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dm: usb: Make usb_get_bus easier to use for callers

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Make usb_get_bus easier to use for callers, by directly returning the bus
rather then returning it via a pass-by-ref argument.

This also removes the error checking from the current callers, as
we already have an assert() for bus not being NULL in usb_get_bus().

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Hans de Goede 2015-05-05 11:54:31 +02:00 • committed by Simon Glass
parent 134692af13
commit f78a5c0774
2 changed files with 7 additions and 17 deletions
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17
drivers/usb/host/usb-uclass.c
View file

@ -476,9 +476,7 @@ int usb_scan_device(struct udevice *parent, int port,
*devp = NULL;
memset(udev, '\0', sizeof(*udev));
ret = usb_get_bus(parent, &udev->controller_dev);
if (ret)
return ret;
udev->controller_dev = usb_get_bus(parent);
priv = dev_get_uclass_priv(udev->controller_dev);
/*
@ -578,35 +576,28 @@ int usb_child_post_bind(struct udevice *dev)
return 0;
}
int usb_get_bus(struct udevice *dev, struct udevice **busp)
struct udevice *usb_get_bus(struct udevice *dev)
{
struct udevice *bus;
*busp = NULL;
for (bus = dev; bus && device_get_uclass_id(bus) != UCLASS_USB; )
bus = bus->parent;
if (!bus) {
/* By design this cannot happen */
assert(bus);
debug("USB HUB '%s' does not have a controller\n", dev->name);
return -EXDEV;
}
*busp = bus;
return 0;
return bus;
}
int usb_child_pre_probe(struct udevice *dev)
{
struct udevice *bus;
struct usb_device *udev = dev_get_parentdata(dev);
struct usb_dev_platdata *plat = dev_get_parent_platdata(dev);
int ret;
ret = usb_get_bus(dev, &bus);
if (ret)
return ret;
udev->controller_dev = bus;
udev->controller_dev = usb_get_bus(dev);
udev->dev = dev;
udev->devnum = plat->devnum;
udev->slot_id = plat->slot_id;

7
include/usb.h
View file

@ -742,11 +742,10 @@ int usb_scan_device(struct udevice *parent, int port,
* will be a device with uclass UCLASS_USB.
*
* @dev: Device to check
* @busp: Returns bus, or NULL if not found
* @return 0 if OK, -EXDEV is somehow this bus does not have a controller (this
* indicates a critical error in the USB stack
* @return The bus, or NULL if not found (this indicates a critical error in
* the USB stack
*/
int usb_get_bus(struct udevice *dev, struct udevice **busp);
struct udevice *usb_get_bus(struct udevice *dev);
/**
* usb_select_config() - Set up a device ready for use