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Commit a23ed009 authored by Stefan Haberland's avatar Stefan Haberland Committed by Martin Schwidefsky
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[S390] dasd: unit check handling during internal cio I/O 



React on unit checks during cio internal I/O.
Handle as unsolicited interrupt and advice cio to retry.

Signed-off-by: default avatarStefan Haberland <stefan.haberland@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 094f2100

drivers/s390/block/dasd.c

+23 −0
Original line number Diff line number Diff line
@@ -1186,6 +1186,29 @@ void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm, 
	dasd_schedule_device_bh(device);

}



enum uc_todo dasd_generic_uc_handler(struct ccw_device *cdev, struct irb *irb)

{

	struct dasd_device *device;



	device = dasd_device_from_cdev_locked(cdev);



	if (IS_ERR(device))

		goto out;

	if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||

	   device->state != device->target ||

	   !device->discipline->handle_unsolicited_interrupt){

		dasd_put_device(device);

		goto out;

	}



	dasd_device_clear_timer(device);

	device->discipline->handle_unsolicited_interrupt(device, irb);

	dasd_put_device(device);

out:

	return UC_TODO_RETRY;

}

EXPORT_SYMBOL_GPL(dasd_generic_uc_handler);



/*

 * If we have an error on a dasd_block layer request then we cancel

 * and return all further requests from the same dasd_block as well.

drivers/s390/block/dasd_eckd.c

+1 −0
Original line number Diff line number Diff line
@@ -3436,6 +3436,7 @@ static struct ccw_driver dasd_eckd_driver = { 
	.freeze      = dasd_generic_pm_freeze,

	.thaw	     = dasd_generic_restore_device,

	.restore     = dasd_generic_restore_device,

	.uc_handler  = dasd_generic_uc_handler,

};



/*

drivers/s390/block/dasd_int.h

+1 −0
Original line number Diff line number Diff line
@@ -617,6 +617,7 @@ int dasd_generic_notify(struct ccw_device *, int); 
void dasd_generic_handle_state_change(struct dasd_device *);

int dasd_generic_pm_freeze(struct ccw_device *);

int dasd_generic_restore_device(struct ccw_device *);

enum uc_todo dasd_generic_uc_handler(struct ccw_device *, struct irb *);



int dasd_generic_read_dev_chars(struct dasd_device *, int, void *, int);

char *dasd_get_sense(struct irb *);