[SCSI] zfcp: Allow running unit/LUN shutdown without acquiring reference

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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>

...

This commit is contained in:

Christof Schmitt 2010-09-08 14:39:54 +02:00 • committed by James Bottomley

parent e4b9857fe6

commit fdbd1c5e27

2 changed files with 63 additions and 36 deletions

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98

drivers/s390/scsi/zfcp_erp.c

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1

drivers/s390/scsi/zfcp_ext.h

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