ complete_and_exit(&c->gc_thread_comp, 0);
}
}

Index: include/linux/jffs.h
===================================================================
RCS file: /inst/cvs/linux/include/linux/jffs.h,v
retrieving revision 1.1.1.1.2.2
diff -u -r1.1.1.1.2.2 jffs.h
--- include/linux/jffs.h 2000/12/05 10:51:21 1.1.1.1.2.2
+++ include/linux/jffs.h 2001/07/20 09:58:49
@@ -22,6 +22,8 @@

#define JFFS_VERSION_STRING "1.0"

+#include <linux/completion.h>
+
/* This is a magic number that is used as an identification number for
this file system. It is written to the super_block structure. */
#define JFFS_MAGIC_SB_BITMASK 0x07c0 /* 1984 */
@@ -185,7 +187,7 @@
struct jffs_delete_list *delete_list; /* Track deleted files. */
pid_t thread_pid; /* GC thread's PID */
struct task_struct *gc_task; /* GC task struct */
- struct semaphore gc_thread_sem; /* GC thread exit mutex */
+ struct completion gc_thread_comp; /* GC thread exit mutex */
__u32 gc_minfree_threshold; /* GC trigger thresholds */
__u32 gc_maxdirty_threshold;
};
Index: include/linux/kernel.h
===================================================================
RCS file: /inst/cvs/linux/include/linux/kernel.h,v
retrieving revision 1.1.1.1.2.18
diff -u -r1.1.1.1.2.18 kernel.h
--- include/linux/kernel.h 2001/06/13 06:41:40 1.1.1.1.2.18
+++ include/linux/kernel.h 2001/07/20 09:17:05
@@ -45,14 +45,14 @@
#define FASTCALL(x) x
#endif

-struct semaphore;
+struct completion;

extern struct notifier_block *panic_notifier_list;
NORET_TYPE void panic(const char * fmt, ...)
__attribute__ ((NORET_AND format (printf, 1, 2)));
NORET_TYPE void do_exit(long error_code)
ATTRIB_NORET;
-NORET_TYPE void up_and_exit(struct semaphore *, long)
+NORET_TYPE void complete_and_exit(struct completion *, long)
ATTRIB_NORET;
extern int abs(int);
extern unsigned long simple_strtoul(const char *,char **,unsigned int);
Index: kernel/exit.c
===================================================================
RCS file: /inst/cvs/linux/kernel/exit.c,v
retrieving revision 1.3.2.32
diff -u -r1.3.2.32 exit.c
--- kernel/exit.c 2001/06/02 14:40:18 1.3.2.32
+++ kernel/exit.c 2001/07/20 09:09:16
@@ -473,10 +473,10 @@
goto fake_volatile;
}

-NORET_TYPE void up_and_exit(struct semaphore *sem, long code)
+NORET_TYPE void complete_and_exit(struct completion *comp, long code)
{
- if (sem)
- up(sem);
+ if (comp)
+ complete(comp);

do_exit(code);
}
Index: kernel/ksyms.c
===================================================================
RCS file: /inst/cvs/linux/kernel/ksyms.c,v
retrieving revision 1.3.2.78
diff -u -r1.3.2.78 ksyms.c
--- kernel/ksyms.c 2001/07/19 07:54:30 1.3.2.78
+++ kernel/ksyms.c 2001/07/20 09:20:39
@@ -422,7 +422,7 @@
EXPORT_SYMBOL(iomem_resource);

/* process management */
-EXPORT_SYMBOL(up_and_exit);
+EXPORT_SYMBOL(complete_and_exit);
EXPORT_SYMBOL(__wake_up);
EXPORT_SYMBOL(wake_up_process);
EXPORT_SYMBOL(sleep_on);

-- dwmw2

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