linux-kernel - Re: [PATCH] nfit: add Microsoft NVDIMM DSM command set to white list

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Message-ID: <20160619175920.GA12470@xo-6d-61-c0.localdomain>
Date:	Sun, 19 Jun 2016 19:59:20 +0200
From:	Pavel Machek <pavel@....cz>
To:	Stuart Hayes <stuart.w.hayes@...il.com>
Cc:	linux-nvdimm@...ts.01.org, dan.j.williams@...el.com,
	ross.zwisler@...ux.intel.com, rjw@...ysocki.net,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] nfit: add Microsoft NVDIMM DSM command set to white list

Hi!

> >Add the Microsoft _DSM command set to the white list of NVDIMM command sets.
> >
> >This command set is documented at https://msdn.microsoft.com/library/windows/hardware/mt604741.
> >
> >Signed-off-by: Stuart Hayes <stuart.w.hayes@...il.com>
> >---
> > drivers/acpi/nfit.c        | 9 ++++++---
> > drivers/acpi/nfit.h        | 4 ++++
> > include/uapi/linux/ndctl.h | 1 +
> > 3 files changed, 11 insertions(+), 3 deletions(-)
> >
> >diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c
> >index 2215fc8..48fc575 100644
> >--- a/drivers/acpi/nfit.c
> >+++ b/drivers/acpi/nfit.c
> >@@ -1130,11 +1130,11 @@ static int acpi_nfit_add_dimm(struct acpi_nfit_desc *acpi_desc,
> >     }
> >
> >     /*
> >-     * Until standardization materializes we need to consider up to 3
> >+     * Until standardization materializes we need to consider several
> >      * different command sets.  Note, that checking for function0 (bit0)
> >      * tells us if any commands are reachable through this uuid.
> >      */
> >-    for (i = NVDIMM_FAMILY_INTEL; i <= NVDIMM_FAMILY_HPE2; i++)
> >+    for (i = NVDIMM_FAMILY_INTEL; i <= NVDIMM_FAMILY_MSFT; i++)
> >         if (acpi_check_dsm(adev_dimm->handle, to_nfit_uuid(i), 1, 1))

Time to introduce NVDIMM_FAMILY_MAX?

> >@@ -1150,7 +1150,9 @@ static int acpi_nfit_add_dimm(struct acpi_nfit_desc *acpi_desc,
> >         dsm_mask = 0x1fe;
> >         if (disable_vendor_specific)
> >             dsm_mask &= ~(1 << 8);
> >-    } else {
> >+    } else if (nfit_mem->family == NVDIMM_FAMILY_MSFT)
> >+        dsm_mask = 0xffffffff;
> >+    else {
> >         dev_err(dev, "unknown dimm command family\n");
> >         nfit_mem->family = -1;
> >         return force_enable_dimms ? 0 : -ENODEV;

I'd really use {} around the if (), so that it is clear what the else belongs to.

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html