wcn36xx: Fix max channels retrieval

[ Upstream commit 09cab4308bf9b8076ee4a3c56015daf9ef9cb23e ]

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
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/wireless/ath/wcn36xx/smd.c b/drivers/net/wireless/ath/wcn36xx/smd.c
index 0ebef42feb695f0e4ce28fedf99b6dd621b48d34..c056fae1d64183a4fb9e8aa3b951b70c486b021b 100644 (file)
--- a/drivers/net/wireless/ath/wcn36xx/smd.c
+++ b/drivers/net/wireless/ath/wcn36xx/smd.c
@@ -943,7 +943,7 @@ 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;