netdev - [PATCH] ath10k: work around uninitialized vht

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Date:   Mon,  8 Jul 2019 14:50:06 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Kalle Valo <kvalo@...eaurora.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Miaoqing Pan <miaoqing@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Rakesh Pillai <pillair@...eaurora.org>,
        Brian Norris <briannorris@...omium.org>,
        Balaji Pothunoori <bpothuno@...eaurora.org>,
        Wen Gong <wgong@...eaurora.org>,
        Pradeep kumar Chitrapu <pradeepc@...eaurora.org>,
        Sriram R <srirrama@...eaurora.org>, ath10k@...ts.infradead.org,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com
Subject: [PATCH] ath10k: work around uninitialized vht_pfr variable

As clang points out, the vht_pfr is assigned to a struct member
without being initialized in one case:

drivers/net/wireless/ath/ath10k/mac.c:7528:7: error: variable 'vht_pfr' is used uninitialized whenever 'if' condition
      is false [-Werror,-Wsometimes-uninitialized]
                if (!ath10k_mac_can_set_bitrate_mask(ar, band, mask,
                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/net/wireless/ath/ath10k/mac.c:7551:20: note: uninitialized use occurs here
                arvif->vht_pfr = vht_pfr;
                                 ^~~~~~~
drivers/net/wireless/ath/ath10k/mac.c:7528:3: note: remove the 'if' if its condition is always true
                if (!ath10k_mac_can_set_bitrate_mask(ar, band, mask,
                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/net/wireless/ath/ath10k/mac.c:7483:12: note: initialize the variable 'vht_pfr' to silence this warning
        u8 vht_pfr;

Add an explicit but probably incorrect initialization here.
I suspect we want a better fix here, but chose this approach to
illustrate the issue.

Fixes: 8b97b055dc9d ("ath10k: fix failure to set multiple fixed rate")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/net/wireless/ath/ath10k/mac.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c
index e43a566eef77..0606416dc971 100644
--- a/drivers/net/wireless/ath/ath10k/mac.c
+++ b/drivers/net/wireless/ath/ath10k/mac.c
@@ -7541,6 +7541,8 @@ static int ath10k_mac_op_set_bitrate_mask(struct ieee80211_hw *hw,
 								&vht_nss,
 								true);
 			update_bitrate_mask = false;
+		} else {
+			vht_pfr = 0;
 		}
 
 		mutex_lock(&ar->conf_mutex);
-- 
2.20.0