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[SCSI] zfcp: Fix deadlock when adding invalid LUN 

When adding an invalid LUN, there is a deadlock between the add
via scsi_scan_target and the slave_destroy handler: The handler
waits for the scan to complete, but for an invalid unit,
scsi_scan_target directly calls the slave_destroy handler.

Fix the deadlock by removing the wait in the slave_destroy
handler, it was not necessary anyway.

Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Christof Schmitt 2007-11-05 12:37:47 +01:00 committed by James Bottomley
parent e39c8877a4
commit 1de1b43b5f
4 changed files with 0 additions and 10 deletions
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2
drivers/s390/scsi/zfcp_aux.c
View File

@ -844,8 +844,6 @@ zfcp_unit_enqueue(struct zfcp_port *port, fcp_lun_t fcp_lun)
unit->sysfs_device.release = zfcp_sysfs_unit_release;
dev_set_drvdata(&unit->sysfs_device, unit);
init_waitqueue_head(&unit->scsi_scan_wq);
/* mark unit unusable as long as sysfs registration is not complete */
atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);

4
drivers/s390/scsi/zfcp_def.h
View File

@ -983,10 +983,6 @@ struct zfcp_unit {
struct scsi_device *device; /* scsi device struct pointer */
struct zfcp_erp_action erp_action; /* pending error recovery */
atomic_t erp_counter;
wait_queue_head_t scsi_scan_wq; /* can be used to wait until
all scsi_scan_target
requests have been
completed. */
};
/* FSF request */

1
drivers/s390/scsi/zfcp_erp.c
View File

@ -1609,7 +1609,6 @@ static void zfcp_erp_scsi_scan(struct work_struct *work)
scsi_scan_target(&rport->dev, 0, rport->scsi_target_id,
unit->scsi_lun, 0);
atomic_clear_mask(ZFCP_STATUS_UNIT_SCSI_WORK_PENDING, &unit->status);
wake_up(&unit->scsi_scan_wq);
zfcp_unit_put(unit);
kfree(p);
}

3
drivers/s390/scsi/zfcp_scsi.c
View File

@ -180,9 +180,6 @@ static void zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)
if (unit) {
zfcp_erp_wait(unit->port->adapter);
wait_event(unit->scsi_scan_wq,
atomic_test_mask(ZFCP_STATUS_UNIT_SCSI_WORK_PENDING,
&unit->status) == 0);
atomic_clear_mask(ZFCP_STATUS_UNIT_REGISTERED, &unit->status);
sdpnt->hostdata = NULL;
unit->device = NULL;