gpio: Automatically add lockdep keys

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In order to avoid lockdep boilerplate in individual drivers, turn the
gpiochip_add_data() function into a macro that creates a unique class
key for each driver.

Note that this has the slight disadvantage of adding a key for each
driver registered with the system. However, these keys are 8 bytes in
size, which is negligible and a small price to pay for generic
infrastructure.

Suggested-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Acked-by: Grygorii Strashko <grygorii.strashko@ti.com>
[renane __gpiochip_add_data() to gpiochip_add_data_with_key]
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

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Thierry Reding 2017-11-07 19:15:59 +01:00 • committed by Linus Walleij

parent 8302cf5852

commit 959bc7b22b

2 changed files with 47 additions and 30 deletions

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41

drivers/gpio/gpiolib.c

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36

include/linux/gpio/driver.h

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