linux-kernel - [PATCH 2/3] async: Handle kthread

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Message-ID: <20090119134531.04c3725c@gondolin>
Date:	Mon, 19 Jan 2009 13:45:31 +0100
From:	Cornelia Huck <cornelia.huck@...ibm.com>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	<linux-kernel@...r.kernel.org>
Subject: [PATCH 2/3] async: Handle kthread_run() return codes.

If we fail to create the manager thread, fall back to non-fastboot.
If we fail to create an async thread, try again after waiting for
a bit.

Signed-off-by: Cornelia Huck <cornelia.huck@...ibm.com>

---
 kernel/async.c |   11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

--- linux-2.6.orig/kernel/async.c
+++ linux-2.6/kernel/async.c
@@ -54,6 +54,7 @@ asynchronous and synchronous parts of th
 #include <linux/sched.h>
 #include <linux/init.h>
 #include <linux/kthread.h>
+#include <linux/delay.h>
 #include <asm/atomic.h>
 
 static async_cookie_t next_cookie = 1;
@@ -315,7 +316,11 @@ static int async_manager_thread(void *un
 		ec = atomic_read(&entry_count);
 
 		while (tc < ec && tc < MAX_THREADS) {
-			kthread_run(async_thread, NULL, "async/%i", tc);
+			if (IS_ERR(kthread_run(async_thread, NULL, "async/%i",
+					       tc))) {
+				msleep(100);
+				continue;
+			}
 			atomic_inc(&thread_count);
 			tc++;
 		}
@@ -330,7 +335,9 @@ static int async_manager_thread(void *un
 static int __init async_init(void)
 {
 	if (async_enabled)
-		kthread_run(async_manager_thread, NULL, "async/mgr");
+		if (IS_ERR(kthread_run(async_manager_thread, NULL,
+				       "async/mgr")))
+			async_enabled = 0;
 	return 0;
 }
 
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