Instead of representing the states "visible in sysfs" and
"has been removed from the target list" by a single state
variable, use two variables to represent this information.
Signed-off-by: Bart Van Assche <bart.vanass...@sandisk.com>
Cc: Johannes Thumshirn <jthumsh...@suse.de>
Cc: Christoph Hellwig <h...@lst.de>
Cc: Dan Williams <dan.j.willi...@intel.com>
Cc: stable <sta...@vger.kernel.org>
---
drivers/scsi/scsi_scan.c | 31 +++----------------------------
drivers/scsi/scsi_sysfs.c | 7 ++++---
include/scsi/scsi_device.h | 3 ++-
3 files changed, 9 insertions(+), 32 deletions(-)
diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index f9f3f82..80b8c3f 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -314,7 +314,6 @@ static void scsi_target_destroy(struct scsi_target *starget)
struct Scsi_Host *shost = dev_to_shost(dev->parent);
unsigned long flags;
- starget->state = STARGET_DEL;
transport_destroy_device(dev);
spin_lock_irqsave(shost->host_lock, flags);
if (shost->hostt->target_destroy)
@@ -379,19 +378,15 @@ static void scsi_target_reap_ref_release(struct kref
*kref)
struct scsi_target *starget
= container_of(kref, struct scsi_target, reap_ref);
- /*
- * if we get here and the target is still in the CREATED state that
- * means it was allocated but never made visible (because a scan
- * turned up no LUNs), so don't call device_del() on it.
- */
- if (starget->state != STARGET_CREATED) {
+ if (starget->visible) {
+ starget->visible = false;
transport_remove_device(&starget->dev);
device_del(&starget->dev);
}
scsi_target_destroy(starget);
}
-static void scsi_target_reap_ref_put(struct scsi_target *starget)
+void scsi_target_reap(struct scsi_target *starget)
{
kref_put(&starget->reap_ref, scsi_target_reap_ref_release);
}
@@ -437,7 +432,6 @@ static struct scsi_target *scsi_alloc_target(struct device
*parent,
starget->can_queue = 0;
INIT_LIST_HEAD(&starget->siblings);
INIT_LIST_HEAD(&starget->devices);
- starget->state = STARGET_CREATED;
starget->scsi_level = SCSI_2;
starget->max_target_blocked = SCSI_DEFAULT_TARGET_BLOCKED;
retry:
@@ -498,25 +492,6 @@ static struct scsi_target *scsi_alloc_target(struct device
*parent,
}
/**
- * scsi_target_reap - check to see if target is in use and destroy if not
- * @starget: target to be checked
- *
- * This is used after removing a LUN or doing a last put of the target
- * it checks atomically that nothing is using the target and removes
- * it if so.
- */
-void scsi_target_reap(struct scsi_target *starget)
-{
- /*
- * serious problem if this triggers: STARGET_DEL is only set in the if
- * the reap_ref drops to zero, so we're trying to do another final put
- * on an already released kref
- */
- BUG_ON(starget->state == STARGET_DEL);
- scsi_target_reap_ref_put(starget);
-}
-
-/**
* sanitize_inquiry_string - remove non-graphical chars from an INQUIRY result
string
* @s: INQUIRY result string to sanitize
* @len: length of the string
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index b333389..b9fb61a 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -974,7 +974,7 @@ static int scsi_target_add(struct scsi_target *starget)
{
int error;
- if (starget->state != STARGET_CREATED)
+ if (starget->visible)
return 0;
error = device_add(&starget->dev);
@@ -983,7 +983,7 @@ static int scsi_target_add(struct scsi_target *starget)
return error;
}
transport_add_device(&starget->dev);
- starget->state = STARGET_RUNNING;
+ starget->visible = true;
pm_runtime_set_active(&starget->dev);
pm_runtime_enable(&starget->dev);
@@ -1166,11 +1166,12 @@ void scsi_remove_target(struct device *dev)
*/
spin_lock_irqsave(shost->host_lock, flags);
list_for_each_entry(starget, &shost->__targets, siblings) {
- if (starget->state == STARGET_DEL)
+ if (starget->reaped)
continue;
if (starget->dev.parent == dev || &starget->dev == dev) {
/* assuming new targets arrive at the end */
kref_get(&starget->reap_ref);
+ starget->reaped = true;
spin_unlock_irqrestore(shost->host_lock, flags);
if (last)
scsi_target_reap(last);
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index fe89d7c..a734656 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -267,6 +267,8 @@ struct scsi_target {
unsigned int expecting_lun_change:1; /* A device has reported
* a 3F/0E UA, other devices on
* the same target will also. */
+ unsigned int visible:1; /* visible in sysfs */
+ unsigned int reaped:1; /* removed from target list */
/* commands actually active on LLD. */
atomic_t target_busy;
atomic_t target_blocked;
@@ -280,7 +282,6 @@ struct scsi_target {
#define SCSI_DEFAULT_TARGET_BLOCKED 3
char scsi_level;
- enum scsi_target_state state;
void *hostdata; /* available to low-level driver */
unsigned long starget_data[0]; /* for the transport */
/* starget_data must be the last element!!!! */
--
2.6.2.307.g37023ba
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