[PATCH] kernel/padata.c: always check the return value of __padata_remove_cpu()and __padata_add_cpu()

[Chen Gang]

When failure occures, __padata_add_cpu() and __padata_remove_cpu() will
return -ENOMEM, which need be noticed in any cases (even in cleaning up
cases).

Signed-off-by: Chen Gang <gang.chen@xxxxxxxxxxx>
---
 kernel/padata.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/kernel/padata.c b/kernel/padata.c
index 072f4ee..6a124cd 100644
--- a/kernel/padata.c
+++ b/kernel/padata.c
@@ -871,16 +871,20 @@ static int padata_cpu_callback(struct notifier_block *nfb,
 		if (!pinst_has_cpu(pinst, cpu))
 			break;
 		mutex_lock(&pinst->lock);
-		__padata_remove_cpu(pinst, cpu);
+		err = __padata_remove_cpu(pinst, cpu);
 		mutex_unlock(&pinst->lock);
+		if (err)
+			return notifier_from_errno(err);
 
 	case CPU_DOWN_FAILED:
 	case CPU_DOWN_FAILED_FROZEN:
 		if (!pinst_has_cpu(pinst, cpu))
 			break;
 		mutex_lock(&pinst->lock);
-		__padata_add_cpu(pinst, cpu);
+		err = __padata_add_cpu(pinst, cpu);
 		mutex_unlock(&pinst->lock);
+		if (err)
+			return notifier_from_errno(err);
 	}
 
 	return NOTIFY_OK;
-- 
1.7.7.6
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