wcn36xx: Fix max channels retrieval

Kernel test robot reported:drivers/net/wireless/ath/wcn36xx/smd.c:943:33:
   sparse: sparse: cast truncates bits from constant value (780 becomes 80)

The 'channels' field is not a simple u8 array but an array of
channel_params. Using sizeof for retrieving the max number of
channels is then wrong.

In practice, it was not an issue, because the sizeof returned
value is 780, which is truncated in min_t (u8) to 80, which is
the value we expect...

Fix that properly using ARRAY_SIZE instead of sizeof.

Fixes: d707f812bb05 ("wcn36xx: Channel list update before hardware scan")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/1638435732-14657-1-git-send-email-loic.poulain@linaro.org

diff --git a/drivers/net/wireless/ath/wcn36xx/smd.c b/drivers/net/wireless/ath/wcn36xx/smd.c
index eb7493e2c958b0a4de643b08aba8cf90d11659e0..bcc35308ded45e7dc5a4188ad711ece3ad87853a 100644 (file)
--- a/drivers/net/wireless/ath/wcn36xx/smd.c
+++ b/drivers/net/wireless/ath/wcn36xx/smd.c
@@ -944,7 +944,7 @@ int wcn36xx_smd_update_channel_list(struct wcn36xx *wcn, struct cfg80211_scan_re
 
        INIT_HAL_MSG((*msg_body), WCN36XX_HAL_UPDATE_CHANNEL_LIST_REQ);
 
-       msg_body->num_channel = min_t(u8, req->n_channels, sizeof(msg_body->channels));
+       msg_body->num_channel = min_t(u8, req->n_channels, ARRAY_SIZE(msg_body->channels));
        for (i = 0; i < msg_body->num_channel; i++) {
                struct wcn36xx_hal_channel_param *param = &msg_body->channels[i];
                u32 min_power = WCN36XX_HAL_DEFAULT_MIN_POWER;