netdev - [PATCH] net: wireless: ath: use div64_u64() instead of do

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Date:   Wed,  9 Feb 2022 00:39:32 -0800
From:   Qing Wang <wangqing@...o.com>
To:     Maya Erez <merez@...eaurora.org>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        linux-wireless@...r.kernel.org, wil6210@....qualcomm.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Wang Qing <wangqing@...o.com>
Subject: [PATCH] net: wireless: ath: use div64_u64() instead of do_div()

From: Wang Qing <wangqing@...o.com>

do_div() does a 64-by-32 division.
When the divisor is u64, do_div() truncates it to 32 bits, this means it
can test non-zero and be truncated to zero for division.

fix do_div.cocci warning:
do_div() does a 64-by-32 division, please consider using div64_u64 instead.

Signed-off-by: Wang Qing <wangqing@...o.com>
---
 drivers/net/wireless/ath/wil6210/debugfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/wil6210/debugfs.c b/drivers/net/wireless/ath/wil6210/debugfs.c
index 4c944e5..2cee9dd
--- a/drivers/net/wireless/ath/wil6210/debugfs.c
+++ b/drivers/net/wireless/ath/wil6210/debugfs.c
@@ -1766,7 +1766,7 @@ __acquires(&p->tid_rx_lock) __releases(&p->tid_rx_lock)
 			seq_puts(s, "\n");
 			if (!num_packets)
 				continue;
-			do_div(tx_latency_avg, num_packets);
+			div64_u64(tx_latency_avg, num_packets);
 			seq_printf(s, "Tx/Latency min/avg/max (us): %d/%lld/%d",
 				   p->stats.tx_latency_min_us,
 				   tx_latency_avg,
-- 
2.7.4