[S390] cio: dont unregister a busy device in ccw_device_set_offline
If we detect a busy subchannel after the driver's set_offline callback returned in ccw_device_set_offline, the current behavior is to unregister the device, which may lead to undesired consequences. Change this to just quiesce the subchannel and go on with the offline processing. Note: This is no excuse for not fixing these drivers - after the set_offline callback they should have no running IO! Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>wifi-calibration
parent
de1b04388f
commit
d40f7b75a2
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@ -314,6 +314,8 @@ static void ccw_device_unregister(struct ccw_device *cdev)
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}
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}
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}
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}
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static void io_subchannel_quiesce(struct subchannel *);
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/**
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/**
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* ccw_device_set_offline() - disable a ccw device for I/O
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* ccw_device_set_offline() - disable a ccw device for I/O
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* @cdev: target ccw device
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* @cdev: target ccw device
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@ -327,7 +329,8 @@ static void ccw_device_unregister(struct ccw_device *cdev)
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*/
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*/
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int ccw_device_set_offline(struct ccw_device *cdev)
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int ccw_device_set_offline(struct ccw_device *cdev)
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{
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{
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int ret;
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struct subchannel *sch;
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int ret, state;
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if (!cdev)
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if (!cdev)
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return -ENODEV;
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return -ENODEV;
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@ -341,6 +344,7 @@ int ccw_device_set_offline(struct ccw_device *cdev)
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}
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}
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cdev->online = 0;
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cdev->online = 0;
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spin_lock_irq(cdev->ccwlock);
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spin_lock_irq(cdev->ccwlock);
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sch = to_subchannel(cdev->dev.parent);
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/* Wait until a final state or DISCONNECTED is reached */
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/* Wait until a final state or DISCONNECTED is reached */
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while (!dev_fsm_final_state(cdev) &&
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while (!dev_fsm_final_state(cdev) &&
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cdev->private->state != DEV_STATE_DISCONNECTED) {
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cdev->private->state != DEV_STATE_DISCONNECTED) {
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@ -349,9 +353,21 @@ int ccw_device_set_offline(struct ccw_device *cdev)
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cdev->private->state == DEV_STATE_DISCONNECTED));
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cdev->private->state == DEV_STATE_DISCONNECTED));
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spin_lock_irq(cdev->ccwlock);
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spin_lock_irq(cdev->ccwlock);
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}
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}
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ret = ccw_device_offline(cdev);
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do {
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if (ret)
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ret = ccw_device_offline(cdev);
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goto error;
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if (!ret)
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break;
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CIO_MSG_EVENT(0, "ccw_device_offline returned %d, device "
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"0.%x.%04x\n", ret, cdev->private->dev_id.ssid,
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cdev->private->dev_id.devno);
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if (ret != -EBUSY)
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goto error;
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state = cdev->private->state;
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spin_unlock_irq(cdev->ccwlock);
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io_subchannel_quiesce(sch);
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spin_lock_irq(cdev->ccwlock);
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cdev->private->state = state;
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} while (ret == -EBUSY);
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spin_unlock_irq(cdev->ccwlock);
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spin_unlock_irq(cdev->ccwlock);
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wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) ||
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wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) ||
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cdev->private->state == DEV_STATE_DISCONNECTED));
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cdev->private->state == DEV_STATE_DISCONNECTED));
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@ -368,9 +384,6 @@ int ccw_device_set_offline(struct ccw_device *cdev)
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return 0;
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return 0;
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error:
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error:
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CIO_MSG_EVENT(0, "ccw_device_offline returned %d, device 0.%x.%04x\n",
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ret, cdev->private->dev_id.ssid,
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cdev->private->dev_id.devno);
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cdev->private->state = DEV_STATE_OFFLINE;
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cdev->private->state = DEV_STATE_OFFLINE;
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dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
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dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
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spin_unlock_irq(cdev->ccwlock);
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spin_unlock_irq(cdev->ccwlock);
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@ -1059,8 +1072,6 @@ out_schedule:
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return 0;
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return 0;
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}
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}
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static void io_subchannel_quiesce(struct subchannel *);
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static int
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static int
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io_subchannel_remove (struct subchannel *sch)
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io_subchannel_remove (struct subchannel *sch)
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{
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{
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