linux-kernel - [PATCH v2 12/33] staging: wfx: simplify API coherency check

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Message-Id: <20210913083045.1881321-13-Jerome.Pouiller@silabs.com>
Date:   Mon, 13 Sep 2021 10:30:24 +0200
From:   Jerome Pouiller <Jerome.Pouiller@...abs.com>
To:     devel@...verdev.osuosl.org, linux-wireless@...r.kernel.org
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S . Miller" <davem@...emloft.net>,
        Jérôme Pouiller 
        <jerome.pouiller@...abs.com>
Subject: [PATCH v2 12/33] staging: wfx: simplify API coherency check

From: Jérôme Pouiller <jerome.pouiller@...abs.com>

The 'channel' argument of hif_join() should never be NULL. hif_join()
does not have the responsibility to recover bug of caller. A call to
WARN() at the beginning of the function reminds this constraint to the
developer.

In current code, if the argument channel is NULL, memory leaks. The new
code just emit a warning and does not give the illusion that it is
supported (and indeed a Oops will probably raise a few lines below).

Signed-off-by: Jérôme Pouiller <jerome.pouiller@...abs.com>
---
 drivers/staging/wfx/hif_tx.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/staging/wfx/hif_tx.c b/drivers/staging/wfx/hif_tx.c
index 14b7e047916e..6ffbae32028b 100644
--- a/drivers/staging/wfx/hif_tx.c
+++ b/drivers/staging/wfx/hif_tx.c
@@ -299,10 +299,9 @@ int hif_join(struct wfx_vif *wvif, const struct ieee80211_bss_conf *conf,
 
 	WARN_ON(!conf->beacon_int);
 	WARN_ON(!conf->basic_rates);
+	WARN_ON(!channel);
 	WARN_ON(sizeof(body->ssid) < ssidlen);
 	WARN(!conf->ibss_joined && !ssidlen, "joining an unknown BSS");
-	if (WARN_ON(!channel))
-		return -EINVAL;
 	if (!hif)
 		return -ENOMEM;
 	body->infrastructure_bss_mode = !conf->ibss_joined;
-- 
2.33.0