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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>
This commit is contained in:
Suzuki K Poulose 2019-06-14 18:53:58 +01:00 committed by Greg Kroah-Hartman
parent 29d14b668d
commit e6374f6b2e
1 changed files with 1 additions and 6 deletions
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7
drivers/acpi/utils.c
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@ -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);