linux-kernel - Re: [PATCH v2 2/2] clk: aspeed: Prevent reset if clock is enabled

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Message-ID: <CAARXrtnQn-rbUc_Ykdn5dpK9fO+jMYFR=ocmkQweBxKQY4L2rg@mail.gmail.com>
Date:   Fri, 9 Mar 2018 11:23:08 +0800
From:   Lei YU <mine260309@...il.com>
To:     Eddie James <eajames@...ux.vnet.ibm.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-clk@...r.kernel.org, Joel Stanley <joel@....id.au>,
        Michael Turquette <mturquette@...libre.com>, sboyd@...nel.org,
        Ryan Chen <ryan_chen@...eedtech.com>
Subject: Re: [PATCH v2 2/2] clk: aspeed: Prevent reset if clock is enabled

>  static int aspeed_clk_enable(struct clk_hw *hw)
>  {
>         struct aspeed_clk_gate *gate = to_aspeed_clk_gate(hw);
> @@ -215,6 +227,11 @@ static int aspeed_clk_enable(struct clk_hw *hw)
>
>         spin_lock_irqsave(gate->lock, flags);
>
> +       if (aspeed_clk_is_enabled(hw)) {
> +               spin_unlock_irqrestore(gate->lock, flags);
> +               return 0;
> +       }
> +

I think this piece of code can be run before spin_lock_irqsave(), so it is
able to just return without spin_unlock_irqrestore()?