platform/surface: tabletsw: Fix __le32 integer access

The sources.count field is a __le32 inside a packed struct. So use the
proper functions to access it.

Reported-by: kernel test robot <lkp@intel.com>
Fixes: 9f794056db5b ("platform/surface: Add KIP/POS tablet-mode switch driver")
Signed-off-by: Maximilian Luz <luzmaximilian@gmail.com>
Link: https://lore.kernel.org/r/20220717120735.2052160-1-luzmaximilian@gmail.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

diff --git a/drivers/platform/surface/surface_aggregator_tabletsw.c b/drivers/platform/surface/surface_aggregator_tabletsw.c
index 596ca6c..27d95a6 100644 (file)
--- a/drivers/platform/surface/surface_aggregator_tabletsw.c
+++ b/drivers/platform/surface/surface_aggregator_tabletsw.c
@@ -410,7 +410,7 @@ static int ssam_pos_get_source(struct ssam_tablet_sw *sw, u32 *source_id)
        if (status)
                return status;
 
-       if (sources.count == 0) {
+       if (get_unaligned_le32(&sources.count) == 0) {
                dev_err(&sw->sdev->dev, "no posture sources found\n");
                return -ENODEV;
        }
@@ -422,7 +422,7 @@ static int ssam_pos_get_source(struct ssam_tablet_sw *sw, u32 *source_id)
         * is a device that provides multiple sources, at which point we can
         * then try to figure out how to handle them.
         */
-       WARN_ON(sources.count > 1);
+       WARN_ON(get_unaligned_le32(&sources.count) > 1);
 
        *source_id = get_unaligned_le32(&sources.id[0]);
        return 0;