linux-kernel - Re: [PATCH v3 13/16] usb: phy: tegra: Keep CPU interrupts enabled

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Message-ID: <20191230203648.GA24135@qmqm.qmqm.pl>
Date:   Mon, 30 Dec 2019 21:36:48 +0100
From:   Michał Mirosław <mirq-linux@...e.qmqm.pl>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Peter Chen <Peter.Chen@....com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Felipe Balbi <balbi@...nel.org>, devicetree@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 13/16] usb: phy: tegra: Keep CPU interrupts enabled

On Sat, Dec 28, 2019 at 11:33:55PM +0300, Dmitry Osipenko wrote:
> There is no good reason for disabling of CPU interrupts in order to
> protect the utmip_pad_count modification.

Since there are sleeping functions called outside of the locked sections,
this should be a mutex instead. OTOH if the spin_lock is to protect register
write against IRQ handler, then the patch is wrong.

[...]
> -	spin_unlock_irqrestore(&utmip_pad_lock, flags);
> +	spin_unlock(&utmip_pad_lock);
>  
>  	clk_disable_unprepare(phy->pad_clk);

Best Regards,
Michał Mirosław