Merge tag 'gpio-fixes-for-v5.7-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux into fixes

gpio fixes for v5.7-rc6

- fix probing for chips without PWM in gpio-mvebu
- fix ida_simple_get() error path in gpio-exar
- fix user-space notifications for line state changes

Author: linusw

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-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/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;
 }
 
@@ -4961,6 +4966,9 @@ 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 +5034,9 @@ 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);