remove transaction.atomic decorator

common/djangoapps/student/models.py

@@ -29,7 +29,7 @@ from django.contrib.auth.models import User
 from django.contrib.auth.signals import user_logged_in, user_logged_out
 from django.core.cache import cache
 from django.core.exceptions import ObjectDoesNotExist, MultipleObjectsReturned
-from django.db import models, IntegrityError, transaction
+from django.db import models, IntegrityError
 from django.db.models import Count
 from django.db.models.signals import pre_save, post_save
 from django.dispatch import receiver, Signal
@@ -1024,7 +1024,6 @@ class CourseEnrollment(models.Model):
         cache.delete(self.enrollment_status_hash_cache_key(self.user))
 
     @classmethod
-    @transaction.atomic
     def get_or_create_enrollment(cls, user, course_key):
         """
         Create an enrollment for a user in a class. By default *this enrollment