[PATCH v6 19/20] dm: treewide: Do not use the return value of simple uclass iterator

[Michal Suchanek <msuchanek@suse.de>]

uclass_first_device/uclass_next_device return value will be removed,
don't use it.

With the current implementation dev is equivalent to !ret. It is
redundant to check both, ret check can be replaced with dev check, and
ret check inside the iteration is dead code.

Signed-off-by: Michal Suchanek <msuchanek@suse.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
---
v5: - consolidate multiple similar patches
---
 cmd/virtio.c               |  9 +++------
 drivers/dma/dma-uclass.c   |  7 +++----
 drivers/gpio/gpio-uclass.c | 14 ++++++--------
 drivers/pci/pci-uclass.c   | 15 +++------------
 drivers/w1/w1-uclass.c     |  9 ++-------
 5 files changed, 17 insertions(+), 37 deletions(-)

diff --git a/cmd/virtio.c b/cmd/virtio.c
index ec87d4f02c..019e317e75 100644
--- a/cmd/virtio.c
+++ b/cmd/virtio.c
@@ -23,18 +23,15 @@ static int do_virtio(struct cmd_tbl *cmdtp, int flag, int argc,
 		 * device_probe() for children (i.e. virtio devices)
 		 */
 		struct udevice *bus, *child;
-		int ret;
 
-		ret = uclass_first_device(UCLASS_VIRTIO, &bus);
-		if (ret)
+		uclass_first_device(UCLASS_VIRTIO, &bus);
+		if (!bus)
 			return CMD_RET_FAILURE;
 
 		while (bus) {
 			device_foreach_child_probe(child, bus)
 				;
-			ret = uclass_next_device(&bus);
-			if (ret)
-				break;
+			uclass_next_device(&bus);
 		}
 
 		return CMD_RET_SUCCESS;
diff --git a/drivers/dma/dma-uclass.c b/drivers/dma/dma-uclass.c
index 012609bb53..952cbc2170 100644
--- a/drivers/dma/dma-uclass.c
+++ b/drivers/dma/dma-uclass.c
@@ -209,10 +209,9 @@ int dma_get_cfg(struct dma *dma, u32 cfg_id, void **cfg_data)
 int dma_get_device(u32 transfer_type, struct udevice **devp)
 {
 	struct udevice *dev;
-	int ret;
 
-	for (ret = uclass_first_device(UCLASS_DMA, &dev); dev && !ret;
-	     ret = uclass_next_device(&dev)) {
+	for (uclass_first_device(UCLASS_DMA, &dev); dev;
+	     uclass_next_device(&dev)) {
 		struct dma_dev_priv *uc_priv;
 
 		uc_priv = dev_get_uclass_priv(dev);
@@ -228,7 +227,7 @@ int dma_get_device(u32 transfer_type, struct udevice **devp)
 
 	*devp = dev;
 
-	return ret;
+	return 0;
 }
 
 int dma_memcpy(void *dst, void *src, size_t len)
diff --git a/drivers/gpio/gpio-uclass.c b/drivers/gpio/gpio-uclass.c
index a00880e446..3429ccaaca 100644
--- a/drivers/gpio/gpio-uclass.c
+++ b/drivers/gpio/gpio-uclass.c
@@ -59,11 +59,10 @@ static int gpio_to_device(unsigned int gpio, struct gpio_desc *desc)
 {
 	struct gpio_dev_priv *uc_priv;
 	struct udevice *dev;
-	int ret;
 
-	for (ret = uclass_first_device(UCLASS_GPIO, &dev);
+	for (uclass_first_device(UCLASS_GPIO, &dev);
 	     dev;
-	     ret = uclass_next_device(&dev)) {
+	     uclass_next_device(&dev)) {
 		uc_priv = dev_get_uclass_priv(dev);
 		if (gpio >= uc_priv->gpio_base &&
 		    gpio < uc_priv->gpio_base + uc_priv->gpio_count) {
@@ -73,7 +72,7 @@ static int gpio_to_device(unsigned int gpio, struct gpio_desc *desc)
 	}
 
