From: Wolfram Sang <wsa@the-dreams.de> To: linux-i2c@vger.kernel.org Cc: linux-sh@vger.kernel.org, Magnus Damm <magnus.damm@gmail.com>, Simon Horman <horms@verge.net.au>, Laurent Pinchart <laurent.pinchart@ideasonboard.com>, Geert Uytterhoeven <geert@linux-m68k.org>, Wolfram Sang <wsa@the-dreams.de>, Kuninori Morimoto <kuninori.morimoto.gx@gmail.com>, Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Subject: [PATCH v3 04/11] i2c: rcar: remove spinlock Date: Thu, 19 Nov 2015 15:56:44 +0000 [thread overview] Message-ID: <1447948611-2615-5-git-send-email-wsa@the-dreams.de> (raw) In-Reply-To: <1447948611-2615-1-git-send-email-wsa@the-dreams.de> From: Wolfram Sang <wsa+renesas@sang-engineering.com> After making sure to reinit the HW and clear interrupts in the timeout case, we know that interrupts are always disabled in the sections protected by the spinlock. Thus, we can simply remove it which is a preparation for further refactoring. While here, rename the timeout variable to time_left which is way more readable. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> --- drivers/i2c/busses/i2c-rcar.c | 23 ++++------------------- 1 file changed, 4 insertions(+), 19 deletions(-) diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c index 746406923a5825..0f2dc74ab8bcc1 100644 --- a/drivers/i2c/busses/i2c-rcar.c +++ b/drivers/i2c/busses/i2c-rcar.c @@ -33,7 +33,6 @@ #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; @@ -429,9 +427,6 @@ static irqreturn_t rcar_i2c_irq(int irq, void *ptr) irqreturn_t result = IRQ_HANDLED; u32 msr; - /*-------------- spin lock -----------------*/ - spin_lock(&priv->lock); - if (rcar_i2c_slave_irq(priv)) goto exit; @@ -478,9 +473,6 @@ out: } exit: - spin_unlock(&priv->lock); - /*-------------- spin unlock -----------------*/ - return result; } @@ -490,9 +482,8 @@ 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; - long timeout; + long time_left; pm_runtime_get_sync(dev); @@ -507,9 +498,6 @@ 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; @@ -519,13 +507,11 @@ static int rcar_i2c_master_xfer(struct i2c_adapter *adap, rcar_i2c_prepare_msg(priv); - spin_unlock_irqrestore(&priv->lock, flags); - /*-------------- spin unlock -----------------*/ - - timeout = wait_event_timeout(priv->wait, + time_left = wait_event_timeout(priv->wait, rcar_i2c_flags_has(priv, ID_DONE), adap->timeout); - if (!timeout) { + if (!time_left) { + rcar_i2c_init(priv); ret = -ETIMEDOUT; break; } @@ -656,7 +642,6 @@ 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; -- 2.1.4
WARNING: multiple messages have this Message-ID (diff)
From: Wolfram Sang <wsa@the-dreams.de> To: linux-i2c@vger.kernel.org Cc: linux-sh@vger.kernel.org, Magnus Damm <magnus.damm@gmail.com>, Simon Horman <horms@verge.net.au>, Laurent Pinchart <laurent.pinchart@ideasonboard.com>, Geert Uytterhoeven <geert@linux-m68k.org>, Wolfram Sang <wsa@the-dreams.de>, Kuninori Morimoto <kuninori.morimoto.gx@gmail.com>, Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Subject: [PATCH v3 04/11] i2c: rcar: remove spinlock Date: Thu, 19 Nov 2015 16:56:44 +0100 [thread overview] Message-ID: <1447948611-2615-5-git-send-email-wsa@the-dreams.de> (raw) In-Reply-To: <1447948611-2615-1-git-send-email-wsa@the-dreams.de> From: Wolfram Sang <wsa+renesas@sang-engineering.com> After making sure to reinit the HW and clear interrupts in the timeout case, we know that interrupts are always disabled in the sections protected by the spinlock. Thus, we can simply remove it which is a preparation for further refactoring. While here, rename the timeout variable to time_left which is way more readable. