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[SCSI] esp: tidy up target reference counting

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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>
This commit is contained in:
James Bottomley 2008-06-23 14:52:09 -05:00
parent eadc49b1a8
commit ec5e69f6d3
2 changed files with 20 additions and 11 deletions
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30
drivers/scsi/esp_scsi.c
View File

@ -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,

1
drivers/scsi/esp_scsi.h
View File

@ -322,7 +322,6 @@ struct esp_target_data {
u8 nego_goal_tags;
struct scsi_target *starget;
int starget_ref;
};
struct esp_event_ent {