linux-kernel - Re: [PATCH V5 08/20] rtla: Helper functions for rtla

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Message-ID: <20211026122614.017844da@gandalf.local.home>
Date:   Tue, 26 Oct 2021 12:26:14 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Tao Zhou <tao.zhou@...ux.dev>
Cc:     Daniel Bristot de Oliveira <bristot@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Tom Zanussi <zanussi@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Clark Williams <williams@...hat.com>,
        John Kacur <jkacur@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        linux-rt-users@...r.kernel.org, linux-trace-devel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V5 08/20] rtla: Helper functions for rtla

On Wed, 27 Oct 2021 00:22:04 +0800
Tao Zhou <tao.zhou@...ux.dev> wrote:

> > +	do {
> > +		retval = read(in_fd, buffer, sizeof(buffer));
> > +		if (read <= 0)  
> 
> check "retval" not read. Like:
> 
>   if (retval <= 0)

OUCH! Good check.

Daniel, did that not produce any warnings??

-- Steve


> 
> > +			goto out_close;
> > +
> > +		retval = write(out_fd, buffer, retval);
> > +		if (retval < 0)
> > +			goto out_close;
> > +	} while (retval > 0);