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greybus: endo: clean up id assignment code

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Recently code was added (back) to assign a unique id to each
endo, so satisfy uniqueness requirements of the Linux device
subsystem.  An ID allocator is used to manage the space of IDs.

Now that we have gb_endo_init(), we can initialize the map there,
and fully hide the ID map within "endo.c".

The original functions gb_endo_id_alloc() and gb_endo_id_free()
provided a nice abstract interface, but the direct ID allocation
calls are quite simple, so just call them directly.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Alex Elder 2015-06-09 17:42:52 -05:00 committed by Greg Kroah-Hartman
parent f35ab903ef
commit 79dda60987
3 changed files with 7 additions and 38 deletions
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2
drivers/staging/greybus/core.c
View file

@ -256,8 +256,6 @@ static int __init gb_init(void)
goto error_bus;
}
ida_init(&greybus_endo_id_map);
retval = gb_ap_init();
if (retval) {
pr_err("gb_ap_init failed (%d)\n", retval);

41
drivers/staging/greybus/endo.c
View file

@ -43,7 +43,7 @@
#define max_endo_interface_id(endo_layout) \
(4 + ((endo_layout)->max_ribs + 1) * 2)
struct ida greybus_endo_id_map;
static struct ida greybus_endo_id_map;
/* endo sysfs attributes */
static ssize_t serial_number_show(struct device *dev,
@ -434,42 +434,13 @@ static int create_modules(struct gb_endo *endo)
return 0;
}
/*
* Allocate an available Id to uniquely identify the endo device. The lowest
* available id is returned, so the first call is guaranteed to allocate endo Id
* 0.
*
* Assigns the endo's id and returns 0 if successful.
* Returns error otherwise.
*/
static int gb_endo_id_alloc(struct gb_endo *endo)
{
int id;
id = ida_simple_get(&greybus_endo_id_map, 0, 0, GFP_ATOMIC);
if (id < 0)
return id;
endo->dev_id = (u16)id;
return 0;
}
/*
* Free a previously-allocated Endo Id.
*/
static void gb_endo_id_free(struct gb_endo *endo)
{
ida_simple_remove(&greybus_endo_id_map, endo->dev_id);
}
static int gb_endo_register(struct greybus_host_device *hd,
struct gb_endo *endo)
{
int retval;
retval = gb_endo_id_alloc(endo);
if (retval)
retval = ida_simple_get(&greybus_endo_id_map, 0, 0, GFP_ATOMIC);
if (retval < 0)
return retval;
endo->dev.parent = hd->parent;
@ -491,7 +462,7 @@ static int gb_endo_register(struct greybus_host_device *hd,
dev_err(hd->parent, "failed to add endo device of id 0x%04x\n",
endo->id);
put_device(&endo->dev);
gb_endo_id_free(endo);
ida_simple_remove(&greybus_endo_id_map, endo->dev_id);
}
return retval;
@ -547,12 +518,14 @@ void gb_endo_remove(struct gb_endo *endo)
/* remove all modules for this endo */
gb_module_remove_all(endo);
gb_endo_id_free(endo);
ida_simple_remove(&greybus_endo_id_map, endo->dev_id);
device_unregister(&endo->dev);
}
int __init gb_endo_init(void)
{
ida_init(&greybus_endo_id_map);
return 0;
}

2
drivers/staging/greybus/endo.h
View file

@ -46,8 +46,6 @@ struct gb_endo {
};
#define to_gb_endo(d) container_of(d, struct gb_endo, dev)
extern struct ida greybus_endo_id_map;
/* Greybus "private" definitions */
struct greybus_host_device;