linux-kernel - Re: [PATCH RESEND] usb: gadget: udc: bdc: Remove unnecessary NULL checks in bdc_req

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Message-ID: <87pncu2to7.fsf@kernel.org>
Date:   Mon, 30 Mar 2020 10:22:48 +0300
From:   Felipe Balbi <balbi@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Nathan Chancellor <natechancellor@...il.com>,
        Ashwini Pahuja <ashwini.linux@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com
Subject: Re: [PATCH RESEND] usb: gadget: udc: bdc: Remove unnecessary NULL checks in bdc_req_complete

Hi,

Greg Kroah-Hartman <gregkh@...uxfoundation.org> writes:
>> >> > When building with Clang + -Wtautological-pointer-compare:
>> >> >
>> >> > drivers/usb/gadget/udc/bdc/bdc_ep.c:543:28: warning: comparison of
>> >> > address of 'req->queue' equal to a null pointer is always false
>> >> > [-Wtautological-pointer-compare]
>> >> >         if (req == NULL  || &req->queue == NULL || &req->usb_req == NULL)
>> >> >                              ~~~~~^~~~~    ~~~~
>> >> > drivers/usb/gadget/udc/bdc/bdc_ep.c:543:51: warning: comparison of
>> >> > address of 'req->usb_req' equal to a null pointer is always false
>> >> > [-Wtautological-pointer-compare]
>> >> >         if (req == NULL  || &req->queue == NULL || &req->usb_req == NULL)
>> >> >                                                     ~~~~~^~~~~~~    ~~~~
>> >> > 2 warnings generated.
>> >> >
>> >> > As it notes, these statements will always evaluate to false so remove
>> >> > them.
>> >> >
>> >> > Fixes: efed421a94e6 ("usb: gadget: Add UDC driver for Broadcom USB3.0 device controller IP BDC")
>> >> > Link: https://github.com/ClangBuiltLinux/linux/issues/749
>> >> > Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
>> >> 
>> >> It's now in my queue for v5.8. It doesn't really look like a bug fix, so
>> >> it's not going in during v5.7-rc
>> >> 
>> >> -- 
>> >> balbi
>> >
>> > Thank you for picking it up. It would be nice to see it in 5.7 since
>> > we're enabling this warning and this is one of two outstanding
>> > instances in -next and the other one's patch has been picked up plus the
>> > patch itself is rather benign. Not to mention that I did send this patch
>> > back in October. However, when it is merged into Linus' tree is
>> > ultimately your call so I won't argue as long as it gets there
>> > eventually.
>> 
>> If Greg's okay with this patch going in during v5.7-rc, I can send it as
>> a fix, no worries. Greg?
>
> Yes, clang build warnings fixes are valid fixes for the -rc period, and
> I take them into stable where needed as well.

Thanks for confirming, Greg. I'll move the commit to my testing/fixes

-- 
balbi

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