From: Dan Williams <dan.j.williams@intel.com>
Date: Sat, 14 Oct 2017 17:42:02 -0700
Subject: dax: stop requiring a live device for dax_flush()
Git-commit: 6a21586a637e624ae736f94aeb0839f6a1dd0411
Patch-mainline: v4.15-rc1
References: FATE#326060

Now that dax_flush() is no longer a driver callback (commit c3ca015fab6d
"dax: remove the pmem_dax_ops->flush abstraction"), stop requiring the
dax_read_lock() to be held and the device to be alive.  This is in
preparation for switching filesystem-dax to store pfns instead of
sectors in the radix.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Acked-by: Johannes Thumshirn <jthumshirn@suse.de>
---
 drivers/dax/super.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/dax/super.c b/drivers/dax/super.c
index b0cc8117eebe..69329e3954ea 100644
--- a/drivers/dax/super.c
+++ b/drivers/dax/super.c
@@ -273,9 +273,6 @@ EXPORT_SYMBOL_GPL(dax_copy_from_iter);
 void arch_wb_cache_pmem(void *addr, size_t size);
 void dax_flush(struct dax_device *dax_dev, void *addr, size_t size)
 {
-	if (unlikely(!dax_alive(dax_dev)))
-		return;
-
 	if (unlikely(!test_bit(DAXDEV_WRITE_CACHE, &dax_dev->flags)))
 		return;