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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2016-03-04 18:47:18 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-03-04 18:47:18 -0800 |
| commit | a7c9b603cf2371edacb054abc35597e810c1e5fd (patch) | |
| tree | ddbe118327a9ce3630bee14d7f69226eee9b6b14 /drivers | |
| parent | c12f83c3099c4dd73fe721409d2ce18ca79a753d (diff) | |
| parent | 6e2452dff4441e3dc24d415c8b2cda8a3ba52116 (diff) | |
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
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/acpi/nfit.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c index fb53db187854..35947ac87644 100644 --- a/drivers/acpi/nfit.c +++ b/drivers/acpi/nfit.c @@ -1590,14 +1590,21 @@ static int acpi_nfit_find_poison(struct acpi_nfit_desc *acpi_desc, start = ndr_desc->res->start; 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); + 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) 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) || !(ars_cap->status >> 16 & ND_ARS_PERSISTENT)) { dev_warn(acpi_desc->dev, |