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authorChristof Schmitt <christof.schmitt@de.ibm.com>2010-09-08 16:39:54 +0400
committerJames Bottomley <James.Bottomley@suse.de>2010-09-17 06:54:16 +0400
commitfdbd1c5e27dabfa950d4b0f52a20069aeaf67b9d (patch)
tree402ea45cf57a2fdcef7a6011a1c64bc7d43cc66e /drivers/s390/scsi/zfcp_ext.h
parente4b9857fe628b453983cac89473a11a76a1f5786 (diff)
downloadlinux-fdbd1c5e27dabfa950d4b0f52a20069aeaf67b9d.tar.xz
[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>
Diffstat (limited to 'drivers/s390/scsi/zfcp_ext.h')
-rw-r--r--drivers/s390/scsi/zfcp_ext.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/s390/scsi/zfcp_ext.h b/drivers/s390/scsi/zfcp_ext.h
index 5c3966eaca51..3c90604076e0 100644
--- a/drivers/s390/scsi/zfcp_ext.h
+++ b/drivers/s390/scsi/zfcp_ext.h
@@ -80,6 +80,7 @@ extern void zfcp_erp_modify_unit_status(struct zfcp_unit *, char *, void *, u32,
int);
extern void zfcp_erp_unit_reopen(struct zfcp_unit *, int, char *, void *);
extern void zfcp_erp_unit_shutdown(struct zfcp_unit *, int, char *, void *);
+extern void zfcp_erp_unit_shutdown_wait(struct zfcp_unit *, char *);
extern void zfcp_erp_unit_failed(struct zfcp_unit *, char *, void *);
extern int zfcp_erp_thread_setup(struct zfcp_adapter *);
extern void zfcp_erp_thread_kill(struct zfcp_adapter *);