diff options
| -rw-r--r-- | mm/hmm.c | 28 |
1 files changed, 9 insertions, 19 deletions
@@ -130,26 +130,16 @@ static void hmm_release(struct mmu_notifier *mn, struct mm_struct *mm) */ WARN_ON(!list_empty_careful(&hmm->ranges)); - down_write(&hmm->mirrors_sem); - mirror = list_first_entry_or_null(&hmm->mirrors, struct hmm_mirror, - list); - while (mirror) { - list_del_init(&mirror->list); - if (mirror->ops->release) { - /* - * Drop mirrors_sem so the release callback can wait - * on any pending work that might itself trigger a - * mmu_notifier callback and thus would deadlock with - * us. - */ - up_write(&hmm->mirrors_sem); + down_read(&hmm->mirrors_sem); + list_for_each_entry(mirror, &hmm->mirrors, list) { + /* + * Note: The driver is not allowed to trigger + * hmm_mirror_unregister() from this thread. + */ + if (mirror->ops->release) mirror->ops->release(mirror); - down_write(&hmm->mirrors_sem); - } - mirror = list_first_entry_or_null(&hmm->mirrors, - struct hmm_mirror, list); } - up_write(&hmm->mirrors_sem); + up_read(&hmm->mirrors_sem); hmm_put(hmm); } @@ -279,7 +269,7 @@ void hmm_mirror_unregister(struct hmm_mirror *mirror) struct hmm *hmm = mirror->hmm; down_write(&hmm->mirrors_sem); - list_del_init(&mirror->list); + list_del(&mirror->list); up_write(&hmm->mirrors_sem); hmm_put(hmm); } |