linux-kernel - Re: [PATCH] logical-bitwise & confusion in se401

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Date:	Thu, 13 Mar 2008 23:58:37 +0100
From:	Roel Kluin <12o3l@...cali.nl>
To:	Rik van Riel <riel@...hat.com>
CC:	Mauro Carvalho Chehab <mchehab@...radead.org>, pe1rxq@...at.org,
	linux-usb@...r.kernel.org, video4linux-list@...hat.com,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] logical-bitwise & confusion in se401_init()

Rik van Riel wrote:
> On Thu, 13 Mar 2008 16:51:29 +0100
> Roel Kluin <12o3l@...cali.nl> wrote:
> 
>> -	if (!cp[2] && SE401_FORMAT_BAYER) {
>> +	if (!cp[2] & SE401_FORMAT_BAYER) {
>>  		err("Bayer format not supported!");
>>  		return 1;
>>  	}
> 
> Would it be better to put in some additional parenthesis?
> 
> 	if (!(cp[2] & SE401_FORMAT_BAYER)) {
> 
yes of course, thanks for catching that.
---
logical-bitwise & confusion

Signed-off-by: Roel Kluin <12o3l@...cali.nl>
---
diff --git a/drivers/media/video/se401.c b/drivers/media/video/se401.c
index d5d7d6c..9e8b521 100644
--- a/drivers/media/video/se401.c
+++ b/drivers/media/video/se401.c
@@ -1279,7 +1279,7 @@ static int se401_init(struct usb_se401 *se401, int button)
 	rc=se401_sndctrl(0, se401, SE401_REQ_GET_HEIGHT, 0, cp, sizeof(cp));
 	se401->cheight=cp[0]+cp[1]*256;
 
-	if (!cp[2] && SE401_FORMAT_BAYER) {
+	if (!(cp[2] & SE401_FORMAT_BAYER)) {
 		err("Bayer format not supported!");
 		return 1;
 	}
--
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