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s390/dasd: fix handling of gone paths 

When a path is gone and dasd_generic_path_event is called with a
PE_PATH_GONE event, we must assume that any I/O request on that
subchannel is still running. This is unlike the dasd_generic_notify
handler and the CIO_NO_PATH event, which implies that the subchannel
has been cleared.
If dasd_generic_path_event finds that the path has been the last
usable path, it must not call dasd_generic_last_path_gone (which would
reset the state of running requests), but just set the
DASD_STOPPED_DC_WAIT bit.

Signed-off-by: Stefan Weinhuber <wein@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Stefan Weinhuber 2013-05-28 15:26:06 +02:00 committed by Martin Schwidefsky
parent b56433cb78
commit 8b811bae69
1 changed files with 10 additions and 2 deletions
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12
drivers/s390/block/dasd.c
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@ -3440,8 +3440,16 @@ void dasd_generic_path_event(struct ccw_device *cdev, int *path_event)
device->path_data.opm &= ~eventlpm;
device->path_data.ppm &= ~eventlpm;
device->path_data.npm &= ~eventlpm;
if (oldopm && !device->path_data.opm)
dasd_generic_last_path_gone(device);
if (oldopm && !device->path_data.opm) {
dev_warn(&device->cdev->dev,
"No verified channel paths remain "
"for the device\n");
DBF_DEV_EVENT(DBF_WARNING, device,
"%s", "last verified path gone");
dasd_eer_write(device, NULL, DASD_EER_NOPATH);
dasd_device_set_stop_bits(device,
DASD_STOPPED_DC_WAIT);
}
}
if (path_event[chp] & PE_PATH_AVAILABLE) {
device->path_data.opm &= ~eventlpm;