[SCSI] FC transport : Avoid device offline cases by stalling aborts until device unblocked

This moves the eh_timed_out functionality from the scsi_host_template
to the transport_template. Given that this is now a transport function,
the EH_RESET_TIMER case no longer caps the timer reschedulings. The
transport guarantees that this is not an infinite condition.

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/include/scsi/scsi_transport.h b/include/scsi/scsi_transport.h
index e7b1054adf86..b3657f111937 100644
--- a/include/scsi/scsi_transport.h
+++ b/include/scsi/scsi_transport.h
@@ -48,6 +48,17 @@ struct scsi_transport_template {
          * True if the transport wants to use a host-based work-queue
          */
         unsigned int create_work_queue : 1;
+
+        /*
+         * This is an optional routine that allows the transport to become
+         * involved when a scsi io timer fires. The return value tells the
+         * timer routine how to finish the io timeout handling:
+         * EH_HANDLED:          I fixed the error, please complete the command
+         * EH_RESET_TIMER:      I need more time, reset the timer and
+         *                      begin counting again
+         * EH_NOT_HANDLED       Begin normal error recovery
+         */
+        enum scsi_eh_timer_return (* eh_timed_out)(struct scsi_cmnd *);
 };
 
 #define transport_class_to_shost(tc) \