linux-kernel - Re: [PATCH] i2c: mux: demux-pinctrl: do not deactivate a master that is not active

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Message-ID: <Yh/gHSaRNs9Z8La2@ninjato>
Date:   Wed, 2 Mar 2022 22:22:37 +0100
From:   Wolfram Sang <wsa+renesas@...g-engineering.com>
To:     Peter Rosin <peda@...ntia.se>,
        "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] i2c: mux: demux-pinctrl: do not deactivate a master that
 is not active

On Wed, Mar 02, 2022 at 10:17:20PM +0100, Wolfram Sang wrote:
> 
> > Attempting to rollback the activation of the current master when
> > the current master has not been activated is bad. priv->cur_chan
> 
> But the master is activated?
> 
> 259         /* switch to first parent as active master */
> 260         i2c_demux_activate_master(priv, 0);
> 
> Or am I missing something? :)

But _this_ code is affected by the problem you describe, or?

237                 if (!adap_np) {
238                         dev_err(&pdev->dev, "can't get phandle for parent %d\n", i);
239                         err = -ENOENT;
240                         goto err_rollback;
241                 }


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