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greybus: hd: move CPort allocation to host-device code

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Move host-device CPort allocation to the host-device code.

Proper CPort allocation requires knowledge of the hardware and must be
handled by the host-device driver. This is an intermediate step that
moves the generic CPort-allocation code to the host-device code.

Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Johan Hovold 2016-05-11 10:17:59 +02:00 committed by Greg Kroah-Hartman
parent a8af16313d
commit 74a5d93cee
3 changed files with 37 additions and 22 deletions
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30
drivers/staging/greybus/connection.c
View File

@ -142,21 +142,8 @@ _gb_connection_create(struct gb_host_device *hd, int hd_cport_id,
unsigned long flags)
{
struct gb_connection *connection;
struct ida *id_map = &hd->cport_id_map;
int ida_start, ida_end;
int ret;
if (hd_cport_id < 0) {
ida_start = 0;
ida_end = hd->num_cports;
} else if (hd_cport_id < hd->num_cports) {
ida_start = hd_cport_id;
ida_end = hd_cport_id + 1;
} else {
dev_err(&hd->dev, "cport %d not available\n", hd_cport_id);
return ERR_PTR(-EINVAL);
}
mutex_lock(&gb_connection_mutex);
if (intf && gb_connection_intf_find(intf, cport_id)) {
@ -165,15 +152,17 @@ _gb_connection_create(struct gb_host_device *hd, int hd_cport_id,
goto err_unlock;
}
ret = ida_simple_get(id_map, ida_start, ida_end, GFP_KERNEL);
if (ret < 0)
ret = gb_hd_cport_allocate(hd, hd_cport_id);
if (ret < 0) {
dev_err(&hd->dev, "failed to allocate cport: %d\n", ret);
goto err_unlock;
}
hd_cport_id = ret;
connection = kzalloc(sizeof(*connection), GFP_KERNEL);
if (!connection) {
ret = -ENOMEM;
goto err_remove_ida;
goto err_hd_cport_release;
}
connection->hd_cport_id = hd_cport_id;
@ -219,8 +208,8 @@ _gb_connection_create(struct gb_host_device *hd, int hd_cport_id,
err_free_connection:
kfree(connection);
err_remove_ida:
ida_simple_remove(id_map, hd_cport_id);
err_hd_cport_release:
gb_hd_cport_release(hd, hd_cport_id);
err_unlock:
mutex_unlock(&gb_connection_mutex);
@ -658,8 +647,6 @@ EXPORT_SYMBOL_GPL(gb_connection_disable);
/* Caller must have disabled the connection before destroying it. */
void gb_connection_destroy(struct gb_connection *connection)
{
struct ida *id_map;
if (!connection)
return;
@ -672,8 +659,7 @@ void gb_connection_destroy(struct gb_connection *connection)
destroy_workqueue(connection->wq);
id_map = &connection->hd->cport_id_map;
ida_simple_remove(id_map, connection->hd_cport_id);
gb_hd_cport_release(connection->hd, connection->hd_cport_id);
connection->hd_cport_id = CPORT_ID_BAD;
mutex_unlock(&gb_connection_mutex);

26
drivers/staging/greybus/hd.c
View File

@ -39,6 +39,32 @@ static struct attribute *bus_attrs[] = {
};
ATTRIBUTE_GROUPS(bus);
/* Locking: Caller guarantees serialisation */
int gb_hd_cport_allocate(struct gb_host_device *hd, int cport_id)
{
struct ida *id_map = &hd->cport_id_map;
int ida_start, ida_end;
if (cport_id < 0) {
ida_start = 0;
ida_end = hd->num_cports;
} else if (cport_id < hd->num_cports) {
ida_start = cport_id;
ida_end = cport_id + 1;
} else {
dev_err(&hd->dev, "cport %d not available\n", cport_id);
return -EINVAL;
}
return ida_simple_get(id_map, ida_start, ida_end, GFP_KERNEL);
}
/* Locking: Caller guarantees serialisation */
void gb_hd_cport_release(struct gb_host_device *hd, u16 cport_id)
{
ida_simple_remove(&hd->cport_id_map, cport_id);
}
static void gb_hd_release(struct device *dev)
{
struct gb_host_device *hd = to_gb_host_device(dev);

3
drivers/staging/greybus/hd.h
View File

@ -50,6 +50,9 @@ struct gb_host_device {
};
#define to_gb_host_device(d) container_of(d, struct gb_host_device, dev)
int gb_hd_cport_allocate(struct gb_host_device *hd, int cport_id);
void gb_hd_cport_release(struct gb_host_device *hd, u16 cport_id);
struct gb_host_device *gb_hd_create(struct gb_hd_driver *driver,
struct device *parent,
size_t buffer_size_max,