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driver core: Introduce device links reference counting

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If device_link_add() is invoked multiple times with the same supplier
and consumer combo, it will create the link on first addition and
return a pointer to the already existing link on all subsequent
additions.

The semantics for device_link_del() are quite different, it deletes
the link unconditionally, so multiple invocations are not allowed.

In other words, this snippet ...

    struct device *dev1, *dev2;
    struct device_link *link1, *link2;

    link1 = device_link_add(dev1, dev2, 0);
    link2 = device_link_add(dev1, dev2, 0);

    device_link_del(link1);
    device_link_del(link2);

... causes the following crash:

    WARNING: CPU: 4 PID: 2686 at drivers/base/power/runtime.c:1611 pm_runtime_drop_link+0x40/0x50
    [...]
    list_del corruption, 0000000039b800a4->prev is LIST_POISON2 (00000000ecf79852)
    kernel BUG at lib/list_debug.c:50!

The issue isn't as arbitrary as it may seem:  Imagine a device link
which is added in both the supplier's and the consumer's ->probe hook.
The two drivers can't just call device_link_del() in their ->remove hook
without coordination.

Fix by counting multiple additions and dropping the device link only
when the last addition is unwound.

Signed-off-by: Lukas Wunner <lukas@wunner.de>
[ rjw: Subject ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Lukas Wunner 2018-02-10 19:27:12 +01:00 committed by Rafael J. Wysocki
parent da997b22c4
commit ead18c23c2
2 changed files with 19 additions and 8 deletions
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25
drivers/base/core.c
View file

@ -196,8 +196,10 @@ struct device_link *device_link_add(struct device *consumer,
}
list_for_each_entry(link, &supplier->links.consumers, s_node)
if (link->consumer == consumer)
if (link->consumer == consumer) {
kref_get(&link->kref);
goto out;
}
link = kzalloc(sizeof(*link), GFP_KERNEL);
if (!link)
@ -222,6 +224,7 @@ struct device_link *device_link_add(struct device *consumer,
link->consumer = consumer;
INIT_LIST_HEAD(&link->c_node);
link->flags = flags;
kref_init(&link->kref);
/* Determine the initial link state. */
if (flags & DL_FLAG_STATELESS) {
@ -292,8 +295,10 @@ static void __device_link_free_srcu(struct rcu_head *rhead)
device_link_free(container_of(rhead, struct device_link, rcu_head));
}
static void __device_link_del(struct device_link *link)
static void __device_link_del(struct kref *kref)
{
struct device_link *link = container_of(kref, struct device_link, kref);
dev_info(link->consumer, "Dropping the link to %s\n",
dev_name(link->supplier));
@ -305,8 +310,10 @@ static void __device_link_del(struct device_link *link)
call_srcu(&device_links_srcu, &link->rcu_head, __device_link_free_srcu);
}
#else /* !CONFIG_SRCU */
static void __device_link_del(struct device_link *link)
static void __device_link_del(struct kref *kref)
{
struct device_link *link = container_of(kref, struct device_link, kref);
dev_info(link->consumer, "Dropping the link to %s\n",
dev_name(link->supplier));
@ -324,13 +331,15 @@ static void __device_link_del(struct device_link *link)
* @link: Device link to delete.
*
* The caller must ensure proper synchronization of this function with runtime
* PM.
* PM. If the link was added multiple times, it needs to be deleted as often.
* Care is required for hotplugged devices: Their links are purged on removal
* and calling device_link_del() is then no longer allowed.
*/
void device_link_del(struct device_link *link)
{
device_links_write_lock();
device_pm_lock();
__device_link_del(link);
kref_put(&link->kref, __device_link_del);
device_pm_unlock();
device_links_write_unlock();
}
@ -444,7 +453,7 @@ static void __device_links_no_driver(struct device *dev)
continue;
if (link->flags & DL_FLAG_AUTOREMOVE)
__device_link_del(link);
kref_put(&link->kref, __device_link_del);
else if (link->status != DL_STATE_SUPPLIER_UNBIND)
WRITE_ONCE(link->status, DL_STATE_AVAILABLE);
}
@ -597,13 +606,13 @@ static void device_links_purge(struct device *dev)
list_for_each_entry_safe_reverse(link, ln, &dev->links.suppliers, c_node) {
WARN_ON(link->status == DL_STATE_ACTIVE);
__device_link_del(link);
__device_link_del(&link->kref);
}
list_for_each_entry_safe_reverse(link, ln, &dev->links.consumers, s_node) {
WARN_ON(link->status != DL_STATE_DORMANT &&
link->status != DL_STATE_NONE);
__device_link_del(link);
__device_link_del(&link->kref);
}
device_links_write_unlock();

2
include/linux/device.h
View file

@ -769,6 +769,7 @@ enum device_link_state {
* @status: The state of the link (with respect to the presence of drivers).
* @flags: Link flags.
* @rpm_active: Whether or not the consumer device is runtime-PM-active.
* @kref: Count repeated addition of the same link.
* @rcu_head: An RCU head to use for deferred execution of SRCU callbacks.
*/
struct device_link {
@ -779,6 +780,7 @@ struct device_link {
enum device_link_state status;
u32 flags;
bool rpm_active;
struct kref kref;
#ifdef CONFIG_SRCU
struct rcu_head rcu_head;
#endif