Commit e6374f6b authored Jun 14, 2019 by Suzuki K Poulose Committed by Greg Kroah-Hartman Jun 24, 2019

acpi: utils: Cleanup acpi_dev_match_cb



The prototype of bus_find_device() will be unified with that of
class_find_device() subsequently, but for this purpose the callback
functions passed to it need to take (const void *) as the second
argument.  Consequently, they cannot modify the memory pointed to by
that argument which currently is not the case for acpi_dev_match_cb().
However, acpi_dev_match_cb() really need not modify the "match" object
passed to it, because acpi_dev_get_first_match_dev() which uses it via
bus_find_device() can easily convert the result of bus_find_device()
into the pointer to return.

For this reason, update acpi_dev_match_cb() to avoid the redundant
memory updates.

Cc: Len Brown <lenb@kernel.org>
Cc: linux-acpi@vger.kernel.org
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 29d14b66

drivers/acpi/utils.c

+1 −6

Original line number	Diff line number	Diff line
		@@ -725,8 +725,6 @@ bool acpi_dev_found(const char *hid)
		EXPORT_SYMBOL(acpi_dev_found);

		struct acpi_dev_match_info {
		const char *dev_name;
		struct acpi_device *adev;
		struct acpi_device_id hid[2];
		const char *uid;
		s64 hrv;
		@@ -746,9 +744,6 @@ static int acpi_dev_match_cb(struct device dev, void data)
		strcmp(adev->pnp.unique_id, match->uid)))
		return 0;

		match->dev_name = acpi_dev_name(adev);
		match->adev = adev;

		if (match->hrv == -1)
		return 1;

		@@ -818,7 +813,7 @@ acpi_dev_get_first_match_dev(const char hid, const char uid, s64 hrv)
		match.hrv = hrv;

		dev = bus_find_device(&acpi_bus_type, NULL, &match, acpi_dev_match_cb);
		return dev ? match.adev : NULL;
		return dev ? to_acpi_device(dev) : NULL;
		}
		EXPORT_SYMBOL(acpi_dev_get_first_match_dev);