[SCSI] scsi: Added support for adapter and firmware reset

Added new sysfs attr 'host_reset' in scsi_sysfs.c to
perform adapter or firmware reset as suggested by
Mike Christie here:
http://marc.info/?l=linux-scsi&m=127359347111167&w=2

user/application can write "adapter" or "firmware" on
this attr and it will call newly added function hook
in scsi_host_template to call LDD adapter or firmware
reset implementation.

Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index f1f2644137b8..fc22ad9dba77 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -355,6 +355,19 @@ struct scsi_host_template {
          */
         enum blk_eh_timer_return (*eh_timed_out)(struct scsi_cmnd *);
 
+        /* This is an optional routine that allows transport to initiate
+         * LLD adapter or firmware reset using sysfs attribute.
+         *
+         * Return values: 0 on success, -ve value on failure.
+         *
+         * Status: OPTIONAL
+         */
+
+        int (*host_reset)(struct Scsi_Host *shost, int reset_type);
+#define SCSI_ADAPTER_RESET      1
+#define SCSI_FIRMWARE_RESET     2
+
+
         /*
          * Name of proc directory
          */