platform/x86: huawei-wmi: do not hard-code sizes

Use `sizeof()` and `ARRAY_SIZE()` instead of
hard-coding buffer sizes and indices.

Signed-off-by: Barnabás Pőcze <pobrn@protonmail.com>
Link: https://lore.kernel.org/r/20221005150032.173198-1-pobrn@protonmail.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

diff --git a/drivers/platform/x86/huawei-wmi.c b/drivers/platform/x86/huawei-wmi.c
index 415ccb3..2b48e86 100644 (file)
--- a/drivers/platform/x86/huawei-wmi.c
+++ b/drivers/platform/x86/huawei-wmi.c
@@ -323,12 +323,12 @@ static int huawei_wmi_battery_get(int *start, int *end)
        u8 ret[0x100];
        int err, i;
 
-       err = huawei_wmi_cmd(BATTERY_THRESH_GET, ret, 0x100);
+       err = huawei_wmi_cmd(BATTERY_THRESH_GET, ret, sizeof(ret));
        if (err)
                return err;
 
        /* Find the last two non-zero values. Return status is ignored. */
-       i = 0xff;
+       i = ARRAY_SIZE(ret) - 1;
        do {
                if (start)
                        *start = ret[i-1];