linux-kernel - [PATCH net] wifi: airo: avoid uninitialized warning in airo_get

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Message-ID: <20230709133154.26206-1-rdunlap@infradead.org>
Date:   Sun,  9 Jul 2023 06:31:54 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     linux-kernel@...r.kernel.org
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Kalle Valo <kvalo@...nel.org>, linux-wireless@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org
Subject: [PATCH net] wifi: airo: avoid uninitialized warning in airo_get_rate()

Quieten a gcc (11.3.0) build error or warning by checking the function
call status and returning -EBUSY if the function call failed.
This is similar to what several other wireless drivers do for the
SIOCGIWRATE ioctl call when there is a locking problem.

drivers/net/wireless/cisco/airo.c: error: 'status_rid.currentXmitRate' is used uninitialized [-Werror=uninitialized]

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
Reported-by: Geert Uytterhoeven <geert@...ux-m68k.org>
Link: lore.kernel.org/r/39abf2c7-24a-f167-91da-ed4c5435d1c4@...ux-m68k.org
Cc: Kalle Valo <kvalo@...nel.org>
Cc: linux-wireless@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Eric Dumazet <edumazet@...gle.com>
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org
---
 drivers/net/wireless/cisco/airo.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff -- a/drivers/net/wireless/cisco/airo.c b/drivers/net/wireless/cisco/airo.c
--- a/drivers/net/wireless/cisco/airo.c
+++ b/drivers/net/wireless/cisco/airo.c
@@ -6157,8 +6157,11 @@ static int airo_get_rate(struct net_devi
 	struct iw_param *vwrq = &wrqu->bitrate;
 	struct airo_info *local = dev->ml_priv;
 	StatusRid status_rid;		/* Card status info */
+	int ret;
 
-	readStatusRid(local, &status_rid, 1);
+	ret = readStatusRid(local, &status_rid, 1);
+	if (ret)
+		return -EBUSY;
 
 	vwrq->value = le16_to_cpu(status_rid.currentXmitRate) * 500000;
 	/* If more than one rate, set auto */