scsi: libsas: direct call probe and destruct

In commit 87c8331fcf72 ("[SCSI] libsas: prevent domain rediscovery
competing with ata error handling") introduced disco mutex to prevent
rediscovery competing with ata error handling and put the whole
revalidation in the mutex. But the rphy add/remove needs to wait for the
error handling which also grabs the disco mutex. This may leads to dead
lock.So the probe and destruct event were introduce to do the rphy
add/remove asynchronously and out of the lock.

The asynchronously processed workers makes the whole discovery process
not atomic, the other events may interrupt the process. For example,
if a loss of signal event inserted before the probe event, the
sas_deform_port() is called and the port will be deleted.

And sas_port_delete() may run before the destruct event, but the
port-x:x is the top parent of end device or expander. This leads to
a kernel WARNING such as:

[   82.042979] sysfs group 'power' not found for kobject 'phy-1:0:22'
[   82.042983] ------------[ cut here ]------------
[   82.042986] WARNING: CPU: 54 PID: 1714 at fs/sysfs/group.c:237
sysfs_remove_group+0x94/0xa0
[   82.043059] Call trace:
[   82.043082] [<ffff0000082e7624>] sysfs_remove_group+0x94/0xa0
[   82.043085] [<ffff00000864e320>] dpm_sysfs_remove+0x60/0x70
[   82.043086] [<ffff00000863ee10>] device_del+0x138/0x308
[   82.043089] [<ffff00000869a2d0>] sas_phy_delete+0x38/0x60
[   82.043091] [<ffff00000869a86c>] do_sas_phy_delete+0x6c/0x80
[   82.043093] [<ffff00000863dc20>] device_for_each_child+0x58/0xa0
[   82.043095] [<ffff000008696f80>] sas_remove_children+0x40/0x50
[   82.043100] [<ffff00000869d1bc>] sas_destruct_devices+0x64/0xa0
[   82.043102] [<ffff0000080e93bc>] process_one_work+0x1fc/0x4b0
[   82.043104] [<ffff0000080e96c0>] worker_thread+0x50/0x490
[   82.043105] [<ffff0000080f0364>] kthread+0xfc/0x128
[   82.043107] [<ffff0000080836c0>] ret_from_fork+0x10/0x50

Make probe and destruct a direct call in the disco and revalidate function,
but put them outside the lock. The whole discovery or revalidate won't
be interrupted by other events. And the DISCE_PROBE and DISCE_DESTRUCT
event are deleted as a result of the direct call.

Introduce a new list to destruct the sas_port and put the port delete after
the destruct. This makes sure the right order of destroying the sysfs
kobject and fix the warning above.

In sas_ex_revalidate_domain() have a loop to find all broadcasted
device, and sometimes we have a chance to find the same expander twice.
Because the sas_port will be deleted at the end of the whole revalidate
process, sas_port with the same name cannot be added before this.
Otherwise the sysfs will complain of creating duplicate filename. Since
the LLDD will send broadcast for every device change, we can only
process one expander's revalidation.

[mkp: kbuild test robot warning]

Signed-off-by: Jason Yan <yanaijie@huawei.com>
CC: John Garry <john.garry@huawei.com>
CC: Johannes Thumshirn <jthumshirn@suse.de>
CC: Ewan Milne <emilne@redhat.com>
CC: Christoph Hellwig <hch@lst.de>
CC: Tomas Henzl <thenzl@redhat.com>
CC: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 18 insertions, 14 deletions

diff --git a/drivers/scsi/libsas/sas_discover.c b/drivers/scsi/libsas/sas_discover.c
index 14f714d05767..e4fd078e4175 100644
--- a/drivers/scsi/libsas/sas_discover.c
+++ b/drivers/scsi/libsas/sas_discover.c
@@ -212,13 +212,9 @@ void sas_notify_lldd_dev_gone(struct domain_device *dev)
         }
 }
 