 	/* No such GPIO */
-	return ret ? ret : -ENOENT;
+	return -ENOENT;
 }
 
 #if CONFIG_IS_ENABLED(DM_GPIO_LOOKUP_LABEL)
@@ -121,12 +120,11 @@ int dm_gpio_lookup_name(const char *name, struct gpio_desc *desc)
 	struct udevice *dev;
 	ulong offset;
 	int numeric;
-	int ret;
 
 	numeric = isdigit(*name) ? dectoul(name, NULL) : -1;
-	for (ret = uclass_first_device(UCLASS_GPIO, &dev);
+	for (uclass_first_device(UCLASS_GPIO, &dev);
 	     dev;
-	     ret = uclass_next_device(&dev)) {
+	     uclass_next_device(&dev)) {
 		int len;
 
 		uc_priv = dev_get_uclass_priv(dev);
@@ -154,7 +152,7 @@ int dm_gpio_lookup_name(const char *name, struct gpio_desc *desc)
 	}
 
 	if (!dev)
-		return ret ? ret : -EINVAL;
+		return -EINVAL;
 
 	gpio_desc_init(desc, dev, offset);
 
diff --git a/drivers/pci/pci-uclass.c b/drivers/pci/pci-uclass.c
index 6dd19650f9..9343cfc62a 100644
--- a/drivers/pci/pci-uclass.c
+++ b/drivers/pci/pci-uclass.c
@@ -1211,7 +1211,6 @@ static int pci_bridge_write_config(struct udevice *bus, pci_dev_t bdf,
 static int skip_to_next_device(struct udevice *bus, struct udevice **devp)
 {
 	struct udevice *dev;
-	int ret = 0;
 
 	/*
 	 * Scan through all the PCI controllers. On x86 there will only be one
@@ -1223,9 +1222,7 @@ static int skip_to_next_device(struct udevice *bus, struct udevice **devp)
 			*devp = dev;
 			return 0;
 		}
-		ret = uclass_next_device(&bus);
-		if (ret)
-			return ret;
+		uclass_next_device(&bus);
 	}
 
 	return 0;
@@ -1235,7 +1232,6 @@ int pci_find_next_device(struct udevice **devp)
 {
 	struct udevice *child = *devp;
 	struct udevice *bus = child->parent;
-	int ret;
 
 	/* First try all the siblings */
 	*devp = NULL;
@@ -1248,9 +1244,7 @@ int pci_find_next_device(struct udevice **devp)
 	}
 
 	/* We ran out of siblings. Try the next bus */
-	ret = uclass_next_device(&bus);
-	if (ret)
-		return ret;
+	uclass_next_device(&bus);
 
 	return bus ? skip_to_next_device(bus, devp) : 0;
 }
@@ -1258,12 +1252,9 @@ int pci_find_next_device(struct udevice **devp)
 int pci_find_first_device(struct udevice **devp)
 {
 	struct udevice *bus;
-	int ret;
 
 	*devp = NULL;
-	ret = uclass_first_device(UCLASS_PCI, &bus);
-	if (ret)
-		return ret;
+	uclass_first_device(UCLASS_PCI, &bus);
 
 	return skip_to_next_device(bus, devp);
 }
diff --git a/drivers/w1/w1-uclass.c b/drivers/w1/w1-uclass.c
index de4f25bcf9..a4247ecd62 100644
--- a/drivers/w1/w1-uclass.c
+++ b/drivers/w1/w1-uclass.c
@@ -36,15 +36,10 @@ int w1_bus_find_dev(const struct udevice *bus, u64 id, struct udevice
 {
 	struct udevice *dev;
 	u8 family = id & 0xff;
-	int ret;
 
-	for (ret = uclass_first_device(UCLASS_W1_EEPROM, &dev);
-		!ret && dev;
+	for (uclass_first_device(UCLASS_W1_EEPROM, &dev);
+		dev;
 		uclass_next_device(&dev)) {
-		if (ret || !dev) {
-			debug("cannot find w1 eeprom dev\n");
-			return -ENODEV;
-		}
 
 		if (dev_get_driver_data(dev) == family) {
 			*devp = dev;
-- 
2.37.3