linux-kernel - Re: [alsa-devel] linux-4.6-rc4/sound/pci/ens1370.c:1551: possible bad expression ?

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Message-ID: <57187578.2010609@ladisch.de>
Date:	Thu, 21 Apr 2016 08:38:48 +0200
From:	Clemens Ladisch <clemens@...isch.de>
To:	David Binderman <dcb314@...mail.com>,
	"perex@...ex.cz" <perex@...ex.cz>,
	"tiwai@...e.com" <tiwai@...e.com>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [alsa-devel] linux-4.6-rc4/sound/pci/ens1370.c:1551: possible bad
	expression ?

David Binderman wrote:
> [linux-4.6-rc4/sound/pci/ens1370.c:1551]: (style) Expression '(X & 0xf0000)>= 0x4' is always false.

What tool generated this message?

> Source code is
>
>     if ((ensoniq->ctrl & ES_1371_GPIO_OUTM)>= 4)
>         val = 1;

This message is wrong; it is certainly possible for this to be true.

However, there is a different bug: 4 must be ES_1371_GPIO_OUT(4).


Regards,
Clemens