Merge branch 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm

Pull nvdimm fix from Dan Williams:
 "A single fix for status register read size in the nd_blk driver.

  The effect of getting the width of this register read wrong is that
  all I/O fails when the read returns non-zero.  Given the availability
  of ACPI 6 NFIT enabled platforms, this could reasonably wait to come
  in during the 4.3 merge window with a tag for 4.2-stable.  Otherwise,
  this makes the 4.2 kernel fully functional with devices that conform
  to the mmio-block-apertures defined in the ACPI 6 NFIT (NVDIMM
  Firmware Interface Table)"

* 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
  nfit, nd_blk: BLK status register is only 32 bits

Author: torvalds

drivers/acpi/nfit.c

@@ -1024,15 +1024,15 @@ static void wmb_blk(struct nfit_blk *nfit_blk)
 		wmb_pmem();
 }
 
-static u64 read_blk_stat(struct nfit_blk *nfit_blk, unsigned int bw)
+static u32 read_blk_stat(struct nfit_blk *nfit_blk, unsigned int bw)
 {
 	struct nfit_blk_mmio *mmio = &nfit_blk->mmio[DCR];
 	u64 offset = nfit_blk->stat_offset + mmio->size * bw;
 
 	if (mmio->num_lines)
 		offset = to_interleave_offset(offset, mmio);
 
-	return readq(mmio->base + offset);
+	return readl(mmio->base + offset);
 }
 
 static void write_blk_ctl(struct nfit_blk *nfit_blk, unsigned int bw,