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authorCornelia Huck <cornelia.huck@de.ibm.com>2009-04-14 15:36:23 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2009-04-14 15:37:25 +0200
commitf3445a1a656bc26b07946cc6d20de1ef07c8d116 (patch)
tree5ef9f40b00ac142d7f7c5cf0bdab77998a319165 /drivers/s390/block/dasd.c
parent75cb71f3184f3dd5b78d991d5e0e047774865f5d (diff)
[S390] dasd: Use the new async framework for autoonlining.
The dasd driver can automatically online detected dasds, which especially important for finding the root device. Currently, it will wait for each online operation to finish individually, which may take long if many dasds need to be onlined. When using the new async framework, these onlining operations can run in parallel and presence of the root device is ensured by the fact that prepare_namespace() waits for all async threads to finish. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/block/dasd.c')
-rw-r--r--drivers/s390/block/dasd.c37
1 files changed, 25 insertions, 12 deletions
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index 0570794ccf1..d1815272c43 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -20,6 +20,7 @@
#include <linux/slab.h>
#include <linux/buffer_head.h>
#include <linux/hdreg.h>
+#include <linux/async.h>
#include <asm/ccwdev.h>
#include <asm/ebcdic.h>
@@ -480,8 +481,10 @@ static void dasd_change_state(struct dasd_device *device)
if (rc && rc != -EAGAIN)
device->target = device->state;
- if (device->state == device->target)
+ if (device->state == device->target) {
wake_up(&dasd_init_waitq);
+ dasd_put_device(device);
+ }
/* let user-space know that the device status changed */
kobject_uevent(&device->cdev->dev.kobj, KOBJ_CHANGE);
@@ -513,12 +516,15 @@ void dasd_kick_device(struct dasd_device *device)
*/
void dasd_set_target_state(struct dasd_device *device, int target)
{
+ dasd_get_device(device);
/* If we are in probeonly mode stop at DASD_STATE_READY. */
if (dasd_probeonly && target > DASD_STATE_READY)
target = DASD_STATE_READY;
if (device->target != target) {
- if (device->state == target)
+ if (device->state == target) {
wake_up(&dasd_init_waitq);
+ dasd_put_device(device);
+ }
device->target = target;
}
if (device->state != device->target)
@@ -2148,6 +2154,22 @@ dasd_exit(void)
* SECTION: common functions for ccw_driver use
*/
+static void dasd_generic_auto_online(void *data, async_cookie_t cookie)
+{
+ struct ccw_device *cdev = data;
+ int ret;
+
+ ret = ccw_device_set_online(cdev);
+ if (ret)
+ pr_warning("%s: Setting the DASD online failed with rc=%d\n",
+ dev_name(&cdev->dev), ret);
+ else {
+ struct dasd_device *device = dasd_device_from_cdev(cdev);
+ wait_event(dasd_init_waitq, _wait_for_device(device));
+ dasd_put_device(device);
+ }
+}
+
/*
* Initial attempt at a probe function. this can be simplified once
* the other detection code is gone.
@@ -2180,10 +2202,7 @@ int dasd_generic_probe(struct ccw_device *cdev,
*/
if ((dasd_get_feature(cdev, DASD_FEATURE_INITIAL_ONLINE) > 0 ) ||
(dasd_autodetect && dasd_busid_known(dev_name(&cdev->dev)) != 0))
- ret = ccw_device_set_online(cdev);
- if (ret)
- pr_warning("%s: Setting the DASD online failed with rc=%d\n",
- dev_name(&cdev->dev), ret);
+ async_schedule(dasd_generic_auto_online, cdev);
return 0;
}
@@ -2290,13 +2309,7 @@ int dasd_generic_set_online(struct ccw_device *cdev,
} else
pr_debug("dasd_generic device %s found\n",
dev_name(&cdev->dev));
-
- /* FIXME: we have to wait for the root device but we don't want
- * to wait for each single device but for all at once. */
- wait_event(dasd_init_waitq, _wait_for_device(device));
-
dasd_put_device(device);
-
return rc;
}