[SCSI] scsi_error: add target reset handler

The problem is that serveral drivers are sending a target reset from the
device reset handler, and if we have multiple devices a target reset gets
sent for each device when only one would be sufficient. And if we do a target
reset it affects all the commands on the target so the device reset handler
code only cleaning up one devices's commands makes programming the driver a
little more difficult than it should be.

This patch adds a target reset handler, which drivers can use to send
a target reset. If successful it cleans up the commands for a devices
accessed through that starget.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

2 files changed, 2 insertions, 0 deletions

diff --git a/include/scsi/scsi_eh.h b/include/scsi/scsi_eh.h
index 25071d5d9bf8..37a7614f62f4 100644
--- a/include/scsi/scsi_eh.h
+++ b/include/scsi/scsi_eh.h
@@ -64,6 +64,7 @@ extern int scsi_get_sense_info_fld(const u8 * sense_buffer, int sb_len,
 #define SCSI_TRY_RESET_DEVICE   1
 #define SCSI_TRY_RESET_BUS      2
 #define SCSI_TRY_RESET_HOST     3
+#define SCSI_TRY_RESET_TARGET   4
 
 extern int scsi_reset_provider(struct scsi_device *, int);
 
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index 530ff4c553f8..49132862bfaa 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -172,6 +172,7 @@ struct scsi_host_template {
          */
         int (* eh_abort_handler)(struct scsi_cmnd *);
         int (* eh_device_reset_handler)(struct scsi_cmnd *);
+        int (* eh_target_reset_handler)(struct scsi_cmnd *);
         int (* eh_bus_reset_handler)(struct scsi_cmnd *);
         int (* eh_host_reset_handler)(struct scsi_cmnd *);