diff mbox

[v6,3/4] power: supply: twl4030-charger: move irq allocation to just before irqs are enabled

Message ID 0eeffa7a6ab8e4213f518e2caf6982d2b77dc0b2.1497432355.git.hns@goldelico.com (mailing list archive)
State Not Applicable, archived
Headers show

Commit Message

H. Nikolaus Schaller June 14, 2017, 9:25 a.m. UTC
This avoids a potential race if irqs are enabled and triggered too early
before the worker is properly set up.

Suggested-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
---
 drivers/power/supply/twl4030_charger.c | 28 ++++++++++++++--------------
 1 file changed, 14 insertions(+), 14 deletions(-)

Comments

Sebastian Reichel June 15, 2017, 11:47 a.m. UTC | #1
Hi,

On Wed, Jun 14, 2017 at 11:25:55AM +0200, H. Nikolaus Schaller wrote:
> This avoids a potential race if irqs are enabled and triggered too early
> before the worker is properly set up.
> 
> Suggested-by: Grygorii Strashko <grygorii.strashko@ti.com>
> Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
> ---
>  drivers/power/supply/twl4030_charger.c | 28 ++++++++++++++--------------
>  1 file changed, 14 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/power/supply/twl4030_charger.c b/drivers/power/supply/twl4030_charger.c
> index 1fbbe0cc216a..3bebeecb4a1f 100644
> --- a/drivers/power/supply/twl4030_charger.c
> +++ b/drivers/power/supply/twl4030_charger.c
> @@ -984,6 +984,16 @@ static int twl4030_bci_probe(struct platform_device *pdev)
>  
>  	platform_set_drvdata(pdev, bci);
>  
> +	if (bci->dev->of_node) {
> +		struct device_node *phynode;
> +
> +		phynode = of_find_compatible_node(bci->dev->of_node->parent,
> +						  NULL, "ti,twl4030-usb");
> +		if (phynode)
> +			bci->transceiver = devm_usb_get_phy_by_node(
> +				bci->dev, phynode, &bci->usb_nb);
> +	}
> +

The notifier is not that much different from an irq. I see
the call can access at least the iio channel (so iio channel
should be registered first). I suspect worker and power-supply
should also be initialized/registered first. Best location seems
to be directly before requesting the irqs.

>  	bci->channel_vac = devm_iio_channel_get(&pdev->dev, "vac");
>  	if (IS_ERR(bci->channel_vac)) {
>  		bci->channel_vac = NULL;
> @@ -1006,6 +1016,10 @@ static int twl4030_bci_probe(struct platform_device *pdev)
>  		return ret;
>  	}
>  
> +	INIT_WORK(&bci->work, twl4030_bci_usb_work);
> +	INIT_DELAYED_WORK(&bci->current_worker, twl4030_current_worker);
> +
> +	bci->usb_nb.notifier_call = twl4030_bci_usb_ncb;

You should configure the notifier block *before* registering it.

>  	ret = devm_request_threaded_irq(&pdev->dev, bci->irq_chg, NULL,
>  			twl4030_charger_interrupt, IRQF_ONESHOT, pdev->name,
>  			bci);
> @@ -1023,20 +1037,6 @@ static int twl4030_bci_probe(struct platform_device *pdev)
>  		return ret;
>  	}
>  
> -	INIT_WORK(&bci->work, twl4030_bci_usb_work);
> -	INIT_DELAYED_WORK(&bci->current_worker, twl4030_current_worker);
> -
> -	bci->usb_nb.notifier_call = twl4030_bci_usb_ncb;
> -	if (bci->dev->of_node) {
> -		struct device_node *phynode;
> -
> -		phynode = of_find_compatible_node(bci->dev->of_node->parent,
> -						  NULL, "ti,twl4030-usb");
> -		if (phynode)
> -			bci->transceiver = devm_usb_get_phy_by_node(
> -				bci->dev, phynode, &bci->usb_nb);
> -	}
> -
>  	/* Enable interrupts now. */
>  	reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC | TWL4030_TBATOR2 |
>  		TWL4030_TBATOR1 | TWL4030_BATSTS);

-- Sebastian
diff mbox

Patch

diff --git a/drivers/power/supply/twl4030_charger.c b/drivers/power/supply/twl4030_charger.c
index 1fbbe0cc216a..3bebeecb4a1f 100644
--- a/drivers/power/supply/twl4030_charger.c
+++ b/drivers/power/supply/twl4030_charger.c
@@ -984,6 +984,16 @@  static int twl4030_bci_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, bci);
 
+	if (bci->dev->of_node) {
+		struct device_node *phynode;
+
+		phynode = of_find_compatible_node(bci->dev->of_node->parent,
+						  NULL, "ti,twl4030-usb");
+		if (phynode)
+			bci->transceiver = devm_usb_get_phy_by_node(
+				bci->dev, phynode, &bci->usb_nb);
+	}
+
 	bci->channel_vac = devm_iio_channel_get(&pdev->dev, "vac");
 	if (IS_ERR(bci->channel_vac)) {
 		bci->channel_vac = NULL;
@@ -1006,6 +1016,10 @@  static int twl4030_bci_probe(struct platform_device *pdev)
 		return ret;
 	}
 
+	INIT_WORK(&bci->work, twl4030_bci_usb_work);
+	INIT_DELAYED_WORK(&bci->current_worker, twl4030_current_worker);
+
+	bci->usb_nb.notifier_call = twl4030_bci_usb_ncb;
 	ret = devm_request_threaded_irq(&pdev->dev, bci->irq_chg, NULL,
 			twl4030_charger_interrupt, IRQF_ONESHOT, pdev->name,
 			bci);
@@ -1023,20 +1037,6 @@  static int twl4030_bci_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	INIT_WORK(&bci->work, twl4030_bci_usb_work);
-	INIT_DELAYED_WORK(&bci->current_worker, twl4030_current_worker);
-
-	bci->usb_nb.notifier_call = twl4030_bci_usb_ncb;
-	if (bci->dev->of_node) {
-		struct device_node *phynode;
-
-		phynode = of_find_compatible_node(bci->dev->of_node->parent,
-						  NULL, "ti,twl4030-usb");
-		if (phynode)
-			bci->transceiver = devm_usb_get_phy_by_node(
-				bci->dev, phynode, &bci->usb_nb);
-	}
-
 	/* Enable interrupts now. */
 	reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC | TWL4030_TBATOR2 |
 		TWL4030_TBATOR1 | TWL4030_BATSTS);