linux-kernel - Re: [PATCH v3] staging: pi433: add debugfs interface

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Date:   Mon, 31 Jan 2022 17:45:28 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     Paulo Miguel Almeida <paulo.miguel.almeida.rodenas@...il.com>,
        realwakka@...il.com, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] staging: pi433: add debugfs interface

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