From: Mark Brown broonie@linaro.org
Help simplify the cleanup code for SPI master drivers by providing a managed master registration function, ensuring that the master is automatically unregistered whenever the device is unbound.
Signed-off-by: Mark Brown broonie@linaro.org --- Documentation/driver-model/devres.txt | 3 +++ drivers/spi/spi.c | 35 +++++++++++++++++++++++++++++++++++ include/linux/spi/spi.h | 2 ++ 3 files changed, 40 insertions(+)
diff --git a/Documentation/driver-model/devres.txt b/Documentation/driver-model/devres.txt index 3d9c2a7..5bdc8cb 100644 --- a/Documentation/driver-model/devres.txt +++ b/Documentation/driver-model/devres.txt @@ -303,3 +303,6 @@ PHY
SLAVE DMA ENGINE devm_acpi_dma_controller_register() + +SPI + devm_spi_register_master() diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index ced0703..3d34045 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -1245,6 +1245,41 @@ done: } EXPORT_SYMBOL_GPL(spi_register_master);
+static void devm_spi_unregister(struct device *dev, void *res) +{ + spi_unregister_master(*(struct spi_master **)res); +} + +/** + * dev_spi_register_master - register managed SPI master controller + * @dev: device managing SPI master + * @master: initialized master, originally from spi_alloc_master() + * Context: can sleep + * + * Register a SPI device as with spi_register_master() which will + * automatically be unregister + */ +int devm_spi_register_master(struct device *dev, struct spi_master *master) +{ + struct spi_master **ptr; + int ret; + + ptr = devres_alloc(devm_spi_unregister, sizeof(*ptr), GFP_KERNEL); + if (!ptr) + return -ENOMEM; + + ret = spi_register_master(master); + if (ret != 0) { + *ptr = master; + devres_add(dev, ptr); + } else { + devres_free(ptr); + } + + return ret; +} +EXPORT_SYMBOL_GPL(devm_spi_register_master); + static int __unregister(struct device *dev, void *null) { spi_unregister_device(to_spi_device(dev)); diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h index 887116d..4d634d6 100644 --- a/include/linux/spi/spi.h +++ b/include/linux/spi/spi.h @@ -434,6 +434,8 @@ extern struct spi_master * spi_alloc_master(struct device *host, unsigned size);
extern int spi_register_master(struct spi_master *master); +extern int devm_spi_register_master(struct device *dev, + struct spi_master *master); extern void spi_unregister_master(struct spi_master *master);
extern struct spi_master *spi_busnum_to_master(u16 busnum);