linux-kernel - [PATCH 4.19 140/148] staging: greybus: fix get_channel_from

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Message-ID: <20240324235012.1356413-141-sashal@kernel.org>
Date: Sun, 24 Mar 2024 19:50:04 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Dan Carpenter <dan.carpenter@...aro.org>,
	Rui Miguel Silva <rmfrfs@...il.com>,
	Alex Elder <elder@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 140/148] staging: greybus: fix get_channel_from_mode() failure path

From: Dan Carpenter <dan.carpenter@...aro.org>

[ Upstream commit 34164202a5827f60a203ca9acaf2d9f7d432aac8 ]

The get_channel_from_mode() function is supposed to return the channel
which matches the mode.  But it has a bug where if it doesn't find a
matching channel then it returns the last channel.  It should return
NULL instead.

Also remove an unnecessary NULL check on "channel".

Fixes: 2870b52bae4c ("greybus: lights: add lights implementation")
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
Reviewed-by: Rui Miguel Silva <rmfrfs@...il.com>
Reviewed-by: Alex Elder <elder@...aro.org>
Link: https://lore.kernel.org/r/379c0cb4-39e0-4293-8a18-c7b1298e5420@moroto.mountain
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/staging/greybus/light.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/greybus/light.c b/drivers/staging/greybus/light.c
index db06cd544af58..8c5819d1e1abe 100644
--- a/drivers/staging/greybus/light.c
+++ b/drivers/staging/greybus/light.c
@@ -102,15 +102,15 @@ static struct led_classdev *get_channel_cdev(struct gb_channel *channel)
 static struct gb_channel *get_channel_from_mode(struct gb_light *light,
 						u32 mode)
 {
-	struct gb_channel *channel = NULL;
+	struct gb_channel *channel;
 	int i;
 
 	for (i = 0; i < light->channels_count; i++) {
 		channel = &light->channels[i];
-		if (channel && channel->mode == mode)
-			break;
+		if (channel->mode == mode)
+			return channel;
 	}
-	return channel;
+	return NULL;
 }
 
 static int __gb_lights_flash_intensity_set(struct gb_channel *channel,
-- 
2.43.0