workqueues: do CPU_UP_CANCELED if CPU_UP_PREPARE fails

The bug was pointed out by Akinobu Mita <akinobu.mita@gmail.com>, and this
patch is based on his original patch.

workqueue_cpu_callback(CPU_UP_PREPARE) expects that if it returns
NOTIFY_BAD, _cpu_up() will send CPU_UP_CANCELED then.

However, this is not true since

	"cpu hotplug: cpu: deliver CPU_UP_CANCELED only to NOTIFY_OKed callbacks with CPU_UP_PREPARE"
	commit: a0d8cdb652d35af9319a9e0fb7134de2a276c636

The callback which has returned NOTIFY_BAD will not receive
CPU_UP_CANCELED.  Change the code to fulfil the CPU_UP_CANCELED logic if
CPU_UP_PREPARE fails.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Reported-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 6 insertions, 3 deletions

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 7cf430372f89..ec7e4f62aaff 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -911,6 +911,7 @@ static int __devinit workqueue_cpu_callback(struct notifier_block *nfb,
         unsigned int cpu = (unsigned long)hcpu;
         struct cpu_workqueue_struct *cwq;
         struct workqueue_struct *wq;
+        int ret = NOTIFY_OK;
 
         action &= ~CPU_TASKS_FROZEN;
 
@@ -918,7 +919,7 @@ static int __devinit workqueue_cpu_callback(struct notifier_block *nfb,
         case CPU_UP_PREPARE:
                 cpu_set(cpu, cpu_populated_map);
         }
-
+undo:
         list_for_each_entry(wq, &workqueues, list) {
                 cwq = per_cpu_ptr(wq->cpu_wq, cpu);
 
@@ -928,7 +929,9 @@ static int __devinit workqueue_cpu_callback(struct notifier_block *nfb,
                                 break;
                         printk(KERN_ERR "workqueue [%s] for %i failed\n",
                                 wq->name, cpu);
-                        return NOTIFY_BAD;
+                        action = CPU_UP_CANCELED;
+                        ret = NOTIFY_BAD;
+                        goto undo;
 
                 case CPU_ONLINE:
                         start_workqueue_thread(cwq, cpu);
@@ -948,7 +951,7 @@ static int __devinit workqueue_cpu_callback(struct notifier_block *nfb,
                 cpu_clear(cpu, cpu_populated_map);
         }
 
-        return NOTIFY_OK;
+        return ret;
 }
 
 void __init init_workqueues(void)