Re: 2.6.30-rc8 Oops whilst booting

[Linus Torvalds <torvalds@linux-foundation.org>]

On Mon, 8 Jun 2009, James Bottomley wrote:
> 
> I think it's a bug in the async code.  It's providing cookies too high
> because it doesn't stop after it finds a running entry.
> 
> Can we try this as the fix?

Ok, this looks likely.

That said, why doesn't that function look like this?

		Linus
---
 kernel/async.c |   15 +++++----------
 1 files changed, 5 insertions(+), 10 deletions(-)

diff --git a/kernel/async.c b/kernel/async.c
index 5054030..27235f5 100644
--- a/kernel/async.c
+++ b/kernel/async.c
@@ -92,23 +92,18 @@ extern int initcall_debug;
 static async_cookie_t  __lowest_in_progress(struct list_head *running)
 {
 	struct async_entry *entry;
-	async_cookie_t ret = next_cookie; /* begin with "infinity" value */
 
 	if (!list_empty(running)) {
 		entry = list_first_entry(running,
 			struct async_entry, list);
-		ret = entry->cookie;
+		return entry->cookie;
 	}
 
-	if (!list_empty(&async_pending)) {
-		list_for_each_entry(entry, &async_pending, list)
-			if (entry->running == running) {
-				ret = entry->cookie;
-				break;
-			}
-	}
+	list_for_each_entry(entry, &async_pending, list)
+		if (entry->running == running)
+			return entry->cookie;
 
-	return ret;
+	return next_cookie;	/* "infinity" value */
 }
 
 static async_cookie_t  lowest_in_progress(struct list_head *running)