driver: Call remove function only when available

The bus implementations currently call the drivers remove
hook unconditionally, but this hook is seldomly populated. Only call
it when it's actually populated.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

arch/efi/efi/efi-device.c

@@ -328,7 +328,8 @@ static void efi_bus_remove(struct device_d *dev)
 	struct efi_driver *efidrv = to_efi_driver(dev->driver);
 	struct efi_device *efidev = to_efi_device(dev);
 
-	return efidrv->remove(efidev);
+	if (efidrv->remove)
+		efidrv->remove(efidev);
 }
 
 struct bus_type efi_bus = {

drivers/base/platform.c

@@ -29,7 +29,8 @@ static int platform_probe(struct device_d *dev)
 
 static void platform_remove(struct device_d *dev)
 {
-	dev->driver->remove(dev);
+	if (dev->driver->remove)
+		dev->driver->remove(dev);
 }
 
 int platform_driver_register(struct driver_d *drv)

drivers/i2c/i2c.c

@@ -472,7 +472,8 @@ static int i2c_probe(struct device_d *dev)
 
 static void i2c_remove(struct device_d *dev)
 {
-	dev->driver->remove(dev);
+	if (dev->driver->remove)
+		dev->driver->remove(dev);
 }
 
 struct bus_type i2c_bus = {

drivers/pci/bus.c

@@ -51,7 +51,8 @@ static void pci_remove(struct device_d *dev)
 	struct pci_dev *pdev = to_pci_dev(dev);
 	struct pci_driver *pdrv = to_pci_driver(dev->driver);
 
-	pdrv->remove(pdev);
+	if (pdrv->remove)
+		pdrv->remove(pdev);
 }
 
 struct bus_type pci_bus = {

drivers/spi/spi.c

@@ -311,7 +311,8 @@ static int spi_probe(struct device_d *dev)
 
 static void spi_remove(struct device_d *dev)
 {
-	dev->driver->remove(dev);
+	if (dev->driver->remove)
+		dev->driver->remove(dev);
 }
 
 struct bus_type spi_bus = {

drivers/w1/w1.c

@@ -392,7 +392,8 @@ static void w1_bus_remove(struct device_d *_dev)
 	struct w1_driver *drv = to_w1_driver(_dev->driver);
 	struct w1_device *dev = to_w1_device(_dev);
 
-	return drv->remove(dev);
+	if (drv->remove)
+		drv->remove(dev);
 }
 
 struct bus_type w1_bustype= {