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authorPavel Machek <pavel@ucw.cz>2005-09-03 15:57:05 -0700
committerLinus Torvalds <torvalds@evo.osdl.org>2005-09-05 00:06:17 -0700
commit6161b2ce8116b9a623260ab811e2c035b3fac2e5 (patch)
tree8cb36b11631c0843fb5a7e600626a2f6a230846b /kernel/power/process.c
parent99dc7d63e0dcb457580241055b2a39d011309db8 (diff)
downloadop-kernel-dev-6161b2ce8116b9a623260ab811e2c035b3fac2e5.zip
op-kernel-dev-6161b2ce8116b9a623260ab811e2c035b3fac2e5.tar.gz
[PATCH] pm: fix process freezing
If process freezing fails, some processes are frozen, and rest are left in "were asked to be frozen" state. Thats wrong, we should leave it in some consistent state. Signed-off-by: Pavel Machek <pavel@suse.cz> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/power/process.c')
-rw-r--r--kernel/power/process.c24
1 files changed, 22 insertions, 2 deletions
diff --git a/kernel/power/process.c b/kernel/power/process.c
index f7da5bf..28de118 100644
--- a/kernel/power/process.c
+++ b/kernel/power/process.c
@@ -81,13 +81,33 @@ int freeze_processes(void)
} while_each_thread(g, p);
read_unlock(&tasklist_lock);
yield(); /* Yield is okay here */
- if (time_after(jiffies, start_time + TIMEOUT)) {
+ if (todo && time_after(jiffies, start_time + TIMEOUT)) {
printk( "\n" );
printk(KERN_ERR " stopping tasks failed (%d tasks remaining)\n", todo );
- return todo;
+ break;
}
} while(todo);
+ /* This does not unfreeze processes that are already frozen
+ * (we have slightly ugly calling convention in that respect,
+ * and caller must call thaw_processes() if something fails),
+ * but it cleans up leftover PF_FREEZE requests.
+ */
+ if (todo) {
+ read_lock(&tasklist_lock);
+ do_each_thread(g, p)
+ if (freezing(p)) {
+ pr_debug(" clean up: %s\n", p->comm);
+ p->flags &= ~PF_FREEZE;
+ spin_lock_irqsave(&p->sighand->siglock, flags);
+ recalc_sigpending_tsk(p);
+ spin_unlock_irqrestore(&p->sighand->siglock, flags);
+ }
+ while_each_thread(g, p);
+ read_unlock(&tasklist_lock);
+ return todo;
+ }
+
printk( "|\n" );
BUG_ON(in_atomic());
return 0;
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