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| author |   Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2021-03-21 18:38:32 -0700 |
|---|---|---|
| committer |   Wolfram Sang <wsa@kernel.org> | 2021-04-10 21:59:21 +0200 |
| commit | 5b5475826c5265cead7ce4ca6d34ec0c566c70aa (patch) | |
| tree | cc4e7b918d2eacf131398d59037c74649c873fd0 /include/linux/i2c.h | |
| parent | i2c: designware: Switch over to i2c_freq_mode_string() (diff) | |
| download | wireguard-linux-5b5475826c5265cead7ce4ca6d34ec0c566c70aa.tar.xz wireguard-linux-5b5475826c5265cead7ce4ca6d34ec0c566c70aa.zip | |
i2c: ensure timely release of driver-allocated resources
More and more drivers rely on devres to manage their resources, however
if bus' probe() and release() methods are not trivial and control some
of resources as well (for example enable or disable clocks, or attach
device to a power domain), we need to make sure that driver-allocated
resources are released immediately after driver's remove() method
returns, and not postponed until driver core gets around to releasing
resources. To fix that we open a new devres group before calling
driver's probe() and explicitly release it when we return from driver's
remove().
Tested-by: Jeff LaBundy <jeff@labundy.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Diffstat (limited to 'include/linux/i2c.h')
| -rw-r--r-- | include/linux/i2c.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/i2c.h b/include/linux/i2c.h index e5d8b9dad6bf..e8f2ac8c9c3d 100644 --- a/include/linux/i2c.h +++ b/include/linux/i2c.h @@ -309,6 +309,8 @@ struct i2c_driver { * userspace_devices list * @slave_cb: Callback when I2C slave mode of an adapter is used. The adapter * calls it to pass on slave events to the slave driver. + * @devres_group_id: id of the devres group that will be created for resources + * acquired when probing this device. * * An i2c_client identifies a single device (i.e. chip) connected to an * i2c bus. The behaviour exposed to Linux is defined by the driver @@ -337,6 +339,7 @@ struct i2c_client { #if IS_ENABLED(CONFIG_I2C_SLAVE) i2c_slave_cb_t slave_cb; /* callback for slave mode */ #endif + void *devres_group_id; /* ID of probe devres group */ }; #define to_i2c_client(d) container_of(d, struct i2c_client, dev) |