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authorSwen Schillig <swen@vnet.ibm.com>2010-01-14 17:19:01 +0100
committerJames Bottomley <James.Bottomley@suse.de>2010-01-17 12:40:12 -0600
commit491ca4426ba153f79e72d1ca2a30c926484282b7 (patch)
tree44ad459ae8fa2521632d5a7f0f74bdf52409003c /drivers/s390/scsi
parentb8f08645f80a0c93246f3539ce53d3cae6a91fa0 (diff)
downloadop-kernel-dev-491ca4426ba153f79e72d1ca2a30c926484282b7.zip
op-kernel-dev-491ca4426ba153f79e72d1ca2a30c926484282b7.tar.gz
[SCSI] zfcp: Introduce bsg_timeout callback.
Introduce a zfcp callback for timeouts triggered from FC BSG. With zfcp, the underlying hardware cannot abort CT or ELS requests, so there is nothing to do when the block layer timeout expires. To avoid interference with the block layer timeout, simply indicate that the block layer timer should be reset. The timer running in the hardware for the pending CT or ELS request will return the request when it expires. Signed-off-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')
-rw-r--r--drivers/s390/scsi/zfcp_ext.h1
-rw-r--r--drivers/s390/scsi/zfcp_fc.c6
-rw-r--r--drivers/s390/scsi/zfcp_scsi.c1
3 files changed, 8 insertions, 0 deletions
diff --git a/drivers/s390/scsi/zfcp_ext.h b/drivers/s390/scsi/zfcp_ext.h
index 03dec83..1406a65 100644
--- a/drivers/s390/scsi/zfcp_ext.h
+++ b/drivers/s390/scsi/zfcp_ext.h
@@ -108,6 +108,7 @@ extern void zfcp_fc_wka_ports_force_offline(struct zfcp_fc_wka_ports *);
extern int zfcp_fc_gs_setup(struct zfcp_adapter *);
extern void zfcp_fc_gs_destroy(struct zfcp_adapter *);
extern int zfcp_fc_exec_bsg_job(struct fc_bsg_job *);
+extern int zfcp_fc_timeout_bsg_job(struct fc_bsg_job *);
/* zfcp_fsf.c */
extern int zfcp_fsf_open_port(struct zfcp_erp_action *);
diff --git a/drivers/s390/scsi/zfcp_fc.c b/drivers/s390/scsi/zfcp_fc.c
index 81d4375..37a0ca2 100644
--- a/drivers/s390/scsi/zfcp_fc.c
+++ b/drivers/s390/scsi/zfcp_fc.c
@@ -788,6 +788,12 @@ int zfcp_fc_exec_bsg_job(struct fc_bsg_job *job)
}
}
+int zfcp_fc_timeout_bsg_job(struct fc_bsg_job *job)
+{
+ /* hardware tracks timeout, reset bsg timeout to not interfere */
+ return -EAGAIN;
+}
+
int zfcp_fc_gs_setup(struct zfcp_adapter *adapter)
{
struct zfcp_fc_wka_ports *wka_ports;
diff --git a/drivers/s390/scsi/zfcp_scsi.c b/drivers/s390/scsi/zfcp_scsi.c
index 771cc53..8e6fc68 100644
--- a/drivers/s390/scsi/zfcp_scsi.c
+++ b/drivers/s390/scsi/zfcp_scsi.c
@@ -652,6 +652,7 @@ struct fc_function_template zfcp_transport_functions = {
.show_host_port_state = 1,
.show_host_active_fc4s = 1,
.bsg_request = zfcp_fc_exec_bsg_job,
+ .bsg_timeout = zfcp_fc_timeout_bsg_job,
/* no functions registered for following dynamic attributes but
directly set by LLDD */
.show_host_port_type = 1,
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