linux-kernel - [PATCH v3 0/2] acpi/nfit: Fix command-supported detection

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Date:   Tue, 15 Jan 2019 14:33:56 -0800
From:   Dan Williams <dan.j.williams@...el.com>
To:     linux-nvdimm@...ts.01.org
Cc:     stable@...r.kernel.org, stuart hayes <stuart.w.hayes@...il.com>,
        Sujith Pandel <sujith_pandel@...l.com>,
        Jeff Moyer <jmoyer@...hat.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        linux-kernel@...r.kernel.org, vishal.l.verma@...el.com
Subject: [PATCH v3 0/2] acpi/nfit: Fix command-supported detection

Changes since v2 [1]:
* Don't allow ND_CMD_CALL to bypass dsm_mask restrictions (Jeff)

[1]: https://lists.01.org/pipermail/linux-nvdimm/2019-January/019498.html

---

One last resend to make sure all the last bits of thrash have settled.

Quote patch2 changelog:

The _DSM function number validation only happens to succeed when the
generic Linux command number translation corresponds with a
DSM-family-specific function number. This breaks NVDIMM-N
implementations that correctly implement _LSR, _LSW, and _LSI, but do
not happen to publish support for DSM function numbers 4, 5, and 6.

Recall that the support for _LS{I,R,W} family of methods results in the
DIMM being marked as supporting those command numbers at
acpi_nfit_register_dimms() time. The DSM function mask is only used for
ND_CMD_CALL support of non-NVDIMM_FAMILY_INTEL devices.

---

Dan Williams (2):
      acpi/nfit: Block function zero DSMs
      acpi/nfit: Fix command-supported detection

 drivers/acpi/nfit/core.c |   59 +++++++++++++++++++++++++++++++++++-----------
 1 file changed, 45 insertions(+), 14 deletions(-)