From 2f17644d1cd0121daa0a997ff4eca5b3b44d1fae Mon Sep 17 00:00:00 2001 From: Sebastian Ott Date: Tue, 22 Sep 2009 22:58:33 +0200 Subject: [PATCH] [S390] cio: merge init calls Define initialization sequence of css and ccw bus init calls by merging them into a single init call. Also introduce channel_subsystem_init_sync to wait for the initialization of devices to finish. Signed-off-by: Sebastian Ott Signed-off-by: Martin Schwidefsky --- drivers/s390/cio/css.c | 65 ++++++++++++++++++++++++++++++++++----- drivers/s390/cio/device.c | 20 ++---------- drivers/s390/cio/device.h | 1 + 3 files changed, 61 insertions(+), 25 deletions(-) diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c index 393c73c47f87..95805da2bb26 100644 --- a/drivers/s390/cio/css.c +++ b/drivers/s390/cio/css.c @@ -601,8 +601,7 @@ static void css_process_crw(struct crw *crw0, struct crw *crw1, int overflow) css_evaluate_subchannel(mchk_schid, 0); } -static int __init -__init_channel_subsystem(struct subchannel_id schid, void *data) +static int __init setup_subchannel(struct subchannel_id schid, void *data) { struct subchannel *sch; int ret; @@ -854,14 +853,13 @@ static struct notifier_block css_power_notifier = { * The struct subchannel's are created during probing (except for the * static console subchannel). */ -static int __init -init_channel_subsystem (void) +static int __init css_bus_init(void) { int ret, i; ret = chsc_determine_css_characteristics(); if (ret == -ENOMEM) - goto out; /* No need to continue. */ + goto out; ret = chsc_alloc_sei_area(); if (ret) @@ -934,7 +932,6 @@ init_channel_subsystem (void) /* Enable default isc for I/O subchannels. */ isc_register(IO_SCH_ISC); - for_each_subchannel(__init_channel_subsystem, NULL); return 0; out_file: if (css_chsc_characteristics.secm) @@ -966,6 +963,60 @@ init_channel_subsystem (void) return ret; } +static void __init css_bus_cleanup(void) +{ + struct channel_subsystem *css; + int i; + + for (i = 0; i <= __MAX_CSSID; i++) { + css = channel_subsystems[i]; + device_unregister(&css->pseudo_subchannel->dev); + css->pseudo_subchannel = NULL; + if (css_chsc_characteristics.secm) + device_remove_file(&css->device, &dev_attr_cm_enable); + device_unregister(&css->device); + } + bus_unregister(&css_bus_type); + crw_unregister_handler(CRW_RSC_CSS); + chsc_free_sei_area(); + kfree(slow_subchannel_set); + isc_unregister(IO_SCH_ISC); +} + +static int __init channel_subsystem_init(void) +{ + int ret; + + ret = css_bus_init(); + if (ret) + return ret; + + ret = io_subchannel_init(); + if (ret) + css_bus_cleanup(); + + return ret; +} +subsys_initcall(channel_subsystem_init); + +/* + * Wait for the initialization of devices to finish, to make sure we are + * done with our setup if the search for the root device starts. + */ +static int __init channel_subsystem_init_sync(void) +{ + /* Allocate and register subchannels. */ + for_each_subchannel(setup_subchannel, NULL); + + /* Wait for the initialization of ccw devices to finish. */ + wait_event(ccw_device_init_wq, + atomic_read(&ccw_device_init_count) == 0); + flush_workqueue(ccw_device_work); + + return 0; +} +subsys_initcall_sync(channel_subsystem_init_sync); + int sch_is_pseudo_sch(struct subchannel *sch) { return sch == to_css(sch->dev.parent)->pseudo_subchannel; @@ -1135,7 +1186,5 @@ void css_driver_unregister(struct css_driver *cdrv) } EXPORT_SYMBOL_GPL(css_driver_unregister); -subsys_initcall(init_channel_subsystem); - MODULE_LICENSE("GPL"); EXPORT_SYMBOL(css_bus_type); diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c index 6527f3f34493..4093adc12f2c 100644 --- a/drivers/s390/cio/device.c +++ b/drivers/s390/cio/device.c @@ -170,8 +170,7 @@ atomic_t ccw_device_init_count; static void recovery_func(unsigned long data); -static int __init -init_ccw_bus_type (void) +int __init io_subchannel_init(void) { int ret; @@ -181,10 +180,10 @@ init_ccw_bus_type (void) ccw_device_work = create_singlethread_workqueue("cio"); if (!ccw_device_work) - return -ENOMEM; /* FIXME: better errno ? */ + return -ENOMEM; slow_path_wq = create_singlethread_workqueue("kslowcrw"); if (!slow_path_wq) { - ret = -ENOMEM; /* FIXME: better errno ? */ + ret = -ENOMEM; goto out_err; } if ((ret = bus_register (&ccw_bus_type))) @@ -194,9 +193,6 @@ init_ccw_bus_type (void) if (ret) goto out_err; - wait_event(ccw_device_init_wq, - atomic_read(&ccw_device_init_count) == 0); - flush_workqueue(ccw_device_work); return 0; out_err: if (ccw_device_work) @@ -206,16 +202,6 @@ init_ccw_bus_type (void) return ret; } -static void __exit -cleanup_ccw_bus_type (void) -{ - css_driver_unregister(&io_subchannel_driver); - bus_unregister(&ccw_bus_type); - destroy_workqueue(ccw_device_work); -} - -subsys_initcall(init_ccw_bus_type); -module_exit(cleanup_ccw_bus_type); /************************ device handling **************************/ diff --git a/drivers/s390/cio/device.h b/drivers/s390/cio/device.h index e3975107a578..ed39a2caaf47 100644 --- a/drivers/s390/cio/device.h +++ b/drivers/s390/cio/device.h @@ -74,6 +74,7 @@ dev_fsm_final_state(struct ccw_device *cdev) extern struct workqueue_struct *ccw_device_work; extern wait_queue_head_t ccw_device_init_wq; extern atomic_t ccw_device_init_count; +int __init io_subchannel_init(void); void io_subchannel_recog_done(struct ccw_device *cdev); void io_subchannel_init_config(struct subchannel *sch);