return 0;
}
-/* Only exported for the benefit of scsi_wait_scan */
-EXPORT_SYMBOL_GPL(scsi_complete_async_scans);
-
-#ifndef MODULE
-/*
- * For async scanning we need to wait for all the scans to complete before
- * trying to mount the root fs. Otherwise non-modular drivers may not be ready
- * yet.
- */
-late_initcall(scsi_complete_async_scans);
-#endif
-
/**
* scsi_unlock_floptical - unlock device via a special MODE SENSE command
* @sdev: scsi device to send command to
kfree(sdev);
goto out;
}
- blk_get_queue(sdev->request_queue);
+ WARN_ON_ONCE(!blk_get_queue(sdev->request_queue));
sdev->request_queue->queuedata = sdev;
scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun);
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)
return found_starget;
}
+/**
+ * scsi_target_reap_ref_release - remove target from visibility
+ * @kref: the reap_ref in the target being released
+ *
+ * Called on last put of reap_ref, which is the indication that no device
+ * under this target is visible anymore, so render the target invisible in
+ * sysfs. Note: we have to be in user context here because the target reaps
+ * should be done in places where the scsi device visibility is being removed.
+ */
+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) {
+ transport_remove_device(&starget->dev);
+ device_del(&starget->dev);
+ }
+ scsi_target_destroy(starget);
+}
+
+static void scsi_target_reap_ref_put(struct scsi_target *starget)
+{
+ kref_put(&starget->reap_ref, scsi_target_reap_ref_release);
+}
+
/**
* scsi_alloc_target - allocate a new or find an existing target
* @parent: parent of the target (need not be a scsi host)
+ shost->transportt->target_size;
struct scsi_target *starget;
struct scsi_target *found_target;
- int error;
+ int error, ref_got;
starget = kzalloc(size, GFP_KERNEL);
if (!starget) {
}
dev = &starget->dev;
device_initialize(dev);
- starget->reap_ref = 1;
+ kref_init(&starget->reap_ref);
dev->parent = get_device(parent);
dev_set_name(dev, "target%d:%d:%d", shost->host_no, channel, id);
dev->bus = &scsi_bus_type;
return starget;
found:
- found_target->reap_ref++;
+ /*
+ * release routine already fired if kref is zero, so if we can still
+ * take the reference, the target must be alive. If we can't, it must
+ * be dying and we need to wait for a new target
+ */
+ ref_got = kref_get_unless_zero(&found_target->reap_ref);
+
spin_unlock_irqrestore(shost->host_lock, flags);
- if (found_target->state != STARGET_DEL) {
+ if (ref_got) {
put_device(dev);
return found_target;
}
- /* Unfortunately, we found a dying target; need to
- * wait until it's dead before we can get a new one */
+ /*
+ * Unfortunately, we found a dying target; need to wait until it's
+ * dead before we can get a new one. There is an anomaly here. We
+ * *should* call scsi_target_reap() to balance the kref_get() of the
+ * reap_ref above. However, since the target being released, it's
+ * already invisible and the reap_ref is irrelevant. If we call
+ * scsi_target_reap() we might spuriously do another device_del() on
+ * an already invisible target.
+ */
put_device(&found_target->dev);
- flush_scheduled_work();
+ /*
+ * length of time is irrelevant here, we just want to yield the CPU
+ * for a tick to avoid busy waiting for the target to die.
+ */
+ msleep(1);
goto retry;
}
-static void scsi_target_reap_usercontext(struct work_struct *work)
-{
- struct scsi_target *starget =
- container_of(work, struct scsi_target, ew.work);
-
- transport_remove_device(&starget->dev);
- device_del(&starget->dev);
- scsi_target_destroy(starget);
-}
-
/**
* scsi_target_reap - check to see if target is in use and destroy if not
* @starget: target to be checked
*/
void scsi_target_reap(struct scsi_target *starget)
{
- struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
- unsigned long flags;
- enum scsi_target_state state;
- int empty = 0;
-
- spin_lock_irqsave(shost->host_lock, flags);
- state = starget->state;
- if (--starget->reap_ref == 0 && list_empty(&starget->devices)) {
- empty = 1;
- starget->state = STARGET_DEL;
- }
- spin_unlock_irqrestore(shost->host_lock, flags);
-
- if (!empty)
- return;
-
- BUG_ON(state == STARGET_DEL);
- if (state == STARGET_CREATED)
- scsi_target_destroy(starget);
- else
- execute_in_process_context(scsi_target_reap_usercontext,
- &starget->ew);
+ /*
+ * 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);
}
/**
if (*bflags & BLIST_RETRY_HWERROR)
sdev->retry_hwerror = 1;
+ if (*bflags & BLIST_NO_DIF)
+ sdev->no_dif = 1;
+
transport_configure_device(&sdev->sdev_gendev);
if (sdev->host->hostt->slave_configure) {
* LUNs even if it's older than SCSI-3.
* If BLIST_NOREPORTLUN is set, return 1 always.
* If BLIST_NOLUN is set, return 0 always.
+ * If starget->no_report_luns is set, return 1 always.
*
* Return:
* 0: scan completed (or no memory, so further scanning is futile)
* Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set.
* Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does
* support more than 8 LUNs.
+ * Don't attempt if the target doesn't support REPORT LUNS.
*/
if (bflags & BLIST_NOREPORTLUN)
return 1;
return 1;
if (bflags & BLIST_NOLUN)
return 0;
+ if (starget->no_report_luns)
+ return 1;
if (!(sdev = scsi_device_lookup_by_target(starget, 0))) {
sdev = scsi_alloc_sdev(starget, 0, NULL);
}
mutex_unlock(&shost->scan_mutex);
scsi_autopm_put_target(starget);
+ /*
+ * paired with scsi_alloc_target(). Target will be destroyed unless
+ * scsi_probe_and_add_lun made an underlying device visible
+ */
scsi_target_reap(starget);
put_device(&starget->dev);
out_reap:
scsi_autopm_put_target(starget);
- /* now determine if the target has any children at all
- * and if not, nuke it */
+ /*
+ * paired with scsi_alloc_target(): determine if the target has
+ * any children at all and if not, nuke it
+ */
scsi_target_reap(starget);
put_device(&starget->dev);
}
}
-static int do_scan_async(void *_data)
+static void do_scan_async(void *_data, async_cookie_t c)
{
struct async_scan_data *data = _data;
struct Scsi_Host *shost = data->shost;
do_scsi_scan_host(shost);
scsi_finish_async_scan(data);
- return 0;
}
/**
**/
void scsi_scan_host(struct Scsi_Host *shost)
{
- struct task_struct *p;
struct async_scan_data *data;
if (strncmp(scsi_scan_type, "none", 4) == 0)
return;
}
- p = kthread_run(do_scan_async, data, "scsi_scan_%d", shost->host_no);
- if (IS_ERR(p))
- do_scan_async(data);
+ /* register with the async subsystem so wait_for_device_probe()
+ * will flush this work
+ */
+ async_schedule(do_scan_async, data);
+
/* scsi_autopm_put_host(shost) is called in scsi_finish_async_scan() */
}
EXPORT_SYMBOL(scsi_scan_host);
projects / firefly-linux-kernel-4.4.55.git / blobdiff