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[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>
This commit is contained in:
Mike Christie 2010-07-22 16:59:49 +05:30 committed by James Bottomley
parent fe4f0bdeea
commit c01be6dcb2
3 changed files with 44 additions and 1 deletions
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11
drivers/scsi/qla4xxx/ql4_os.c
View File

@ -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");

32
drivers/scsi/scsi_transport_iscsi.c
View File

@ -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 =

2
include/scsi/scsi_transport_iscsi.h
View File

@ -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