-static void sas_probe_devices(struct work_struct *work)
+static void sas_probe_devices(struct asd_sas_port *port)
 {
         struct domain_device *dev, *n;
-        struct sas_discovery_event *ev = to_sas_discovery_event(work);
-        struct asd_sas_port *port = ev->port;
-
-        clear_bit(DISCE_PROBE, &port->disc.pending);
 
         /* devices must be domain members before link recovery and probe */
         list_for_each_entry(dev, &port->disco_list, disco_list_node) {
@@ -294,7 +290,6 @@ int sas_discover_end_dev(struct domain_device *dev)
         res = sas_notify_lldd_dev_found(dev);
         if (res)
                 return res;
-        sas_discover_event(dev->port, DISCE_PROBE);
 
         return 0;
 }
@@ -353,13 +348,9 @@ static void sas_unregister_common_dev(struct asd_sas_port *port, struct domain_d
         sas_put_device(dev);
 }
 
-static void sas_destruct_devices(struct work_struct *work)
+void sas_destruct_devices(struct asd_sas_port *port)
 {
         struct domain_device *dev, *n;
-        struct sas_discovery_event *ev = to_sas_discovery_event(work);
-        struct asd_sas_port *port = ev->port;
-
-        clear_bit(DISCE_DESTRUCT, &port->disc.pending);
 
         list_for_each_entry_safe(dev, n, &port->destroy_list, disco_list_node) {
                 list_del_init(&dev->disco_list_node);
@@ -370,6 +361,16 @@ static void sas_destruct_devices(struct work_struct *work)
         }
 }
 
+static void sas_destruct_ports(struct asd_sas_port *port)
+{
+        struct sas_port *sas_port, *p;
+
+        list_for_each_entry_safe(sas_port, p, &port->sas_port_del_list, del_list) {
+                list_del_init(&sas_port->del_list);
+                sas_port_delete(sas_port);
+        }
+}
+
 void sas_unregister_dev(struct asd_sas_port *port, struct domain_device *dev)
 {
         if (!test_bit(SAS_DEV_DESTROY, &dev->state) &&
@@ -384,7 +385,6 @@ void sas_unregister_dev(struct asd_sas_port *port, struct domain_device *dev)
         if (!test_and_set_bit(SAS_DEV_DESTROY, &dev->state)) {
                 sas_rphy_unlink(dev->rphy);
                 list_move_tail(&dev->disco_list_node, &port->destroy_list);
-                sas_discover_event(dev->port, DISCE_DESTRUCT);
         }
 }
 
@@ -490,6 +490,8 @@ static void sas_discover_domain(struct work_struct *work)
                 port->port_dev = NULL;
         }
 
+        sas_probe_devices(port);
+
         SAS_DPRINTK("DONE DISCOVERY on port %d, pid:%d, result:%d\n", port->id,
                     task_pid_nr(current), error);
 }
@@ -523,6 +525,10 @@ static void sas_revalidate_domain(struct work_struct *work)
                     port->id, task_pid_nr(current), res);
  out:
         mutex_unlock(&ha->disco_mutex);
+
+        sas_destruct_devices(port);
+        sas_destruct_ports(port);
+        sas_probe_devices(port);
 }
 
 /* ---------- Events ---------- */
@@ -578,10 +584,8 @@ void sas_init_disc(struct sas_discovery *disc, struct asd_sas_port *port)
         static const work_func_t sas_event_fns[DISC_NUM_EVENTS] = {
                 [DISCE_DISCOVER_DOMAIN] = sas_discover_domain,
                 [DISCE_REVALIDATE_DOMAIN] = sas_revalidate_domain,
-                [DISCE_PROBE] = sas_probe_devices,
                 [DISCE_SUSPEND] = sas_suspend_devices,
                 [DISCE_RESUME] = sas_resume_devices,
-                [DISCE_DESTRUCT] = sas_destruct_devices,
         };
 
         disc->pending = 0;