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| author | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2020-08-18 17:24:29 +0300 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2020-09-24 13:57:38 +0300 |
| commit | a62d07e0006a3a3ce77041ca07f3c488ec880790 (patch) | |
| tree | 5b8e0525239fe97a0dd807720fba1e7ac58bc41f /drivers/acpi | |
| parent | 4eb3723f18e9ba4d4b13d82b6f7e68dd50a852ea (diff) | |
| download | linux-a62d07e0006a3a3ce77041ca07f3c488ec880790.tar.xz | |
ACPI: Remove side effect of partly creating a node in acpi_get_node()
acpi_get_node() calls acpi_get_pxm() to evaluate the _PXM AML method
for entries found in DSDT/SSDT. ACPI 6.3 sec 6.2.14 states
"_PXM evaluates to an integer that identifies a device as belonging to
a Proximity Domain defined in the System Resource Affinity Table (SRAT)."
Hence a _PXM method should not result in creation of a new NUMA node.
Before this patch, _PXM could result in partial instantiation of
NUMA node, missing elements such as zone lists. A call to
devm_kzalloc(), for example, results in a NULL pointer dereference.
This patch therefore replaces the acpi_map_pxm_to_node() with a call
to pxm_to_node().
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Hanjun Guo <guohanjun@huawei.com>
Reviewed-by: Barry Song <song.bao.hua@hisilicon.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/numa/srat.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/acpi/numa/srat.c b/drivers/acpi/numa/srat.c index 1fb486f46ee2..2c9a66c203ff 100644 --- a/drivers/acpi/numa/srat.c +++ b/drivers/acpi/numa/srat.c @@ -436,6 +436,6 @@ int acpi_get_node(acpi_handle handle) pxm = acpi_get_pxm(handle); - return acpi_map_pxm_to_node(pxm); + return pxm_to_node(pxm); } EXPORT_SYMBOL(acpi_get_node); |