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@de.ibm.com>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>

diff --git a/kernel/async.c b/kernel/async.c
index 0c90d500ab6847db279407459fb4a009eb485e2e..078d5ed150d1522c33f7a04be378d2edc3a14712 100644 (file)
--- a/kernel/async.c
+++ b/kernel/async.c
@@ -54,6 +54,7 @@ asynchronous and synchronous parts of the kernel.
 #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;
@@ -319,7 +320,11 @@ static int async_manager_thread(void *unused)
                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++;
                }
@@ -334,7 +339,9 @@ static int async_manager_thread(void *unused)
 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;
 }