linux-kernel - Re: [PATCH 2/2] drivers/s390/cio/chsc

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Message-ID: <20081006105227.GA6303@osiris.boeblingen.de.ibm.com>
Date:	Mon, 6 Oct 2008 12:52:27 +0200
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Julia Lawall <julia@...u.dk>
Cc:	schwidefsky@...ibm.com, linux390@...ibm.com,
	linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 2/2] drivers/s390/cio/chsc_sch.c: Correct use of ! and &

On Sat, Oct 04, 2008 at 10:05:47PM +0200, Julia Lawall wrote:
> From: Julia Lawall <julia@...u.dk>
> 
> In commit e6bafba5b4765a5a252f1b8d31cbf6d2459da337, a bug was fixed that
> involved converting !x & y to !(x & y).  The code below shows the same
> pattern, and thus should perhaps be fixed in the same way.  In particular,
> the result of !scsw_stctl(&request->irb.scsw) & SCSW_STCTL_STATUS_PEND is
> always just !scsw_stctl(&request->irb.scsw).
> [...]
> -	if (!scsw_stctl(&request->irb.scsw) & SCSW_STCTL_STATUS_PEND)
> +	if (!(scsw_stctl(&request->irb.scsw) & SCSW_STCTL_STATUS_PEND))
>  		return -EIO;
>  	backed_up = scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHAIN_CHECK;
>  	request->irb.scsw.cmd.cstat &= ~SCHN_STAT_CHAIN_CHECK;

Nice finding. Thank you!
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