Commit 8b811bae authored May 28, 2013 by Stefan Weinhuber Committed by Martin Schwidefsky May 31, 2013

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>

parent b56433cb

drivers/s390/block/dasd.c

+10 −2

Original line number	Diff line number	Diff line
		@@ -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;