linux-kernel - [PATCH] ASoC: wcd934x: Remove some unnecessary NULL checks

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:   Mon,  3 Feb 2020 23:01:44 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>
Cc:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com,
        Nathan Chancellor <natechancellor@...il.com>
Subject: [PATCH] ASoC: wcd934x: Remove some unnecessary NULL checks

Clang warns:

../sound/soc/codecs/wcd934x.c:1886:11: warning: address of array
'wcd->rx_chs' will always evaluate to 'true' [-Wpointer-bool-conversion]
        if (wcd->rx_chs) {
        ~~  ~~~~~^~~~~~
../sound/soc/codecs/wcd934x.c:1894:11: warning: address of array
'wcd->tx_chs' will always evaluate to 'true' [-Wpointer-bool-conversion]
        if (wcd->tx_chs) {
        ~~  ~~~~~^~~~~~
2 warnings generated.

Arrays that are in the middle of a struct are never NULL so they don't
need a check like this.

Fixes: a61f3b4f476e ("ASoC: wcd934x: add support to wcd9340/wcd9341 codec")
Link: https://github.com/ClangBuiltLinux/linux/issues/854
Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
---

Also, turns out this was fixed in the wcd9335 driver in
commit d22b4117538d ("ASoC: wcd9335: remove some unnecessary
NULL checks")...

 sound/soc/codecs/wcd934x.c | 20 ++++++++------------
 1 file changed, 8 insertions(+), 12 deletions(-)

diff --git a/sound/soc/codecs/wcd934x.c b/sound/soc/codecs/wcd934x.c
index 158e878abd6c..e780ecd554d2 100644
--- a/sound/soc/codecs/wcd934x.c
+++ b/sound/soc/codecs/wcd934x.c
@@ -1883,20 +1883,16 @@ static int wcd934x_set_channel_map(struct snd_soc_dai *dai,
 		return -EINVAL;
 	}
 
-	if (wcd->rx_chs) {
-		wcd->num_rx_port = rx_num;
-		for (i = 0; i < rx_num; i++) {
-			wcd->rx_chs[i].ch_num = rx_slot[i];
-			INIT_LIST_HEAD(&wcd->rx_chs[i].list);
-		}
+	wcd->num_rx_port = rx_num;
+	for (i = 0; i < rx_num; i++) {
+		wcd->rx_chs[i].ch_num = rx_slot[i];
+		INIT_LIST_HEAD(&wcd->rx_chs[i].list);
 	}
 
-	if (wcd->tx_chs) {
-		wcd->num_tx_port = tx_num;
-		for (i = 0; i < tx_num; i++) {
-			wcd->tx_chs[i].ch_num = tx_slot[i];
-			INIT_LIST_HEAD(&wcd->tx_chs[i].list);
-		}
+	wcd->num_tx_port = tx_num;
+	for (i = 0; i < tx_num; i++) {
+		wcd->tx_chs[i].ch_num = tx_slot[i];
+		INIT_LIST_HEAD(&wcd->tx_chs[i].list);
 	}
 
 	return 0;
-- 
2.25.0