linux-kernel - [PATCH v3 12/16] usb: phy: tegra: Move utmip_pad

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Date:   Sat, 28 Dec 2019 23:33:54 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     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>
Cc:     devicetree@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 12/16] usb: phy: tegra: Move utmip_pad_count checking under lock

It's unlikely that two drivers could manage PHY's state simultaneously in
practice, nevertheless the utmip_pad_count checking should be under lock,
for consistency.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/usb/phy/phy-tegra-usb.c | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/drivers/usb/phy/phy-tegra-usb.c b/drivers/usb/phy/phy-tegra-usb.c
index f7e7df812f83..72825d207840 100644
--- a/drivers/usb/phy/phy-tegra-usb.c
+++ b/drivers/usb/phy/phy-tegra-usb.c
@@ -351,30 +351,31 @@ static int utmip_pad_power_off(struct tegra_usb_phy *phy)
 	void __iomem *base = phy->pad_regs;
 	unsigned long flags;
 	u32 val;
-	int err;
+	int ret;
+
+	ret = clk_prepare_enable(phy->pad_clk);
+	if (ret)
+		return ret;
+
+	spin_lock_irqsave(&utmip_pad_lock, flags);
 
 	if (!utmip_pad_count) {
 		dev_err(phy->u_phy.dev, "UTMIP pad already powered off\n");
-		return -EINVAL;
+		ret = -EINVAL;
+		goto ulock;
 	}
 
-	err = clk_prepare_enable(phy->pad_clk);
-	if (err)
-		return err;
-
-	spin_lock_irqsave(&utmip_pad_lock, flags);
-
 	if (--utmip_pad_count == 0) {
 		val = readl_relaxed(base + UTMIP_BIAS_CFG0);
 		val |= UTMIP_OTGPD | UTMIP_BIASPD;
 		writel_relaxed(val, base + UTMIP_BIAS_CFG0);
 	}
-
+ulock:
 	spin_unlock_irqrestore(&utmip_pad_lock, flags);
 
 	clk_disable_unprepare(phy->pad_clk);
 
-	return 0;
+	return ret;
 }
 
 static int utmi_wait_register(void __iomem *reg, u32 mask, u32 result)
-- 
2.24.0