Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-rc-fixes-2.6

3 files changed, 104 insertions, 14 deletions

diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index 94e5167f260d..e36c21e06d31 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -400,6 +400,35 @@ static struct scsi_target *scsi_alloc_target(struct device *parent,
         return found_target;
 }
 
+struct work_queue_wrapper {
+        struct work_struct      work;
+        struct scsi_target      *starget;
+};
+
+static void scsi_target_reap_work(void *data) {
+        struct work_queue_wrapper *wqw = (struct work_queue_wrapper *)data;
+        struct scsi_target *starget = wqw->starget;
+        struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
+        unsigned long flags;
+
+        kfree(wqw);
+
+        spin_lock_irqsave(shost->host_lock, flags);
+
+        if (--starget->reap_ref == 0 && list_empty(&starget->devices)) {
+                list_del_init(&starget->siblings);
+                spin_unlock_irqrestore(shost->host_lock, flags);
+                device_del(&starget->dev);
+                transport_unregister_device(&starget->dev);
+                put_device(&starget->dev);
+                return;
+
+        }
+        spin_unlock_irqrestore(shost->host_lock, flags);
+
+        return;
+}
+
 /**
  * scsi_target_reap - check to see if target is in use and destroy if not
  *
@@ -411,19 +440,18 @@ static struct scsi_target *scsi_alloc_target(struct device *parent,
  */
 void scsi_target_reap(struct scsi_target *starget)
 {
-        struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
-        unsigned long flags;
-        spin_lock_irqsave(shost->host_lock, flags);
+        struct work_queue_wrapper *wqw = 
+                kzalloc(sizeof(struct work_queue_wrapper), GFP_ATOMIC);
 
-        if (--starget->reap_ref == 0 && list_empty(&starget->devices)) {
-                list_del_init(&starget->siblings);
-                spin_unlock_irqrestore(shost->host_lock, flags);
-                device_del(&starget->dev);
-                transport_unregister_device(&starget->dev);
-                put_device(&starget->dev);
+        if (!wqw) {
+                starget_printk(KERN_ERR, starget,
+                               "Failed to allocate memory in scsi_reap_target()\n");
                 return;
         }
-        spin_unlock_irqrestore(shost->host_lock, flags);
+
+        INIT_WORK(&wqw->work, scsi_target_reap_work, wqw);
+        wqw->starget = starget;
+        schedule_work(&wqw->work);
 }
 
 /**
diff --git a/drivers/scsi/scsi_transport_fc.c b/drivers/scsi/scsi_transport_fc.c
index 6cd5931d9a54..2a1a99a2ef56 100644
--- a/drivers/scsi/scsi_transport_fc.c
+++ b/drivers/scsi/scsi_transport_fc.c
@@ -105,6 +105,7 @@ static struct {
         { FC_PORTSTATE_LINKDOWN,        "Linkdown" },
         { FC_PORTSTATE_ERROR,           "Error" },
         { FC_PORTSTATE_LOOPBACK,        "Loopback" },
+        { FC_PORTSTATE_DELETED,         "Deleted" },
 };
 fc_enum_name_search(port_state, fc_port_state, fc_port_state_names)
 #define FC_PORTSTATE_MAX_NAMELEN        20
@@ -211,6 +212,7 @@ fc_bitfield_name_search(remote_port_roles, fc_remote_port_role_names)
 #define FC_MGMTSRVR_PORTID              0x00000a
 
 
+static void fc_shost_remove_rports(void  *data);
 static void fc_timeout_deleted_rport(void *data);
 static void fc_scsi_scan_rport(void *data);
 static void fc_rport_terminate(struct fc_rport  *rport);
@@ -318,6 +320,8 @@ static int fc_host_setup(struct transport_container *tc, struct device *dev,
         fc_host_next_rport_number(shost) = 0;
         fc_host_next_target_id(shost) = 0;
 
+        fc_host_flags(shost) = 0;
+        INIT_WORK(&fc_host_rport_del_work(shost), fc_shost_remove_rports, shost);
         return 0;
 }
 
@@ -387,6 +391,7 @@ show_fc_rport_##field (struct class_device *cdev, char *buf)		\
         struct fc_internal *i = to_fc_internal(shost->transportt);      \
         if ((i->f->get_rport_##field) &&                                \
             !((rport->port_state == FC_PORTSTATE_BLOCKED) ||            \
+              (rport->port_state == FC_PORTSTATE_DELETED) ||            \
               (rport->port_state == FC_PORTSTATE_NOTPRESENT)))          \
                 i->f->get_rport_##field(rport);                         \
         return snprintf(buf, sz, format_string, cast rport->field);     \
@@ -402,6 +407,7 @@ store_fc_rport_##field(struct class_device *cdev, const char *buf,	\
         struct Scsi_Host *shost = rport_to_shost(rport);                \
         struct fc_internal *i = to_fc_internal(shost->transportt);      \
         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||              \
+            (rport->port_state == FC_PORTSTATE_DELETED) ||              \
             (rport->port_state == FC_PORTSTATE_NOTPRESENT))             \
                 return -EBUSY;                                          \
         val = simple_strtoul(buf, NULL, 0);                             \
@@ -519,6 +525,7 @@ store_fc_rport_dev_loss_tmo(struct class_device *cdev, const char *buf,
         struct Scsi_Host *shost = rport_to_shost(rport);
         struct fc_internal *i = to_fc_internal(shost->transportt);
         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
+            (rport->port_state == FC_PORTSTATE_DELETED) ||
             (rport->port_state == FC_PORTSTATE_NOTPRESENT))
                 return -EBUSY;
         val = simple_strtoul(buf, NULL, 0);
@@ -1769,7 +1776,7 @@ fc_timeout_deleted_rport(void  *data)
         rport->maxframe_size = -1;
         rport->supported_classes = FC_COS_UNSPECIFIED;
         rport->roles = FC_RPORT_ROLE_UNKNOWN;
-        rport->port_state = FC_PORTSTATE_NOTPRESENT;
+        rport->port_state = FC_PORTSTATE_DELETED;
 
