A patch to allow .shutdown to execute asynchronously. Some devices may take a long time to complete a shutdown, so this patch lets a driver safely shutdown multiple devices asynchronously.
This uses an exclusive asynchronous domain so other unrelated async tasks can't cause shutdown to hold up indefinitely. Signed-off-by: Keith Busch <[email protected]> --- drivers/base/core.c | 4 ++++ include/linux/device.h | 1 + 2 files changed, 5 insertions(+) diff --git a/drivers/base/core.c b/drivers/base/core.c index 20da3ad..71b83bb 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -10,6 +10,7 @@ * */ +#include <linux/async.h> #include <linux/device.h> #include <linux/err.h> #include <linux/init.h> @@ -1926,6 +1927,8 @@ out: } EXPORT_SYMBOL_GPL(device_move); +ASYNC_DOMAIN_EXCLUSIVE(shutdown_domain); +EXPORT_SYMBOL(shutdown_domain); /** * device_shutdown - call ->shutdown() on each device to shutdown. */ @@ -1986,6 +1989,7 @@ void device_shutdown(void) spin_lock(&devices_kset->list_lock); } spin_unlock(&devices_kset->list_lock); + async_synchronize_full_domain(&shutdown_domain); } /* diff --git a/include/linux/device.h b/include/linux/device.h index d1d1c05..95ed9f1 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -997,6 +997,7 @@ static inline int devtmpfs_mount(const char *mountpoint) { return 0; } /* drivers/base/power/shutdown.c */ extern void device_shutdown(void); +extern struct async_domain shutdown_domain; /* debugging and troubleshooting/diagnostic helpers. */ extern const char *dev_driver_string(const struct device *dev); -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
