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authorMike Christie <michaelc@cs.wisc.edu>2010-07-22 16:59:49 +0530
committerJames Bottomley <James.Bottomley@suse.de>2010-07-28 09:06:06 -0500
commitc01be6dcb2b5cce4feaf48035be6395e5cd7d47c (patch)
treeb3080a6410e46a6c84bb6315bd56cc9fe085d874
parentfe4f0bdeea788a8ac049c097895cb2e4044f18b1 (diff)
[SCSI] iscsi_transport: wait on session in error handler path
wait for session to come online in eh_device_reset_handler and eh_target_reset_handler Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com> Signed-off-by: Ravi Anand <ravi.anand@qlogic.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
-rw-r--r--drivers/scsi/qla4xxx/ql4_os.c11
-rw-r--r--drivers/scsi/scsi_transport_iscsi.c32
-rw-r--r--include/scsi/scsi_transport_iscsi.h2
3 files changed, 44 insertions, 1 deletions
diff --git a/drivers/scsi/qla4xxx/ql4_os.c b/drivers/scsi/qla4xxx/ql4_os.c
index 821384147a4..5529b2a3974 100644
--- a/drivers/scsi/qla4xxx/ql4_os.c
+++ b/drivers/scsi/qla4xxx/ql4_os.c
@@ -2020,6 +2020,11 @@ static int qla4xxx_eh_device_reset(struct scsi_cmnd *cmd)
if (!ddb_entry)
return ret;
+ ret = iscsi_block_scsi_eh(cmd);
+ if (ret)
+ return ret;
+ ret = FAILED;
+
ql4_printk(KERN_INFO, ha,
"scsi%ld:%d:%d:%d: DEVICE RESET ISSUED.\n", ha->host_no,
cmd->device->channel, cmd->device->id, cmd->device->lun);
@@ -2072,11 +2077,15 @@ static int qla4xxx_eh_target_reset(struct scsi_cmnd *cmd)
{
struct scsi_qla_host *ha = to_qla_host(cmd->device->host);
struct ddb_entry *ddb_entry = cmd->device->hostdata;
- int stat;
+ int stat, ret;
if (!ddb_entry)
return FAILED;
+ ret = iscsi_block_scsi_eh(cmd);
+ if (ret)
+ return ret;
+
starget_printk(KERN_INFO, scsi_target(cmd->device),
"WARM TARGET RESET ISSUED.\n");
diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index d4b96623aa5..e84026def1f 100644
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -30,6 +30,7 @@
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_iscsi.h>
#include <scsi/iscsi_if.h>
+#include <scsi/scsi_cmnd.h>
#define ISCSI_SESSION_ATTRS 23
#define ISCSI_CONN_ATTRS 13
@@ -534,6 +535,37 @@ static void iscsi_scan_session(struct work_struct *work)
atomic_dec(&ihost->nr_scans);
}
+/**
+ * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
+ * cmd: scsi cmd passed to scsi eh handler
+ *
+ * If the session is down this function will wait for the recovery
+ * timer to fire or for the session to be logged back in. If the
+ * recovery timer fires then FAST_IO_FAIL is returned. The caller
+ * should pass this error value to the scsi eh.
+ */
+int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
+{
+ struct iscsi_cls_session *session =
+ starget_to_session(scsi_target(cmd->device));
+ unsigned long flags;
+ int ret = 0;
+
+ spin_lock_irqsave(&session->lock, flags);
+ while (session->state != ISCSI_SESSION_LOGGED_IN) {
+ if (session->state == ISCSI_SESSION_FREE) {
+ ret = FAST_IO_FAIL;
+ break;
+ }
+ spin_unlock_irqrestore(&session->lock, flags);
+ msleep(1000);
+ spin_lock_irqsave(&session->lock, flags);
+ }
+ spin_unlock_irqrestore(&session->lock, flags);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
+
static void session_recovery_timedout(struct work_struct *work)
{
struct iscsi_cls_session *session =
diff --git a/include/scsi/scsi_transport_iscsi.h b/include/scsi/scsi_transport_iscsi.h
index 349c7f30720..7fff94b3b2a 100644
--- a/include/scsi/scsi_transport_iscsi.h
+++ b/include/scsi/scsi_transport_iscsi.h
@@ -32,6 +32,7 @@ struct scsi_transport_template;
struct iscsi_transport;
struct iscsi_endpoint;
struct Scsi_Host;
+struct scsi_cmnd;
struct iscsi_cls_conn;
struct iscsi_conn;
struct iscsi_task;
@@ -255,5 +256,6 @@ extern int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time);
extern struct iscsi_endpoint *iscsi_create_endpoint(int dd_size);
extern void iscsi_destroy_endpoint(struct iscsi_endpoint *ep);
extern struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle);
+extern int iscsi_block_scsi_eh(struct scsi_cmnd *cmd);
#endif