i2c: rcar: remove spinlock

The i2c core has per-adapter locks, so no need to protect again.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
(cherry picked from commit 150b8be3cda54412ad7b54f5392b513b25c0aaa7)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c
index 07256a6..e167841 100644 (file)
--- a/drivers/i2c/busses/i2c-rcar.c
+++ b/drivers/i2c/busses/i2c-rcar.c
@@ -36,7 +36,6 @@
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/slab.h>
-#include <linux/spinlock.h>
 
 /* register offsets */
 #define ICSCR  0x00    /* slave ctrl */
@@ -110,7 +109,6 @@ struct rcar_i2c_priv {
        struct i2c_msg  *msg;
        struct clk *clk;
 
-       spinlock_t lock;
        wait_queue_head_t wait;
 
        int pos;
@@ -394,9 +392,6 @@ static irqreturn_t rcar_i2c_irq(int irq, void *ptr)
        struct device *dev = rcar_i2c_priv_to_dev(priv);
        u32 msr;
 
-       /*-------------- spin lock -----------------*/
-       spin_lock(&priv->lock);
-
        msr = rcar_i2c_read(priv, ICMSR);
 
        /*
@@ -450,9 +445,6 @@ out:
                wake_up(&priv->wait);
        }
 
-       spin_unlock(&priv->lock);
-       /*-------------- spin unlock -----------------*/
-
        return IRQ_HANDLED;
 }
 
@@ -462,21 +454,14 @@ static int rcar_i2c_master_xfer(struct i2c_adapter *adap,
 {
        struct rcar_i2c_priv *priv = i2c_get_adapdata(adap);
        struct device *dev = rcar_i2c_priv_to_dev(priv);
-       unsigned long flags;
        int i, ret, timeout;
 
        pm_runtime_get_sync(dev);
 
-       /*-------------- spin lock -----------------*/
-       spin_lock_irqsave(&priv->lock, flags);
-
        rcar_i2c_init(priv);
        /* start clock */
        rcar_i2c_write(priv, ICCCR, priv->icccr);
 
-       spin_unlock_irqrestore(&priv->lock, flags);
-       /*-------------- spin unlock -----------------*/
-
        ret = rcar_i2c_bus_barrier(priv);
        if (ret < 0)
                goto out;
@@ -488,9 +473,6 @@ static int rcar_i2c_master_xfer(struct i2c_adapter *adap,
                        break;
                }
 
-               /*-------------- spin lock -----------------*/
-               spin_lock_irqsave(&priv->lock, flags);
-
                /* init each data */
                priv->msg       = &msgs[i];
                priv->pos       = 0;
@@ -500,9 +482,6 @@ static int rcar_i2c_master_xfer(struct i2c_adapter *adap,
 
                ret = rcar_i2c_prepare_msg(priv);
 
-               spin_unlock_irqrestore(&priv->lock, flags);
-               /*-------------- spin unlock -----------------*/
-
                if (ret < 0)
                        break;
 
@@ -614,7 +593,6 @@ static int rcar_i2c_probe(struct platform_device *pdev)
 
        irq = platform_get_irq(pdev, 0);
        init_waitqueue_head(&priv->wait);
-       spin_lock_init(&priv->lock);
 
        adap                    = &priv->adap;
        adap->nr                = pdev->id;