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gpu: host1x: Use different lock classes for each client

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[ Upstream commit a24f98176d1efae2c37d3438c57a624d530d9c33 ]

To avoid false lockdep warnings, give each client lock a different
lock class, passed from the initialization site by macro.

Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Mikko Perttunen 2021-03-29 16:38:27 +03:00 committed by Greg Kroah-Hartman
parent 39af2f472f
commit 9576dd8955
2 changed files with 14 additions and 5 deletions
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10
drivers/gpu/host1x/bus.c
View File

@ -704,8 +704,9 @@ void host1x_driver_unregister(struct host1x_driver *driver)
EXPORT_SYMBOL(host1x_driver_unregister);
/**
* host1x_client_register() - register a host1x client
* __host1x_client_register() - register a host1x client
* @client: host1x client
* @key: lock class key for the client-specific mutex
*
* Registers a host1x client with each host1x controller instance. Note that
* each client will only match their parent host1x controller and will only be
@ -714,13 +715,14 @@ EXPORT_SYMBOL(host1x_driver_unregister);
* device and call host1x_device_init(), which will in turn call each client's
* &host1x_client_ops.init implementation.
*/
int host1x_client_register(struct host1x_client *client)
int __host1x_client_register(struct host1x_client *client,
struct lock_class_key *key)
{
struct host1x *host1x;
int err;
INIT_LIST_HEAD(&client->list);
mutex_init(&client->lock);
__mutex_init(&client->lock, "host1x client lock", key);
client->usecount = 0;
mutex_lock(&devices_lock);
@ -741,7 +743,7 @@ int host1x_client_register(struct host1x_client *client)
return 0;
}
EXPORT_SYMBOL(host1x_client_register);
EXPORT_SYMBOL(__host1x_client_register);
/**
* host1x_client_unregister() - unregister a host1x client

9
include/linux/host1x.h
View File

@ -320,7 +320,14 @@ static inline struct host1x_device *to_host1x_device(struct device *dev)
int host1x_device_init(struct host1x_device *device);
int host1x_device_exit(struct host1x_device *device);
int host1x_client_register(struct host1x_client *client);
int __host1x_client_register(struct host1x_client *client,
struct lock_class_key *key);
#define host1x_client_register(class) \
({ \
static struct lock_class_key __key; \
__host1x_client_register(class, &__key); \
})
int host1x_client_unregister(struct host1x_client *client);
int host1x_client_suspend(struct host1x_client *client);