Merge tag 'drm-intel-fixes-2013-11-07' of git://people.freedesktop.org/~danvet/drm-intel into drm-next

Bit a bit -fixes pull request in the merge window than usual dua to two
feauture-y things:
- Display CRCs are now enabled on all platforms, including the odd DP case
  on gm45/vlv. Since this is a testing-only feature it should ever hurt,
  but I figured it'll help with regression-testing -fixes. So I left it
  in and didn't postpone it to 3.14.
- Display power well refactoring from Imre. Would have caused major pain
  conflict with the bdw stage 1 patches if I'd postpone this to -next.
  It's only an relatively small interface rework, so shouldn't cause pain.
  It's also been in my tree since almost 3 weeks already.

That accounts for about two thirds of the pull, otherwise just bugfixes:
- vlv backlight fix from Jesse/Jani
- vlv vblank timestamp fix from Jesse
- improved edp detection through vbt from Ville (fixes a vlv issue)
- eDP vdd fix from Paulo
- fixes for dvo lvds on i830M
- a few smaller things all over

Note: This contains a backmerge of v3.12. Since the -internal branch
always applied on top of -nightly I need that unified base to merge bdw
patches. So you'll get a conflict with radeon connector props when pulling
this (and nouveau/master will also conflict a bit when Ben doesn't
rebase). The backmerge itself only had conflicts in drm/i915.

There's also a tiny conflict between Jani's backlight fix and your sysfs
lifetime fix in drm-next.

* tag 'drm-intel-fixes-2013-11-07' of git://people.freedesktop.org/~danvet/drm-intel: (940 commits)
  drm/i915/vlv: use per-pipe backlight controls v2
  drm/i915: make backlight functions take a connector
  drm/i915: move opregion asle request handling to a work queue
  drm/i915/vlv: use PIPE_START_VBLANK interrupts on VLV
  drm/i915: Make intel_dp_is_edp() less specific
  drm/i915: Give names to the VBT child device type bits
  drm/i915/vlv: enable HDA display audio for Valleyview2
  drm/i915/dvo: call ->mode_set callback only when the port is running
  drm/i915: avoid unclaimed registers when capturing the error state
  drm/i915: Enable DP port CRC for the "auto" source on g4x/vlv
  drm/i915: scramble reset support for DP port CRC on vlv
  drm/i915: scramble reset support for DP port CRC on g4x
  drm/i916: add "auto" pipe CRC source
  ...

Conflicts:
	MAINTAINERS
	drivers/gpu/drm/i915/intel_panel.c
	drivers/gpu/drm/nouveau/core/subdev/mc/base.c
	drivers/gpu/drm/radeon/atombios_encoders.c
	drivers/gpu/drm/radeon/radeon_connectors.c

1 files changed, 37 insertions, 15 deletions

diff --git a/fs/aio.c b/fs/aio.c
index 6b868f0..067e3d3 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -167,10 +167,25 @@ static int __init aio_setup(void)
 }
 __initcall(aio_setup);
 
+static void put_aio_ring_file(struct kioctx *ctx)
+{
+	struct file *aio_ring_file = ctx->aio_ring_file;
+	if (aio_ring_file) {
+		truncate_setsize(aio_ring_file->f_inode, 0);
+
+		/* Prevent further access to the kioctx from migratepages */
+		spin_lock(&aio_ring_file->f_inode->i_mapping->private_lock);
+		aio_ring_file->f_inode->i_mapping->private_data = NULL;
+		ctx->aio_ring_file = NULL;
+		spin_unlock(&aio_ring_file->f_inode->i_mapping->private_lock);
+
+		fput(aio_ring_file);
+	}
+}
+
 static void aio_free_ring(struct kioctx *ctx)
 {
 	int i;
-	struct file *aio_ring_file = ctx->aio_ring_file;
 
 	for (i = 0; i < ctx->nr_pages; i++) {
 		pr_debug("pid(%d) [%d] page->count=%d\n", current->pid, i,
@@ -178,14 +193,10 @@ static void aio_free_ring(struct kioctx *ctx)
 		put_page(ctx->ring_pages[i]);
 	}
 
+	put_aio_ring_file(ctx);
+
 	if (ctx->ring_pages && ctx->ring_pages != ctx->internal_pages)
 		kfree(ctx->ring_pages);
-
-	if (aio_ring_file) {
-		truncate_setsize(aio_ring_file->f_inode, 0);
-		fput(aio_ring_file);
-		ctx->aio_ring_file = NULL;
-	}
 }
 
 static int aio_ring_mmap(struct file *file, struct vm_area_struct *vma)
@@ -207,9 +218,8 @@ static int aio_set_page_dirty(struct page *page)
 static int aio_migratepage(struct address_space *mapping, struct page *new,
 			struct page *old, enum migrate_mode mode)
 {
-	struct kioctx *ctx = mapping->private_data;
+	struct kioctx *ctx;
 	unsigned long flags;
-	unsigned idx = old->index;
 	int rc;
 
 	/* Writeback must be complete */
@@ -224,10 +234,23 @@ static int aio_migratepage(struct address_space *mapping, struct page *new,
 
 	get_page(new);
 
-	spin_lock_irqsave(&ctx->completion_lock, flags);
-	migrate_page_copy(new, old);
-	ctx->ring_pages[idx] = new;
-	spin_unlock_irqrestore(&ctx->completion_lock, flags);
+	/* We can potentially race against kioctx teardown here.  Use the
+	 * address_space's private data lock to protect the mapping's
+	 * private_data.
+	 */
+	spin_lock(&mapping->private_lock);
+	ctx = mapping->private_data;
+	if (ctx) {
+		pgoff_t idx;
+		spin_lock_irqsave(&ctx->completion_lock, flags);
+		migrate_page_copy(new, old);
+		idx = old->index;
+		if (idx < (pgoff_t)ctx->nr_pages)
+			ctx->ring_pages[idx] = new;
+		spin_unlock_irqrestore(&ctx->completion_lock, flags);
+	} else
+		rc = -EBUSY;
+	spin_unlock(&mapping->private_lock);
 
 	return rc;
 }
@@ -617,8 +640,7 @@ out_freepcpu:
 out_freeref:
 	free_percpu(ctx->users.pcpu_count);
 out_freectx:
-	if (ctx->aio_ring_file)
-		fput(ctx->aio_ring_file);
+	put_aio_ring_file(ctx);
 	kmem_cache_free(kioctx_cachep, ctx);
 	pr_debug("error allocating ioctx %d\n", err);
 	return ERR_PTR(err);