From 09cab4308bf9b8076ee4a3c56015daf9ef9cb23e Mon Sep 17 00:00:00 2001
From: Loic Poulain <loic.poulain@linaro.org>
Date: Thu, 2 Dec 2021 10:02:12 +0100
Subject: [PATCH] wcn36xx: Fix max channels retrieval
Git-commit: 09cab4308bf9b8076ee4a3c56015daf9ef9cb23e
Patch-mainline: v5.17-rc1
References: git-fixes

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
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/net/wireless/ath/wcn36xx/smd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/wcn36xx/smd.c b/drivers/net/wireless/ath/wcn36xx/smd.c
index eb7493e2c958..bcc35308ded4 100644
--- 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;
-- 
2.31.1