[SCSI] esp: tidy up target reference counting

The esp driver currently does hand rolled reference counting of its
target.  It's much easier to do what it needs to do if it's plugged into
the mid-layer callbacks (target_alloc and target_destroy) which were
designed for this case, so do it this way and get rid of the internal
target reference count.

Acked-by: David S. Miller <davem@davemloft.net>
Cc: Stable Tree <stable@kernel.org>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

diff --git a/drivers/scsi/esp_scsi.c b/drivers/scsi/esp_scsi.c
index 305eddef5ca18fc16bf7bcac55eff9b8af101e05..59fbef08d690763920af4b7fac52752f30be0570 100644 (file)
--- a/drivers/scsi/esp_scsi.c
+++ b/drivers/scsi/esp_scsi.c
@@ -2359,6 +2359,24 @@ void scsi_esp_unregister(struct esp *esp)
 }
 EXPORT_SYMBOL(scsi_esp_unregister);
 
+static int esp_target_alloc(struct scsi_target *starget)
+{
+       struct esp *esp = shost_priv(dev_to_shost(&starget->dev));
+       struct esp_target_data *tp = &esp->target[starget->id];
+
+       tp->starget = starget;
+
+       return 0;
+}
+
+static void esp_target_destroy(struct scsi_target *starget)
+{
+       struct esp *esp = shost_priv(dev_to_shost(&starget->dev));
+       struct esp_target_data *tp = &esp->target[starget->id];
+
+       tp->starget = NULL;
+}
+
 static int esp_slave_alloc(struct scsi_device *dev)
 {
        struct esp *esp = shost_priv(dev->host);
@@ -2370,9 +2388,6 @@ static int esp_slave_alloc(struct scsi_device *dev)
                return -ENOMEM;
        dev->hostdata = lp;
 
-       tp->starget = dev->sdev_target;
-       tp->starget_ref++;
-
        spi_min_period(tp->starget) = esp->min_period;
        spi_max_offset(tp->starget) = 15;
 
@@ -2426,17 +2441,10 @@ static int esp_slave_configure(struct scsi_device *dev)
 
 static void esp_slave_destroy(struct scsi_device *dev)
 {
-       struct esp *esp = shost_priv(dev->host);
-       struct esp_target_data *tp = &esp->target[dev->id];
        struct esp_lun_data *lp = dev->hostdata;
 
        kfree(lp);
        dev->hostdata = NULL;
-
-       BUG_ON(tp->starget_ref <= 0);
-
-       if (!--tp->starget_ref)
-               tp->starget = NULL;
 }
 
 static int esp_eh_abort_handler(struct scsi_cmnd *cmd)
@@ -2616,6 +2624,8 @@ struct scsi_host_template scsi_esp_template = {
        .name                   = "esp",
        .info                   = esp_info,
        .queuecommand           = esp_queuecommand,
+       .target_alloc           = esp_target_alloc,
+       .target_destroy         = esp_target_destroy,
        .slave_alloc            = esp_slave_alloc,
        .slave_configure        = esp_slave_configure,
        .slave_destroy          = esp_slave_destroy,

diff --git a/drivers/scsi/esp_scsi.h b/drivers/scsi/esp_scsi.h
index 655e0b2240bf497eb9529723beea4c3e2118b542..bb43a138818805d6d3ca683c2c75ce27cef4d87e 100644 (file)
--- a/drivers/scsi/esp_scsi.h
+++ b/drivers/scsi/esp_scsi.h
@@ -322,7 +322,6 @@ struct esp_target_data {
        u8                      nego_goal_tags;
 
        struct scsi_target      *starget;
-       int                     starget_ref;
 };
 
 struct esp_event_ent {