diff options
author | Sebastian Ott <sebott@linux.vnet.ibm.com> | 2010-02-26 21:37:28 (GMT) |
---|---|---|
committer | Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> | 2010-02-26 21:37:29 (GMT) |
commit | 76e6fb4b86446e4605379b99ad3dd3f96bb1696f (patch) | |
tree | 0d123c6e1091d28ec87d98e76e037cfe8919942f /drivers/s390/cio/device_fsm.c | |
parent | b4c707214c987da021d4d5c4ed54612cf73d80d6 (diff) | |
download | linux-fsl-qoriq-76e6fb4b86446e4605379b99ad3dd3f96bb1696f.tar.xz |
[S390] ccw_device_notify: improve return codes
Callers of ccw_device_notify could not distinguish between a driver
who has no notifier registered and a driver who doesn't want to keep
a device after a certain event. Change this by adding proper return
codes.
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/cio/device_fsm.c')
-rw-r--r-- | drivers/s390/cio/device_fsm.c | 39 |
1 files changed, 31 insertions, 8 deletions
diff --git a/drivers/s390/cio/device_fsm.c b/drivers/s390/cio/device_fsm.c index ae76065..2cb01861c 100644 --- a/drivers/s390/cio/device_fsm.c +++ b/drivers/s390/cio/device_fsm.c @@ -313,21 +313,43 @@ ccw_device_sense_id_done(struct ccw_device *cdev, int err) } } +/** + * ccw_device_notify() - inform the device's driver about an event + * @cdev: device for which an event occured + * @event: event that occurred + * + * Returns: + * -%EINVAL if the device is offline or has no driver. + * -%EOPNOTSUPP if the device's driver has no notifier registered. + * %NOTIFY_OK if the driver wants to keep the device. + * %NOTIFY_BAD if the driver doesn't want to keep the device. + */ int ccw_device_notify(struct ccw_device *cdev, int event) { + int ret = -EINVAL; + if (!cdev->drv) - return 0; + goto out; if (!cdev->online) - return 0; + goto out; CIO_MSG_EVENT(2, "notify called for 0.%x.%04x, event=%d\n", cdev->private->dev_id.ssid, cdev->private->dev_id.devno, event); - return cdev->drv->notify ? cdev->drv->notify(cdev, event) : 0; + if (!cdev->drv->notify) { + ret = -EOPNOTSUPP; + goto out; + } + if (cdev->drv->notify(cdev, event)) + ret = NOTIFY_OK; + else + ret = NOTIFY_BAD; +out: + return ret; } static void ccw_device_oper_notify(struct ccw_device *cdev) { - if (ccw_device_notify(cdev, CIO_OPER)) { + if (ccw_device_notify(cdev, CIO_OPER) == NOTIFY_OK) { /* Reenable channel measurements, if needed. */ ccw_device_sched_todo(cdev, CDEV_TODO_ENABLE_CMF); return; @@ -361,14 +383,15 @@ ccw_device_done(struct ccw_device *cdev, int state) case DEV_STATE_BOXED: CIO_MSG_EVENT(0, "Boxed device %04x on subchannel %04x\n", cdev->private->dev_id.devno, sch->schid.sch_no); - if (cdev->online && !ccw_device_notify(cdev, CIO_BOXED)) + if (cdev->online && + ccw_device_notify(cdev, CIO_BOXED) != NOTIFY_OK) ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); cdev->private->flags.donotify = 0; break; case DEV_STATE_NOT_OPER: CIO_MSG_EVENT(0, "Device %04x gone on subchannel %04x\n", cdev->private->dev_id.devno, sch->schid.sch_no); - if (!ccw_device_notify(cdev, CIO_GONE)) + if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK) ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); else ccw_device_set_disconnected(cdev); @@ -378,7 +401,7 @@ ccw_device_done(struct ccw_device *cdev, int state) CIO_MSG_EVENT(0, "Disconnected device %04x on subchannel " "%04x\n", cdev->private->dev_id.devno, sch->schid.sch_no); - if (!ccw_device_notify(cdev, CIO_NO_PATH)) + if (ccw_device_notify(cdev, CIO_NO_PATH) != NOTIFY_OK) ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); else ccw_device_set_disconnected(cdev); @@ -586,7 +609,7 @@ ccw_device_offline(struct ccw_device *cdev) static void ccw_device_generic_notoper(struct ccw_device *cdev, enum dev_event dev_event) { - if (!ccw_device_notify(cdev, CIO_GONE)) + if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK) ccw_device_sched_todo(cdev, CDEV_TODO_UNREG); else ccw_device_set_disconnected(cdev); |