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> --- drivers/i2c/busses/i2c-rcar.c | 23 ++++------------------- 1 file changed, 4 insertions(+), 19 deletions(-) diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c index 746406923a5825..0f2dc74ab8bcc1 100644 --- a/drivers/i2c/busses/i2c-rcar.c +++ b/drivers/i2c/busses/i2c-rcar.c @@ -33,7 +33,6 @@ #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; @@ -429,9 +427,6 @@ static irqreturn_t rcar_i2c_irq(int irq, void *ptr) irqreturn_t result = IRQ_HANDLED; u32 msr; - /*-------------- spin lock -----------------*/ - spin_lock(&priv->lock); - if (rcar_i2c_slave_irq(priv)) goto exit; @@ -478,9 +473,6 @@ out: } exit: - spin_unlock(&priv->lock); - /*-------------- spin unlock -----------------*/ - return result; } @@ -490,9 +482,8 @@ 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; - long timeout; + long time_left; pm_runtime_get_sync(dev); @@ -507,9 +498,6 @@ 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; @@ -519,13 +507,11 @@ static int rcar_i2c_master_xfer(struct i2c_adapter *adap, rcar_i2c_prepare_msg(priv); - spin_unlock_irqrestore(&priv->lock, flags); - /*-------------- spin unlock -----------------*/ - - timeout = wait_event_timeout(priv->wait, + time_left = wait_event_timeout(priv->wait, rcar_i2c_flags_has(priv, ID_DONE), adap->timeout); - if (!timeout) { + if (!time_left) { + rcar_i2c_init(priv); ret = -ETIMEDOUT; break; } @@ -656,7 +642,6 @@ 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; -- 2.1.4
next prev parent reply other threads:[~2015-11-19 15:56 UTC|newest] Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-11-19 15:56 [PATCH v3 00/11] i2c: rcar: tackle race conditions in the driver Wolfram Sang 2015-11-19 15:56 ` Wolfram Sang 2015-11-19 15:56 ` [PATCH v3 01/11] i2c: rcar: make sure clocks are on when doing clock calculation Wolfram Sang 2015-11-19 15:56 ` Wolfram Sang 2015-11-19 15:56 ` [PATCH v3 02/11] i2c: rcar: rework hw init Wolfram Sang 2015-11-19 15:56 ` Wolfram Sang 2015-11-19 15:56 ` [PATCH v3 03/11] i2c: rcar: remove unused IOERROR state Wolfram Sang 2015-11-19 15:56 ` Wolfram Sang 2015-11-19 15:56 ` Wolfram Sang [this message] 2015-11-19 15:56 ` [PATCH v3 04/11] i2c: rcar: remove spinlock Wolfram Sang 2015-11-19 15:56 ` [PATCH v3 05/11] i2c: rcar: refactor setup of a msg Wolfram Sang 2015-11-19 15:56 ` Wolfram Sang 2015-11-19 15:56 ` [PATCH v3 06/11] i2c: rcar: init new messages in irq Wolfram Sang 2015-11-19 15:56 ` Wolfram Sang 2015-11-19 15:56 ` [PATCH v3 07/11] i2c: rcar: don't issue stop when HW does it automatically Wolfram Sang 2015-11-19 15:56 ` Wolfram Sang 2015-11-19 15:56 ` [PATCH v3 08/11] i2c: rcar: check master irqs before slave irqs Wolfram Sang 2015-11-19 15:56 ` Wolfram Sang 2015-11-19 15:56 ` [PATCH v3 09/11] i2c: rcar: revoke START request early Wolfram Sang 2015-11-19 15:56 ` Wolfram Sang 2016-03-31 21:02 ` Sergei Shtylyov 2016-03-31 21:02 ` Sergei Shtylyov 2016-03-31 22:48 ` Wolfram Sang 2016-03-31 22:48 ` Wolfram Sang 2016-04-01 19:55 ` Sergei Shtylyov 2016-04-01 19:55 ` Sergei Shtylyov 2016-04-01 20:14 ` Wolfram Sang 2016-04-01 20:14 ` Wolfram Sang 2016-04-01 23:05 ` Sergei Shtylyov 2016-04-01 23:05 ` Sergei Shtylyov 2016-04-02 7:27 ` Wolfram Sang 2016-04-02 7:27 ` Wolfram Sang 2016-04-02 12:51 ` Sergei Shtylyov 2016-04-02 12:51 ` Sergei Shtylyov 2016-04-03 8:25 ` Wolfram Sang 2016-04-03 8:25 ` Wolfram Sang 2016-04-03 13:35 ` Sergei Shtylyov 2016-04-03 13:35 ` Sergei Shtylyov 2016-04-03 13:47 ` Wolfram Sang 2016-04-03 13:47 ` Wolfram Sang 2015-11-19 15:56 ` [PATCH v3 10/11] i2c: rcar: clean up after refactoring Wolfram Sang 2015-11-19 15:56 ` Wolfram Sang 2015-11-19 15:56 ` [PATCH v3 11/11] i2c: rcar: handle difference in setting up non-first message Wolfram Sang 2015-11-19 15:56 ` Wolfram Sang 2015-11-19 16:01 ` [PATCH v3 00/11] i2c: rcar: tackle race conditions in the driver Laurent Pinchart 2015-11-19 16:01 ` Laurent Pinchart 2015-11-30 13:27 ` Wolfram Sang 2015-11-30 13:27 ` Wolfram Sang
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