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Diffstat (limited to 'drivers/gpu/drm/i915/i915_gem_userptr.c')
-rw-r--r--drivers/gpu/drm/i915/i915_gem_userptr.c29
1 files changed, 17 insertions, 12 deletions
diff --git a/drivers/gpu/drm/i915/i915_gem_userptr.c b/drivers/gpu/drm/i915/i915_gem_userptr.c
index 18ba8139e922..4d30b60defda 100644
--- a/drivers/gpu/drm/i915/i915_gem_userptr.c
+++ b/drivers/gpu/drm/i915/i915_gem_userptr.c
@@ -501,19 +501,24 @@ __i915_gem_userptr_get_pages_worker(struct work_struct *_work)
if (pvec != NULL) {
struct mm_struct *mm = obj->userptr.mm->mm;
- down_read(&mm->mmap_sem);
- while (pinned < npages) {
- ret = get_user_pages_remote(work->task, mm,
- obj->userptr.ptr + pinned * PAGE_SIZE,
- npages - pinned,
- !obj->userptr.read_only, 0,
- pvec + pinned, NULL);
- if (ret < 0)
- break;
-
- pinned += ret;
+ ret = -EFAULT;
+ if (atomic_inc_not_zero(&mm->mm_users)) {
+ down_read(&mm->mmap_sem);
+ while (pinned < npages) {
+ ret = get_user_pages_remote
+ (work->task, mm,
+ obj->userptr.ptr + pinned * PAGE_SIZE,
+ npages - pinned,
+ !obj->userptr.read_only, 0,
+ pvec + pinned, NULL);
+ if (ret < 0)
+ break;
+
+ pinned += ret;
+ }
+ up_read(&mm->mmap_sem);
+ mmput(mm);
}
- up_read(&mm->mmap_sem);
}
mutex_lock(&dev->struct_mutex);
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