Merge tag 'drm-next-2020-12-18' of git://anongit.freedesktop.org/drm/drm

Pull more drm updates from Daniel Vetter:
 "UAPI Changes:

   - Only enable char/agp uapi when CONFIG_DRM_LEGACY is set

  Cross-subsystem Changes:

   - vma_set_file helper to make vma->vm_file changing less brittle,
     acked by Andrew

  Core Changes:

   - dma-buf heaps improvements

   - pass full atomic modeset state to driver callbacks

   - shmem helpers: cached bo by default

   - cleanups for fbdev, fb-helpers

   - better docs for drm modes and SCALING_FITLER uapi

   - ttm: fix dma32 page pool regression

  Driver Changes:

   - multi-hop regression fixes for amdgpu, radeon, nouveau

   - lots of small amdgpu hw enabling fixes (display, pm, ...)

   - fixes for imx, mcde, meson, some panels, virtio, qxl, i915, all
     fairly minor

   - some cleanups for legacy drm/fbdev drivers"

* tag 'drm-next-2020-12-18' of git://anongit.freedesktop.org/drm/drm: (117 commits)
  drm/qxl: don't allocate a dma_address array
  drm/nouveau: fix multihop when move doesn't work.
  drm/i915/tgl: Fix REVID macros for TGL to fetch correct stepping
  drm/i915: Fix mismatch between misplaced vma check and vma insert
  drm/i915/perf: also include Gen11 in OATAILPTR workaround
  Revert "drm/i915: re-order if/else ladder for hpd_irq_setup"
  drm/amdgpu/disply: fix documentation warnings in display manager
  drm/amdgpu: print mmhub client name for dimgrey_cavefish
  drm/amdgpu: set mode1 reset as default for dimgrey_cavefish
  drm/amd/display: Add get_dig_frontend implementation for DCEx
  drm/radeon: remove h from printk format specifier
  drm/amdgpu: remove h from printk format specifier
  drm/amdgpu: Fix spelling mistake "Heterogenous" -> "Heterogeneous"
  drm/amdgpu: fix regression in vbios reservation handling on headless
  drm/amdgpu/SRIOV: Extend VF reset request wait period
  drm/amdkfd: correct amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu log.
  drm/amd/display: Adding prototype for dccg21_update_dpp_dto()
  drm/amdgpu: print what method we are using for runtime pm
  drm/amdgpu: simplify logic in atpx resume handling
  drm/amdgpu: no need to call pci_ignore_hotplug for _PR3
  ...

2 files changed, 13 insertions, 1 deletions

diff --git a/mm/mmap.c b/mm/mmap.c
index 10598e5d4757..dc7206032387 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1897,8 +1897,8 @@ out:
 	return addr;
 
 unmap_and_free_vma:
+	fput(vma->vm_file);
 	vma->vm_file = NULL;
-	fput(file);
 
 	/* Undo any partial mapping done by a device driver. */
 	unmap_region(mm, vma, prev, vma->vm_start, vma->vm_end);
diff --git a/mm/util.c b/mm/util.c
index 4ddb6e186dd5..8c9b7d1e7c49 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -311,6 +311,18 @@ int vma_is_stack_for_current(struct vm_area_struct *vma)
 	return (vma->vm_start <= KSTK_ESP(t) && vma->vm_end >= KSTK_ESP(t));
 }
 
+/*
+ * Change backing file, only valid to use during initial VMA setup.
+ */
+void vma_set_file(struct vm_area_struct *vma, struct file *file)
+{
+	/* Changing an anonymous vma with this is illegal */
+	get_file(file);
+	swap(vma->vm_file, file);
+	fput(file);
+}
+EXPORT_SYMBOL(vma_set_file);
+
 #ifndef STACK_RND_MASK
 #define STACK_RND_MASK (0x7ff >> (PAGE_SHIFT - 12))     /* 8MB of VA */
 #endif