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drivers: base: Don't match devices with NULL of_node/fwnode/etc

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of_find_device_by_node(), bus_find_device_by_of_node(),
bus_find_device_by_fwnode(), ..., all produce arbitrary results when
provided with a NULL of_node, fwnode, ACPI handle, etc. This is
counterintuitive, and the source of a few bugs, such as the one fixed by
commit 5c8418cf40 ("PCI/pwrctrl: Unregister platform device only if
one actually exists").

It's hard to imagine a good reason that these device_match_*() APIs
should return 'true' for a NULL argument. Augment these to return 0
(false).

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Brian Norris <briannorris@chromium.org>
Acked-by: David Gow <davidgow@google.com>
Acked-by: Shuah Khan <skhan@linuxfoundation.org>
Link: https://lore.kernel.org/r/20241216201148.535115-2-briannorris@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Brian Norris 2024-12-16 12:11:42 -08:00 • committed by Greg Kroah-Hartman
parent 5ab5a3778d
commit 1b1bb7b29b
1 changed files with 4 additions and 4 deletions
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8
drivers/base/core.c
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@ -5246,13 +5246,13 @@ EXPORT_SYMBOL_GPL(device_match_name);
int device_match_of_node(struct device *dev, const void *np)
{
return dev->of_node == np;
return np && dev->of_node == np;
}
EXPORT_SYMBOL_GPL(device_match_of_node);
int device_match_fwnode(struct device *dev, const void *fwnode)
{
return dev_fwnode(dev) == fwnode;
return fwnode && dev_fwnode(dev) == fwnode;
}
EXPORT_SYMBOL_GPL(device_match_fwnode);
@ -5264,13 +5264,13 @@ EXPORT_SYMBOL_GPL(device_match_devt);
int device_match_acpi_dev(struct device *dev, const void *adev)
{
return ACPI_COMPANION(dev) == adev;
return adev && ACPI_COMPANION(dev) == adev;
}
EXPORT_SYMBOL(device_match_acpi_dev);
int device_match_acpi_handle(struct device *dev, const void *handle)
{
return ACPI_HANDLE(dev) == handle;
return handle && ACPI_HANDLE(dev) == handle;
}
EXPORT_SYMBOL(device_match_acpi_handle);