From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201])
	(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
	(No client certificate requested)
	by smtp.subspace.kernel.org (Postfix) with ESMTPS id 108332C9C
	for <linux-staging@lists.linux.dev>; Mon, 31 Jan 2022 16:45:30 +0000 (UTC)
Received: by smtp.kernel.org (Postfix) with ESMTPSA id 51B31C340E8;
	Mon, 31 Jan 2022 16:45:30 +0000 (UTC)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org;
	s=korg; t=1643647530;
	bh=9MSg0aCS8sLQUyOSWxm+SNt05q8CIo7n+iLqnp0iDS8=;
	h=Date:From:To:Cc:Subject:References:In-Reply-To:From;
	b=KR83EWu6vecCqxOW80b5Y4wdxtsI8kTEhZUgY65a7ew6mCu69HO6ALZ4m8zo3rXbO
	 HlKYKd7lJcF6aqlyNEn7Ugi4t3OZE2UxbqPMGXTbRHXa9ugO742ZM6xeA4SKh17DQ6
	 l0CkxaOFkQ9+yBOBc7F8DTGIQHELqa/dv/t5F/Os=
Date: Mon, 31 Jan 2022 17:45:28 +0100
From: Greg KH <gregkh@linuxfoundation.org>
To: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Paulo Miguel Almeida <paulo.miguel.almeida.rodenas@gmail.com>,
	realwakka@gmail.com, linux-staging@lists.linux.dev,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3] staging: pi433: add debugfs interface
Message-ID: <YfgSKNlCm/3DnRmD@kroah.com>
References: <20220126132116.GA1951@kadam>
 <YfX+llwDWZZMz+NY@mail.google.com>
 <20220131134558.GL1951@kadam>
Precedence: bulk
X-Mailing-List: linux-staging@lists.linux.dev
List-Id: <linux-staging.lists.linux.dev>
List-Subscribe: <mailto:linux-staging+subscribe@lists.linux.dev>
List-Unsubscribe: <mailto:linux-staging+unsubscribe@lists.linux.dev>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20220131134558.GL1951@kadam>

On Mon, Jan 31, 2022 at 04:45:58PM +0300, Dan Carpenter wrote:
> On Sun, Jan 30, 2022 at 03:57:26PM +1300, Paulo Miguel Almeida wrote:
> > @@ -1102,12 +1104,75 @@ static const struct file_operations pi433_fops = {
> >  	.llseek =	no_llseek,
> >  };
> >  
> > +static int pi433_debugfs_regs_show(struct seq_file *m, void *p)
> > +{
> > +	struct pi433_device *dev;
> > +	u8 reg_data[114];
> > +	int i;
> > +	char *fmt = "0x%02x, 0x%02x\n";
> > +	int ret = 0;
> 
> No need to initialize.  Bogus initializers just disable ten thousand
> person hours spent developing static analysis.
> 
> > +
> > +	dev = m->private;
> > +
> > +	mutex_lock(&dev->tx_fifo_lock);
> > +	mutex_lock(&dev->rx_lock);
> > +
> > +	// wait for on-going operations to finish
> > +	ret = wait_event_interruptible(dev->rx_wait_queue, !dev->tx_active);
> > +	if (ret)
> > +		return ret;
> 
> Drop the two mutexes before returning.

Ick, I missed that.  I'll go drop this patch from my tree now, good
catch.

greg k-h