netdev - [PATCH] rtlwifi: Remove unnecessary NULL check in rtl_regd

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Date:   Tue, 22 Oct 2019 17:47:03 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Ping-Ke Shih <pkshih@...ltek.com>,
        Kalle Valo <kvalo@...eaurora.org>
Cc:     Larry Finger <Larry.Finger@...inger.net>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com,
        Nathan Chancellor <natechancellor@...il.com>
Subject: [PATCH] rtlwifi: Remove unnecessary NULL check in rtl_regd_init

When building with Clang + -Wtautological-pointer-compare:

drivers/net/wireless/realtek/rtlwifi/regd.c:389:33: warning: comparison
of address of 'rtlpriv->regd' equal to a null pointer is always false
[-Wtautological-pointer-compare]
        if (wiphy == NULL || &rtlpriv->regd == NULL)
                              ~~~~~~~~~^~~~    ~~~~
1 warning generated.

The address of an array member is never NULL unless it is the first
struct member so remove the unnecessary check. This was addressed in
the staging version of the driver in commit f986978b32b3 ("Staging:
rtlwifi: remove unnecessary NULL check").

While we are here, fix the following checkpatch warning:

CHECK: Comparison to NULL could be written "!wiphy"
35: FILE: drivers/net/wireless/realtek/rtlwifi/regd.c:389:
+       if (wiphy == NULL)

Fixes: 0c8173385e54 ("rtl8192ce: Add new driver")
Link:https://github.com/ClangBuiltLinux/linux/issues/750
Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
---
 drivers/net/wireless/realtek/rtlwifi/regd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/realtek/rtlwifi/regd.c b/drivers/net/wireless/realtek/rtlwifi/regd.c
index c10432cd703e..8be31e0ad878 100644
--- a/drivers/net/wireless/realtek/rtlwifi/regd.c
+++ b/drivers/net/wireless/realtek/rtlwifi/regd.c
@@ -386,7 +386,7 @@ int rtl_regd_init(struct ieee80211_hw *hw,
 	struct wiphy *wiphy = hw->wiphy;
 	struct country_code_to_enum_rd *country = NULL;
 
-	if (wiphy == NULL || &rtlpriv->regd == NULL)
+	if (!wiphy)
 		return -EINVAL;
 
 	/* init country_code from efuse channel plan */
-- 
2.23.0