Merge tag 'gpio-v5.7-3' of git://git.kernel.org/pub/scm/linux/kernel/…

…git/linusw/linux-gpio

Pull GPIO fixes from Linus Walleij:
 "Here are some (very) late fixes for GPIO, none of them very serious
  except the one tagged for stable for enabling IRQ on open drain lines:

   - Fix probing of mvebu chips without PWM

   - Fix error path on ida_get_simple() on the exar driver

   - Notify userspace properly about line status changes when flags are
     changed on lines.

   - Fix a sleeping while holding spinlock in the mellanox driver.

   - Fix return value of the PXA and Kona probe calls.

   - Fix IRQ locking of open drain lines, it is fine to have IRQs on
     open drain lines flagged for output"

* tag 'gpio-v5.7-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio:
  gpio: fix locking open drain IRQ lines
  gpio: bcm-kona: Fix return value of bcm_kona_gpio_probe()
  gpio: pxa: Fix return value of pxa_gpio_probe()
  gpio: mlxbf2: Fix sleeping while holding spinlock
  gpiolib: notify user-space about line status changes after flags are set
  gpio: exar: Fix bad handling for ida_simple_get error path
  gpio: mvebu: Fix probing for chips without PWM

drivers/gpio/gpio-bcm-kona.c

@@ -625,7 +625,7 @@ static int bcm_kona_gpio_probe(struct platform_device *pdev)
 
 	kona_gpio->reg_base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(kona_gpio->reg_base)) {
-		ret = -ENXIO;
+		ret = PTR_ERR(kona_gpio->reg_base);
 		goto err_irq_domain;
 	}
 

drivers/gpio/gpio-exar.c

@@ -148,8 +148,10 @@ static int gpio_exar_probe(struct platform_device *pdev)
 	mutex_init(&exar_gpio->lock);
 
 	index = ida_simple_get(&ida_index, 0, 0, GFP_KERNEL);
-	if (index < 0)
-		goto err_destroy;
+	if (index < 0) {
+		ret = index;
+		goto err_mutex_destroy;
+	}
 
 	sprintf(exar_gpio->name, "exar_gpio%d", index);
 	exar_gpio->gpio_chip.label = exar_gpio->name;
@@ -176,6 +178,7 @@ static int gpio_exar_probe(struct platform_device *pdev)
 
 err_destroy:
 	ida_simple_remove(&ida_index, index);
+err_mutex_destroy:
 	mutex_destroy(&exar_gpio->lock);
 	return ret;
 }

drivers/gpio/gpio-mlxbf2.c

@@ -127,17 +127,17 @@ static int mlxbf2_gpio_lock_acquire(struct mlxbf2_gpio_context *gs)
 {
 	u32 arm_gpio_lock_val;
 
-	spin_lock(&gs->gc.bgpio_lock);
 	mutex_lock(yu_arm_gpio_lock_param.lock);
+	spin_lock(&gs->gc.bgpio_lock);
 
 	arm_gpio_lock_val = readl(yu_arm_gpio_lock_param.io);
 
 	/*
 	 * When lock active bit[31] is set, ModeX is write enabled
 	 */
 	if (YU_LOCK_ACTIVE_BIT(arm_gpio_lock_val)) {
-		mutex_unlock(yu_arm_gpio_lock_param.lock);
 		spin_unlock(&gs->gc.bgpio_lock);
+		mutex_unlock(yu_arm_gpio_lock_param.lock);
 		return -EINVAL;
 	}
 
@@ -152,8 +152,8 @@ static int mlxbf2_gpio_lock_acquire(struct mlxbf2_gpio_context *gs)
 static void mlxbf2_gpio_lock_release(struct mlxbf2_gpio_context *gs)
 {
 	writel(YU_ARM_GPIO_LOCK_RELEASE, yu_arm_gpio_lock_param.io);
-	mutex_unlock(yu_arm_gpio_lock_param.lock);
 	spin_unlock(&gs->gc.bgpio_lock);
+	mutex_unlock(yu_arm_gpio_lock_param.lock);
 }
 
 /*

drivers/gpio/gpio-mvebu.c

@@ -782,6 +782,15 @@ static int mvebu_pwm_probe(struct platform_device *pdev,
 				     "marvell,armada-370-gpio"))
 		return 0;
 
+	/*
+	 * There are only two sets of PWM configuration registers for
+	 * all the GPIO lines on those SoCs which this driver reserves
+	 * for the first two GPIO chips. So if the resource is missing
+	 * we can't treat it as an error.
+	 */
+	if (!platform_get_resource_byname(pdev, IORESOURCE_MEM, "pwm"))
+		return 0;
+
 	if (IS_ERR(mvchip->clk))
 		return PTR_ERR(mvchip->clk);
 
