linux-kernel - [PATCH] media: cx18: Don't check for address of video

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Date:   Fri, 21 Sep 2018 12:57:37 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Andy Walls <awalls@...metrocast.net>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nathan Chancellor <natechancellor@...il.com>
Subject: [PATCH] media: cx18: Don't check for address of video_dev

Clang warns that the address of a pointer will always evaluated as true
in a boolean context.

drivers/media/pci/cx18/cx18-driver.c:1255:23: warning: address of
'cx->streams[i].video_dev' will always evaluate to 'true'
[-Wpointer-bool-conversion]
                if (&cx->streams[i].video_dev)
                ~~   ~~~~~~~~~~~~~~~^~~~~~~~~
1 warning generated.

Presumably, the contents of video_dev should have been checked, not the
address. This check has been present since 2009, introduced by commit
21a278b85d3c ("V4L/DVB (11619): cx18: Simplify the work handler for
outgoing mailbox commands")

Reported-by: Nick Desaulniers <ndesaulniers@...gle.com>
Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
---

Alternatively, this if statement could just be removed since it has
evaluated to true since 2009 and I assume some issue with this would
have been discovered by now.

 drivers/media/pci/cx18/cx18-driver.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/pci/cx18/cx18-driver.c b/drivers/media/pci/cx18/cx18-driver.c
index 56763c4ea1a7..753a37c7100a 100644
--- a/drivers/media/pci/cx18/cx18-driver.c
+++ b/drivers/media/pci/cx18/cx18-driver.c
@@ -1252,7 +1252,7 @@ static void cx18_cancel_out_work_orders(struct cx18 *cx)
 {
 	int i;
 	for (i = 0; i < CX18_MAX_STREAMS; i++)
-		if (&cx->streams[i].video_dev)
+		if (cx->streams[i].video_dev)
 			cancel_work_sync(&cx->streams[i].out_work_order);
 }
 
-- 
2.19.0