linux-kernel - Re: [PATCH] staging: rtl8192u: Remove an unnecessary NULL check

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Date:   Wed, 22 May 2019 10:04:18 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devel@...verdev.osuosl.org,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-kernel@...r.kernel.org,
        John Whitmore <johnfwhitmore@...il.com>,
        clang-built-linux@...glegroups.com
Subject: Re: [PATCH] staging: rtl8192u: Remove an unnecessary NULL check

On Tue, May 21, 2019 at 10:42:21AM -0700, Nathan Chancellor wrote:
> Clang warns:
> 
> drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c:2663:47: warning:
> address of array 'param->u.wpa_ie.data' will always evaluate to 'true'
> [-Wpointer-bool-conversion]
>             (param->u.wpa_ie.len && !param->u.wpa_ie.data))
>                                     ~~~~~~~~~~~~~~~~~^~~~
> 
> This was exposed by commit deabe03523a7 ("Staging: rtl8192u: ieee80211:
> Use !x in place of NULL comparisons") because we disable the warning
> that would have pointed out the comparison against NULL is also false:
> 

Heh.  Weird.  Why would people disable one and not the other?

regards,
dan carpenter