[SCSI] fix our current target reap infrastructure

This patch eliminates the reap_ref and replaces it with a proper kref.
On last put of this kref, the target is removed from visibility in
sysfs.  The final call to scsi_target_reap() for the device is done from
__scsi_remove_device() and only if the device was made visible.  This
ensures that the target disappears as soon as the last device is gone
rather than waiting until final release of the device (which is often
too long).

Reviewed-by: Alan Stern <stern@rowland.harvard.edu>
Tested-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Cc: stable@vger.kernel.org # delay backport by 2 months for field testing
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 1 insertions, 2 deletions

diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index 622e100561d2..ccabdc1c27ca 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -269,7 +269,7 @@ struct scsi_target {
         struct list_head        siblings;
         struct list_head        devices;
         struct device           dev;
-        unsigned int            reap_ref; /* protected by the host lock */
+        struct kref             reap_ref; /* last put renders target invisible */
         unsigned int            channel;
         unsigned int            id; /* target id ... replace
                                      * scsi_device.id eventually */
@@ -296,7 +296,6 @@ struct scsi_target {
 #define SCSI_DEFAULT_TARGET_BLOCKED     3
 
         char                    scsi_level;
-        struct execute_work     ew;
         enum scsi_target_state  state;
         void                    *hostdata; /* available to low-level driver */
         unsigned long           starget_data[0]; /* for the transport */