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authorChristof Schmitt <christof.schmitt@de.ibm.com>2010-09-08 14:39:54 +0200
committerJames Bottomley <James.Bottomley@suse.de>2010-09-17 04:54:16 +0200
commitfdbd1c5e27dabfa950d4b0f52a20069aeaf67b9d (patch)
tree402ea45cf57a2fdcef7a6011a1c64bc7d43cc66e /drivers/clocksource
parent[SCSI] zfcp: Remove ZFCP_SYSFS_FAILED macro and implement fcp_lun_show withou... (diff)
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[SCSI] zfcp: Allow running unit/LUN shutdown without acquiring reference
With the change for the LUN data to be part of the scsi_device, the slave_destroy callback will be the final call to the zfcp_erp_unit_shutdown function. The erp tries to acquire a reference to run the action asynchronously and fail, if it cannot get the reference. But calling scsi_device_get from slave_destroy will fail, because the scsi_device is already in the state SDEV_DEL. Introduce a new call into the zfcp erp to solve this: The function zfcp_erp_unit_shutdown_wait will close the LUN and wait for the erp to finish without acquiring an additional reference. The wait allows to omit the reference; the caller waiting for the erp to finish already has a reference that holds the struct in place. Reviewed-by: Swen Schillig <swen@vnet.ibm.com> Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
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