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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 /drivers/scsi/scsi_transport_iscsi.c
parentfe4f0bdeea788a8ac049c097895cb2e4044f18b1 (diff)
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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>
Diffstat (limited to 'drivers/scsi/scsi_transport_iscsi.c')
-rw-r--r--drivers/scsi/scsi_transport_iscsi.c32
1 files changed, 32 insertions, 0 deletions
diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index d4b96623aa59..e84026def1f4 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 =