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>

1 files changed, 1 insertions, 6 deletions

diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
index 7def63ab00c0..1391b63cadfd 100644
--- a/drivers/acpi/utils.c
+++ b/drivers/acpi/utils.c
@@ -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);