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| author |   Dan Williams <dan.j.williams@intel.com> | 2017-03-27 21:53:38 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2017-03-27 21:53:38 -0700 |
| commit | b03b99a329a14b7302f37c3ea6da3848db41c8c5 (patch) | |
| tree | 7f4d5164748558d07dbc39fad1c6e92ad0826c81 /drivers/acpi/nfit/core.c | |
| parent | Linux 4.11-rc4 (diff) | |
| download | linux-dev-b03b99a329a14b7302f37c3ea6da3848db41c8c5.tar.xz linux-dev-b03b99a329a14b7302f37c3ea6da3848db41c8c5.zip | |
acpi, nfit, libnvdimm: fix interleave set cookie calculation (64-bit comparison)
While reviewing the -stable patch for commit 86ef58a4e35e "nfit,
libnvdimm: fix interleave set cookie calculation" Ben noted:
"This is returning an int, thus it's effectively doing a 32-bit
comparison and not the 64-bit comparison you say is needed."
Update the compare operation to be immune to this integer demotion problem.
Cc: <stable@vger.kernel.org>
Cc: Nicholas Moulin <nicholas.w.moulin@linux.intel.com>
Fixes: 86ef58a4e35e ("nfit, libnvdimm: fix interleave set cookie calculation")
Reported-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to '')
| -rw-r--r-- | drivers/acpi/nfit/core.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c index 662036bdc65e..c8ea9d698cd0 100644 --- a/drivers/acpi/nfit/core.c +++ b/drivers/acpi/nfit/core.c @@ -1617,7 +1617,11 @@ static int cmp_map(const void *m0, const void *m1) const struct nfit_set_info_map *map0 = m0; const struct nfit_set_info_map *map1 = m1; - return map0->region_offset - map1->region_offset; + if (map0->region_offset < map1->region_offset) + return -1; + else if (map0->region_offset > map1->region_offset) + return 1; + return 0; } /* Retrieve the nth entry referencing this spa */ |