[PATCH 1/5] rtc: at91sam9: properly handle error case

[PATCH 1/5] rtc: at91sam9: properly handle error case

[Alexandre Belloni]

In case of a probe error, it is possible to abort after issuing
clk_prepare_enable(). Ensure the clock is disabled and unprepared in that
case.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
---
 drivers/rtc/rtc-at91sam9.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/rtc/rtc-at91sam9.c b/drivers/rtc/rtc-at91sam9.c
index 5ccaee32df72..152cd816cc43 100644
--- a/drivers/rtc/rtc-at91sam9.c
+++ b/drivers/rtc/rtc-at91sam9.c
@@ -451,8 +451,10 @@ static int at91_rtc_probe(struct platform_device *pdev)
 
 	rtc->rtcdev = devm_rtc_device_register(&pdev->dev, pdev->name,
 					&at91_rtc_ops, THIS_MODULE);
-	if (IS_ERR(rtc->rtcdev))
-		return PTR_ERR(rtc->rtcdev);
+	if (IS_ERR(rtc->rtcdev)) {
+		ret = PTR_ERR(rtc->rtcdev);
+		goto err_clk;
+	}
 
 	/* register irq handler after we know what name we'll use */
 	ret = devm_request_irq(&pdev->dev, rtc->irq, at91_rtc_interrupt,
@@ -460,7 +462,7 @@ static int at91_rtc_probe(struct platform_device *pdev)
 			       dev_name(&rtc->rtcdev->dev), rtc);
 	if (ret) {
 		dev_dbg(&pdev->dev, "can't share IRQ %d?\n", rtc->irq);
-		return ret;
+		goto err_clk;
 	}
 
 	/* NOTE:  sam9260 rev A silicon has a ROM bug which resets the
@@ -474,6 +476,11 @@ static int at91_rtc_probe(struct platform_device *pdev)
 				dev_name(&rtc->rtcdev->dev));
 
 	return 0;
+
+err_clk:
+	clk_disable_unprepare(rtc->sclk);
+
+	return ret;
 }
 
 /*
-- 
2.1.4

[PATCH 2/5] rtc: at91sam9: remove useless check

[Alexandre Belloni]

rtc->sclk necessarily points to a valid clocks at this point. Else the
probe would have aborted.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
---
 drivers/rtc/rtc-at91sam9.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/rtc/rtc-at91sam9.c b/drivers/rtc/rtc-at91sam9.c
index 152cd816cc43..0a8485ac3864 100644
--- a/drivers/rtc/rtc-at91sam9.c
+++ b/drivers/rtc/rtc-at91sam9.c
@@ -494,8 +494,7 @@ static int at91_rtc_remove(struct platform_device *pdev)
 	/* disable all interrupts */
 	rtt_writel(rtc, MR, mr & ~(AT91_RTT_ALMIEN | AT91_RTT_RTTINCIEN));
 
-	if (!IS_ERR(rtc->sclk))
-		clk_disable_unprepare(rtc->sclk);
+	clk_disable_unprepare(rtc->sclk);
 
 	return 0;
 }
-- 
2.1.4

[PATCH 3/5] rtc: at91sam9: sort headers alphabetically

[Alexandre Belloni]

Sort included headers alphabetically.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
---
 drivers/rtc/rtc-at91sam9.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/rtc/rtc-at91sam9.c b/drivers/rtc/rtc-at91sam9.c
index 0a8485ac3864..23f721d049b2 100644
--- a/drivers/rtc/rtc-at91sam9.c
+++ b/drivers/rtc/rtc-at91sam9.c
@@ -11,20 +11,20 @@
  * 2 of the License, or (at your option) any later version.
  */
 
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/platform_device.h>
-#include <linux/time.h>
-#include <linux/rtc.h>
+#include <linux/clk.h>
 #include <linux/interrupt.h>
 #include <linux/ioctl.h>
-#include <linux/slab.h>
-#include <linux/platform_data/atmel.h>
 #include <linux/io.h>
+#include <linux/kernel.h>
 #include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/platform_data/atmel.h>
+#include <linux/platform_device.h>
 #include <linux/regmap.h>
+#include <linux/rtc.h>
+#include <linux/slab.h>
 #include <linux/suspend.h>
-#include <linux/clk.h>
+#include <linux/time.h>
 
