Merge "staging: android: ashmem: fix a race condition in ASHMEM_SET_SIZE...

Merge "staging: android: ashmem: fix a race condition in ASHMEM_SET_SIZE ioctl" into mnc-dr-dev-qcom-lego

drivers/staging/android/ashmem.c

@@ -672,10 +672,12 @@ static long ashmem_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 		break;
 	case ASHMEM_SET_SIZE:
 		ret = -EINVAL;
+		mutex_lock(&ashmem_mutex);
 		if (!asma->file) {
 			ret = 0;
 			asma->size = (size_t) arg;
 		}
+		mutex_unlock(&ashmem_mutex);
 		break;
 	case ASHMEM_GET_SIZE:
 		ret = asma->size;