Commit a7c9b603 authored by Linus Torvalds's avatar Linus Torvalds

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

Pull libnvcimm fix from Dan Williams:
 "One straggling fix for NVDIMM support.

  The KVM/QEMU enabling for NVDIMMs has recently reached the point where
  it is able to accept some ACPI _DSM requests from a guest VM.  However
  they immediately found that the 4.5-rc kernel is unusable because the
  kernel's 'nfit' driver fails to load upon seeing a valid "not
  supported" response from the virtual BIOS for an address range scrub
  command.

  It is not mandatory that a platform implement address range scrubbing,
  so this fix from Vishal properly treats the 'not supported' response
  as 'skip scrubbing and continue loading the driver'"

* 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
  nfit: Continue init even if ARS commands are unimplemented
parents c12f83c3 6e2452df
...@@ -1590,14 +1590,21 @@ static int acpi_nfit_find_poison(struct acpi_nfit_desc *acpi_desc, ...@@ -1590,14 +1590,21 @@ static int acpi_nfit_find_poison(struct acpi_nfit_desc *acpi_desc,
start = ndr_desc->res->start; start = ndr_desc->res->start;
len = ndr_desc->res->end - ndr_desc->res->start + 1; len = ndr_desc->res->end - ndr_desc->res->start + 1;
/*
* If ARS is unimplemented, unsupported, or if the 'Persistent Memory
* Scrub' flag in extended status is not set, skip this but continue
* initialization
*/
rc = ars_get_cap(nd_desc, ars_cap, start, len); rc = ars_get_cap(nd_desc, ars_cap, start, len);
if (rc == -ENOTTY) {
dev_dbg(acpi_desc->dev,
"Address Range Scrub is not implemented, won't create an error list\n");
rc = 0;
goto out;
}
if (rc) if (rc)
goto out; goto out;
/*
* If ARS is unsupported, or if the 'Persistent Memory Scrub' flag in
* extended status is not set, skip this but continue initialization
*/
if ((ars_cap->status & 0xffff) || if ((ars_cap->status & 0xffff) ||
!(ars_cap->status >> 16 & ND_ARS_PERSISTENT)) { !(ars_cap->status >> 16 & ND_ARS_PERSISTENT)) {
dev_warn(acpi_desc->dev, dev_warn(acpi_desc->dev,
......
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