         /* remove the identifiers that aren't used in the consisting binding */
         switch (fc_host_tgtid_bind_type(shost)) {
@@ -1789,14 +1796,23 @@ fc_timeout_deleted_rport(void  *data)
                 break;
         }
 
-        spin_unlock_irqrestore(shost->host_lock, flags);
-
         /*
          * As this only occurs if the remote port (scsi target)
          * went away and didn't come back - we'll remove
          * all attached scsi devices.
+         *
+         * We'll schedule the shost work item to perform the actual removal
+         * to avoid recursion in the different flush calls if we perform
+         * the removal in each target - and there are lots of targets
+         * whose timeouts fire at the same time.
          */
-        fc_rport_tgt_remove(rport);
+
+        if ( !(fc_host_flags(shost) & FC_SHOST_RPORT_DEL_SCHEDULED)) {
+                fc_host_flags(shost) |= FC_SHOST_RPORT_DEL_SCHEDULED;
+                scsi_queue_work(shost, &fc_host_rport_del_work(shost));
+        }
+
+        spin_unlock_irqrestore(shost->host_lock, flags);
 }
 
 /**
@@ -1818,6 +1834,41 @@ fc_scsi_scan_rport(void *data)
 }
 
 
+/**
+ * fc_shost_remove_rports - called to remove all rports that are marked
+ *                       as in a deleted (not connected) state.
+ * 
+ * @data:       shost whose rports are to be looked at
+ **/
+static void
+fc_shost_remove_rports(void  *data)
+{
+        struct Scsi_Host *shost = (struct Scsi_Host *)data;
+        struct fc_rport *rport, *next_rport;
+        unsigned long flags;
+
+        spin_lock_irqsave(shost->host_lock, flags);
+        while (fc_host_flags(shost) & FC_SHOST_RPORT_DEL_SCHEDULED) {
+
+                fc_host_flags(shost) &= ~FC_SHOST_RPORT_DEL_SCHEDULED;
+
+restart_search:
+                list_for_each_entry_safe(rport, next_rport,
+                                &fc_host_rport_bindings(shost), peers) {
+                        if (rport->port_state == FC_PORTSTATE_DELETED) {
+                                rport->port_state = FC_PORTSTATE_NOTPRESENT;
+                                spin_unlock_irqrestore(shost->host_lock, flags);
+                                fc_rport_tgt_remove(rport);
+                                spin_lock_irqsave(shost->host_lock, flags);
+                                goto restart_search;
+                        }
+                }
+
+        }
+        spin_unlock_irqrestore(shost->host_lock, flags);
+}
+
+
 MODULE_AUTHOR("Martin Hicks");
 MODULE_DESCRIPTION("FC Transport Attributes");
 MODULE_LICENSE("GPL");
diff --git a/include/scsi/scsi_transport_fc.h b/include/scsi/scsi_transport_fc.h
index fac547d32a98..394f14a5b7cb 100644
--- a/include/scsi/scsi_transport_fc.h
+++ b/include/scsi/scsi_transport_fc.h
@@ -79,6 +79,7 @@ enum fc_port_state {
         FC_PORTSTATE_LINKDOWN,
         FC_PORTSTATE_ERROR,
         FC_PORTSTATE_LOOPBACK,
+        FC_PORTSTATE_DELETED,
 };
 
 
@@ -325,8 +326,14 @@ struct fc_host_attrs {
         struct list_head rport_bindings;
         u32 next_rport_number;
         u32 next_target_id;
+        u8 flags;
+        struct work_struct rport_del_work;
 };
 
+/* values for struct fc_host_attrs "flags" field: */
+#define FC_SHOST_RPORT_DEL_SCHEDULED    0x01
+
+
 #define fc_host_node_name(x) \
         (((struct fc_host_attrs *)(x)->shost_data)->node_name)
 #define fc_host_port_name(x)    \
@@ -365,6 +372,10 @@ struct fc_host_attrs {
         (((struct fc_host_attrs *)(x)->shost_data)->next_rport_number)
 #define fc_host_next_target_id(x) \
         (((struct fc_host_attrs *)(x)->shost_data)->next_target_id)
+#define fc_host_flags(x) \
+        (((struct fc_host_attrs *)(x)->shost_data)->flags)
+#define fc_host_rport_del_work(x) \
+        (((struct fc_host_attrs *)(x)->shost_data)->rport_del_work)
 
 
 /* The functions by which the transport class and the driver communicate */