 /*
  * This driver uses two configurable hardware resources that live in the
-- 
2.1.4

[PATCH 4/5] rtc: at91sam9: get sclk rate after enabling it

[Alexandre Belloni]

See help for clk_get_rate(): "obtain the current clock rate (in Hz) for a
clock source. This is only valid once the clock source has been enabled."

It currently returns the correct value but that may not stay that way.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
---
 drivers/rtc/rtc-at91sam9.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/rtc/rtc-at91sam9.c b/drivers/rtc/rtc-at91sam9.c
index 23f721d049b2..f9e85ace5e71 100644
--- a/drivers/rtc/rtc-at91sam9.c
+++ b/drivers/rtc/rtc-at91sam9.c
@@ -425,18 +425,19 @@ static int at91_rtc_probe(struct platform_device *pdev)
 	if (IS_ERR(rtc->sclk))
 		return PTR_ERR(rtc->sclk);
 
-	sclk_rate = clk_get_rate(rtc->sclk);
-	if (!sclk_rate || sclk_rate > AT91_RTT_RTPRES) {
-		dev_err(&pdev->dev, "Invalid slow clock rate\n");
-		return -EINVAL;
-	}
-
 	ret = clk_prepare_enable(rtc->sclk);
 	if (ret) {
 		dev_err(&pdev->dev, "Could not enable slow clock\n");
 		return ret;
 	}
 
+	sclk_rate = clk_get_rate(rtc->sclk);
+	if (!sclk_rate || sclk_rate > AT91_RTT_RTPRES) {
+		dev_err(&pdev->dev, "Invalid slow clock rate\n");
+		ret = -EINVAL;
+		goto err_clk;
+	}
+
 	mr = rtt_readl(rtc, MR);
 
 	/* unless RTT is counting at 1 Hz, re-initialize it */
-- 
2.1.4

[PATCH 5/5] rtc: at91rm9200: sort headers alphabetically

[Alexandre Belloni]

Sort included headers alphabetically.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
---
 drivers/rtc/rtc-at91rm9200.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/rtc/rtc-at91rm9200.c b/drivers/rtc/rtc-at91rm9200.c
index 8093d9e50619..cb62e214b52a 100644
--- a/drivers/rtc/rtc-at91rm9200.c
+++ b/drivers/rtc/rtc-at91rm9200.c
@@ -18,21 +18,21 @@
  *
  */
 
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/platform_device.h>
-#include <linux/time.h>
-#include <linux/rtc.h>
 #include <linux/bcd.h>
 #include <linux/clk.h>
+#include <linux/completion.h>
 #include <linux/interrupt.h>
-#include <linux/spinlock.h>
 #include <linux/ioctl.h>
-#include <linux/completion.h>
 #include <linux/io.h>
-#include <linux/of.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
 #include <linux/of_device.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/rtc.h>
+#include <linux/spinlock.h>
 #include <linux/suspend.h>
+#include <linux/time.h>
 #include <linux/uaccess.h>
 
 #include "rtc-at91rm9200.h"
-- 
2.1.4

[PATCH 1/5] rtc: at91sam9: properly handle error case

[Boris Brezillon]

On Thu, 30 Jul 2015 02:24:28 +0200
Alexandre Belloni <alexandre.belloni@free-electrons.com> wrote:

> In case of a probe error, it is possible to abort after issuing
> clk_prepare_enable(). Ensure the clock is disabled and unprepared in that
> case.
> 
> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

To the whole series:

Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>

> ---
>  drivers/rtc/rtc-at91sam9.c | 13 ++++++++++---
>  1 file changed, 10 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/rtc/rtc-at91sam9.c b/drivers/rtc/rtc-at91sam9.c
> index 5ccaee32df72..152cd816cc43 100644
> --- a/drivers/rtc/rtc-at91sam9.c
> +++ b/drivers/rtc/rtc-at91sam9.c
> @@ -451,8 +451,10 @@ static int at91_rtc_probe(struct platform_device *pdev)
>  
>  	rtc->rtcdev = devm_rtc_device_register(&pdev->dev, pdev->name,
>  					&at91_rtc_ops, THIS_MODULE);
> -	if (IS_ERR(rtc->rtcdev))
> -		return PTR_ERR(rtc->rtcdev);
> +	if (IS_ERR(rtc->rtcdev)) {
> +		ret = PTR_ERR(rtc->rtcdev);
> +		goto err_clk;
> +	}
>  
>  	/* register irq handler after we know what name we'll use */
>  	ret = devm_request_irq(&pdev->dev, rtc->irq, at91_rtc_interrupt,
> @@ -460,7 +462,7 @@ static int at91_rtc_probe(struct platform_device *pdev)
>  			       dev_name(&rtc->rtcdev->dev), rtc);
>  	if (ret) {
>  		dev_dbg(&pdev->dev, "can't share IRQ %d?\n", rtc->irq);
> -		return ret;
> +		goto err_clk;
>  	}
>  
>  	/* NOTE:  sam9260 rev A silicon has a ROM bug which resets the
> @@ -474,6 +476,11 @@ static int at91_rtc_probe(struct platform_device *pdev)
>  				dev_name(&rtc->rtcdev->dev));
>  
>  	return 0;
> +
> +err_clk:
> +	clk_disable_unprepare(rtc->sclk);
> +
> +	return ret;
>  }
>  
>  /*



-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

[PATCH 1/5] rtc: at91sam9: properly handle error case

[Nicolas Ferre]

Le 30/07/2015 02:24, Alexandre Belloni a ?crit :
> In case of a probe error, it is possible to abort after issuing
> clk_prepare_enable(). Ensure the clock is disabled and unprepared in that
> case.
> 
> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

To the whole series:
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>

Thanks.

> ---
>  drivers/rtc/rtc-at91sam9.c | 13 ++++++++++---
>  1 file changed, 10 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/rtc/rtc-at91sam9.c b/drivers/rtc/rtc-at91sam9.c
> index 5ccaee32df72..152cd816cc43 100644
> --- a/drivers/rtc/rtc-at91sam9.c
> +++ b/drivers/rtc/rtc-at91sam9.c
> @@ -451,8 +451,10 @@ static int at91_rtc_probe(struct platform_device *pdev)
>  
>  	rtc->rtcdev = devm_rtc_device_register(&pdev->dev, pdev->name,
>  					&at91_rtc_ops, THIS_MODULE);
> -	if (IS_ERR(rtc->rtcdev))
> -		return PTR_ERR(rtc->rtcdev);
> +	if (IS_ERR(rtc->rtcdev)) {
> +		ret = PTR_ERR(rtc->rtcdev);
> +		goto err_clk;
> +	}
>  
>  	/* register irq handler after we know what name we'll use */
>  	ret = devm_request_irq(&pdev->dev, rtc->irq, at91_rtc_interrupt,
> @@ -460,7 +462,7 @@ static int at91_rtc_probe(struct platform_device *pdev)
>  			       dev_name(&rtc->rtcdev->dev), rtc);
>  	if (ret) {
>  		dev_dbg(&pdev->dev, "can't share IRQ %d?\n", rtc->irq);
> -		return ret;
> +		goto err_clk;
>  	}
>  
>  	/* NOTE:  sam9260 rev A silicon has a ROM bug which resets the
> @@ -474,6 +476,11 @@ static int at91_rtc_probe(struct platform_device *pdev)
>  				dev_name(&rtc->rtcdev->dev));
>  
>  	return 0;
> +
> +err_clk:
> +	clk_disable_unprepare(rtc->sclk);
> +
> +	return ret;
>  }
>  
>  /*
> 


-- 
Nicolas Ferre