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dm: core: Add safe device iteration macros

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Add iteration macros which support unbinding a device within the loop.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2015-11-08 23:47:52 -07:00
parent 45bfa47e12
commit 7aeac5bc8c
2 changed files with 27 additions and 0 deletions
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12
include/dm/device.h
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@ -509,6 +509,18 @@ static inline bool device_is_on_pci_bus(struct udevice *dev)
return device_get_uclass_id(dev->parent) == UCLASS_PCI;
}
/**
* device_foreach_child_safe() - iterate through child devices safely
*
* This allows the @pos child to be removed in the loop if required.
*
* @pos: struct udevice * for the current device
* @next: struct udevice * for the next device
* @parent: parent device to scan
*/
#define device_foreach_child_safe(pos, next, parent) \
list_for_each_entry_safe(pos, next, &parent->child_head, sibling_node)
/* device resource management */
typedef void (*dr_release_t)(struct udevice *dev, void *res);
typedef int (*dr_match_t)(struct udevice *dev, void *res, void *match_data);

15
include/dm/uclass.h
View File

@ -243,4 +243,19 @@ int uclass_resolve_seq(struct udevice *dev);
#define uclass_foreach_dev(pos, uc) \
list_for_each_entry(pos, &uc->dev_head, uclass_node)
/**
* uclass_foreach_dev_safe() - Helper function to safely iteration through devs
*
* This creates a for() loop which works through the available devices in
* a uclass in order from start to end. Inside the loop, it is safe to remove
* @pos if required.
*
* @pos: struct udevice * to hold the current device. Set to NULL when there
* are no more devices.
* @next: struct udevice * to hold the next next
* @uc: uclass to scan
*/
#define uclass_foreach_dev_safe(pos, next, uc) \
list_for_each_entry_safe(pos, next, &uc->dev_head, uclass_node)
#endif