linux-kernel - Re: [PATCH v2 07/10] blktrace: move debugfs file creation to its own function

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Date:   Mon, 20 Apr 2020 13:37:24 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Bart Van Assche <bvanassche@....org>
Cc:     Luis Chamberlain <mcgrof@...nel.org>, axboe@...nel.dk,
        viro@...iv.linux.org.uk, rostedt@...dmis.org, mingo@...hat.com,
        jack@...e.cz, ming.lei@...hat.com, nstange@...e.de,
        akpm@...ux-foundation.org, mhocko@...e.com, yukuai3@...wei.com,
        linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 07/10] blktrace: move debugfs file creation to its own
 function

On Sun, Apr 19, 2020 at 03:55:15PM -0700, Bart Van Assche wrote:
> On 4/19/20 12:45 PM, Luis Chamberlain wrote:
> > +static int blk_trace_create_debugfs_files(struct blk_user_trace_setup *buts,
> > +					  struct dentry *dir,
> > +					  struct blk_trace *bt)
> > +{
> > +	int ret = -EIO;
> > +
> > +	bt->dropped_file = debugfs_create_file("dropped", 0444, dir, bt,
> > +					       &blk_dropped_fops);
> > +
> > +	bt->msg_file = debugfs_create_file("msg", 0222, dir, bt, &blk_msg_fops);
> > +
> > +	bt->rchan = relay_open("trace", dir, buts->buf_size,
> > +				buts->buf_nr, &blk_relay_callbacks, bt);
> > +	if (!bt->rchan)
> > +		return ret;
> > +
> > +	return 0;
> > +}
> 
> How about adding IS_ERR() checks for the debugfs_create_file() return
> values?

No, please no, I have been removing all of that nonsense from the kernel
for the past 3-4 releases.  You should never care about the return value
from that call, just save it off and move on.

as it is, this is correct.

greg k-h