linux-kernel - [PATCH v2 5/5] clk: imx: gate2: Add locking in is

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Message-Id: <1603889942-27026-6-git-send-email-abel.vesa@nxp.com>
Date:   Wed, 28 Oct 2020 14:59:02 +0200
From:   Abel Vesa <abel.vesa@....com>
To:     Mike Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Lucas Stach <l.stach@...gutronix.de>,
        Rob Herring <robh@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <kernel@...gutronix.de>,
        Fabio Estevam <fabio.estevam@....com>,
        Anson Huang <anson.huang@....com>,
        Jacky Bai <ping.bai@....com>, Peng Fan <peng.fan@....com>,
        Dong Aisheng <aisheng.dong@....com>
Cc:     NXP Linux Team <linux-imx@....com>,
        linux-arm-kernel@...ts.infradead.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        Abel Vesa <abel.vesa@....com>
Subject: [PATCH v2 5/5] clk: imx: gate2: Add locking in is_enabled op

Protect against enabling/disabling the gate while we're
checking if it is enabled.

Signed-off-by: Abel Vesa <abel.vesa@....com>
---
 drivers/clk/imx/clk-gate2.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/imx/clk-gate2.c b/drivers/clk/imx/clk-gate2.c
index 7e4b5e8..480a184 100644
--- a/drivers/clk/imx/clk-gate2.c
+++ b/drivers/clk/imx/clk-gate2.c
@@ -101,9 +101,17 @@ static int clk_gate2_reg_is_enabled(void __iomem *reg, u8 bit_idx,
 static int clk_gate2_is_enabled(struct clk_hw *hw)
 {
 	struct clk_gate2 *gate = to_clk_gate2(hw);
+	unsigned long flags;
+	int ret = 0;
 
-	return clk_gate2_reg_is_enabled(gate->reg, gate->bit_idx,
+	spin_lock_irqsave(gate->lock, flags);
+
+	ret = clk_gate2_reg_is_enabled(gate->reg, gate->bit_idx,
 					gate->cgr_val, gate->cgr_mask);
+
+	spin_unlock_irqrestore(gate->lock, flags);
+
+	return ret;
 }
 
 static void clk_gate2_disable_unused(struct clk_hw *hw)
-- 
2.7.4