@@ -804,12 +813,6 @@ static int mvebu_pwm_probe(struct platform_device *pdev,
 	mvchip->mvpwm = mvpwm;
 	mvpwm->mvchip = mvchip;
 
-	/*
-	 * There are only two sets of PWM configuration registers for
-	 * all the GPIO lines on those SoCs which this driver reserves
-	 * for the first two GPIO chips. So if the resource is missing
-	 * we can't treat it as an error.
-	 */
 	mvpwm->membase = devm_platform_ioremap_resource_byname(pdev, "pwm");
 	if (IS_ERR(mvpwm->membase))
 		return PTR_ERR(mvpwm->membase);

drivers/gpio/gpio-pxa.c

@@ -660,8 +660,8 @@ static int pxa_gpio_probe(struct platform_device *pdev)
 	pchip->irq1 = irq1;
 
 	gpio_reg_base = devm_platform_ioremap_resource(pdev, 0);
-	if (!gpio_reg_base)
-		return -EINVAL;
+	if (IS_ERR(gpio_reg_base))
+		return PTR_ERR(gpio_reg_base);
 
 	clk = clk_get(&pdev->dev, NULL);
 	if (IS_ERR(clk)) {

drivers/gpio/gpiolib.c

@@ -729,6 +729,10 @@ static int linehandle_create(struct gpio_device *gdev, void __user *ip)
 			if (ret)
 				goto out_free_descs;
 		}
+
+		atomic_notifier_call_chain(&desc->gdev->notifier,
+					   GPIOLINE_CHANGED_REQUESTED, desc);
+
 		dev_dbg(&gdev->dev, "registered chardev handle for line %d\n",
 			offset);
 	}
@@ -1083,6 +1087,9 @@ static int lineevent_create(struct gpio_device *gdev, void __user *ip)
 	if (ret)
 		goto out_free_desc;
 
+	atomic_notifier_call_chain(&desc->gdev->notifier,
+				   GPIOLINE_CHANGED_REQUESTED, desc);
+
 	le->irq = gpiod_to_irq(desc);
 	if (le->irq <= 0) {
 		ret = -ENODEV;
@@ -2998,8 +3005,6 @@ static int gpiod_request_commit(struct gpio_desc *desc, const char *label)
 	}
 done:
 	spin_unlock_irqrestore(&gpio_lock, flags);
-	atomic_notifier_call_chain(&desc->gdev->notifier,
-				   GPIOLINE_CHANGED_REQUESTED, desc);
 	return ret;
 }
 
@@ -4215,7 +4220,9 @@ int gpiochip_lock_as_irq(struct gpio_chip *gc, unsigned int offset)
 		}
 	}
 
-	if (test_bit(FLAG_IS_OUT, &desc->flags)) {
+	/* To be valid for IRQ the line needs to be input or open drain */
+	if (test_bit(FLAG_IS_OUT, &desc->flags) &&
+	    !test_bit(FLAG_OPEN_DRAIN, &desc->flags)) {
 		chip_err(gc,
 			 "%s: tried to flag a GPIO set as output for IRQ\n",
 			 __func__);
@@ -4278,7 +4285,12 @@ void gpiochip_enable_irq(struct gpio_chip *gc, unsigned int offset)
 
 	if (!IS_ERR(desc) &&
 	    !WARN_ON(!test_bit(FLAG_USED_AS_IRQ, &desc->flags))) {
-		WARN_ON(test_bit(FLAG_IS_OUT, &desc->flags));
+		/*
+		 * We must not be output when using IRQ UNLESS we are
+		 * open drain.
+		 */
+		WARN_ON(test_bit(FLAG_IS_OUT, &desc->flags) &&
+			!test_bit(FLAG_OPEN_DRAIN, &desc->flags));
 		set_bit(FLAG_IRQ_IS_ENABLED, &desc->flags);
 	}
 }
@@ -4961,6 +4973,9 @@ struct gpio_desc *__must_check gpiod_get_index(struct device *dev,
 		return ERR_PTR(ret);
 	}
 
+	atomic_notifier_call_chain(&desc->gdev->notifier,
+				   GPIOLINE_CHANGED_REQUESTED, desc);
+
 	return desc;
 }
 EXPORT_SYMBOL_GPL(gpiod_get_index);
@@ -5026,6 +5041,9 @@ struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode,
 		return ERR_PTR(ret);
 	}
 
+	atomic_notifier_call_chain(&desc->gdev->notifier,
+				   GPIOLINE_CHANGED_REQUESTED, desc);
+
 	return desc;
 }
 EXPORT_SYMBOL_GPL(fwnode_get_named_gpiod);