linux-kernel - Re: [PATCH 1/6] tty: n_gsm: Add support for serdev drivers

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Message-ID: <20200501213111.GF37466@atomide.com>
Date:   Fri, 1 May 2020 14:31:11 -0700
From:   Tony Lindgren <tony@...mide.com>
To:     Pavel Machek <pavel@...x.de>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Johan Hovold <johan@...nel.org>, Rob Herring <robh@...nel.org>,
        Alan Cox <gnomes@...rguk.ukuu.org.uk>,
        Lee Jones <lee.jones@...aro.org>, Jiri Slaby <jslaby@...e.cz>,
        Merlijn Wajer <merlijn@...zup.org>,
        Peter Hurley <peter@...leysoftware.com>,
        Sebastian Reichel <sre@...nel.org>,
        linux-serial@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org
Subject: Re: [PATCH 1/6] tty: n_gsm: Add support for serdev drivers

* Pavel Machek <pavel@...x.de> [200501 20:32]:
> > +static struct gsm_dlci *gsd_dlci_get(struct gsm_serdev *gsd, int line,
> > +				     bool allocate)
> > +{
> > +	struct gsm_mux *gsm;
> > +	struct gsm_dlci *dlci;
> > +
> > +	if (!gsd || !gsd->gsm)
> > +		return ERR_PTR(-ENODEV);
> > +
> > +	gsm = gsd->gsm;
> > +
> > +	if (line < 1 || line >= 63)
> > +		return ERR_PTR(-EINVAL);
> > +
> > +	mutex_lock(&gsm->mutex);
> ...
> > +	dlci = gsm_dlci_alloc(gsm, line);
> > +	if (!dlci) {
> > +		gsm = ERR_PTR(-ENOMEM);
> > +		goto unlock;
> 
> dlci = , or you get nice crash.

Ah thanks yeah we return dlci and need to set dlci instead:

	if (!dlci) {
		dlci = ERR_PTR(-ENOMEM);
		goto unlock;
	}

Regards,

Tony