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author | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2013-01-08 09:10:31 -0800 |
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committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2013-01-09 09:07:56 -0800 |
commit | b666263b71cb1f3b96fb79e69de7f119062b0da2 (patch) | |
tree | 3bc8324eb817042d2eef13f459a7d2b668892fd3 /drivers | |
parent | bec7a4bbecf7da86b6e64bb78d22c92ea1ba4afe (diff) | |
download | linux-b666263b71cb1f3b96fb79e69de7f119062b0da2.tar.bz2 |
Input: document that unregistering managed devices is not necessary
Apparently some users of managed input devices are confused whether
input_unregister_device() is needed when working with them. Clarify
this in the kernel doc for devm_input_allocate_device(): in most cases
there is no need to call neither input_unregister_device() nor
input_free_device() when working with managed devices.
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/input/input.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/drivers/input/input.c b/drivers/input/input.c index ce01332f7b3a..c04469928925 100644 --- a/drivers/input/input.c +++ b/drivers/input/input.c @@ -1785,12 +1785,13 @@ static void devm_input_device_release(struct device *dev, void *res) * its driver (or binding fails). Once managed input device is allocated, * it is ready to be set up and registered in the same fashion as regular * input device. There are no special devm_input_device_[un]register() - * variants, regular ones work with both managed and unmanaged devices. + * variants, regular ones work with both managed and unmanaged devices, + * should you need them. In most cases however, managed input device need + * not be explicitly unregistered or freed. * * NOTE: the owner device is set up as parent of input device and users * should not override it. */ - struct input_dev *devm_input_allocate_device(struct device *dev) { struct input_dev *input; @@ -2004,6 +2005,17 @@ static void devm_input_device_unregister(struct device *dev, void *res) * Once device has been successfully registered it can be unregistered * with input_unregister_device(); input_free_device() should not be * called in this case. + * + * Note that this function is also used to register managed input devices + * (ones allocated with devm_input_allocate_device()). Such managed input + * devices need not be explicitly unregistered or freed, their tear down + * is controlled by the devres infrastructure. It is also worth noting + * that tear down of managed input devices is internally a 2-step process: + * registered managed input device is first unregistered, but stays in + * memory and can still handle input_event() calls (although events will + * not be delivered anywhere). The freeing of managed input device will + * happen later, when devres stack is unwound to the point where device + * allocation was made. */ int input_register_device(struct input_dev *dev) { |