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Date: Wed, 5 Aug 2020 17:53:27 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Jason Yan <yanaijie@...wei.com>,
John Garry <john.garry@...wei.com>,
Johannes Thumshirn <jthumshirn@...e.de>,
Ewan Milne <emilne@...hat.com>, Christoph Hellwig <hch@....de>,
Tomas Henzl <thenzl@...hat.com>,
Dan Williams <dan.j.williams@...el.com>,
Hannes Reinecke <hare@...e.com>,
"Martin K. Petersen" <martin.petersen@...cle.com>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.14 1/8] Revert "scsi: libsas: direct call probe and destruct"
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
This reverts commit 3a156abd24346a3188eb7e88cf86386a409e0d02 which is
commit 0558f33c06bb910e2879e355192227a8e8f0219d upstream.
John writes:
This patch was one of a series from Jason to fix this WARN issue, below:
https://lore.kernel.org/linux-scsi/8f6e3763-2b04-23e8-f1ec-8ed3c58f55d3@huawei.com/
I'm doubtful that it should be taken in isolation. Maybe 1 or 2 other
patches are required.
The WARN was really annoying, so we could spend a bit of time to test a
backport of what is strictly required. Let us know.
Cc: Jason Yan <yanaijie@...wei.com>
CC: John Garry <john.garry@...wei.com>
CC: Johannes Thumshirn <jthumshirn@...e.de>
CC: Ewan Milne <emilne@...hat.com>
CC: Christoph Hellwig <hch@....de>
CC: Tomas Henzl <thenzl@...hat.com>
CC: Dan Williams <dan.j.williams@...el.com>
Cc: Hannes Reinecke <hare@...e.com>
Cc: Martin K. Petersen <martin.petersen@...cle.com>
Cc: Sasha Levin <sashal@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/scsi/libsas/sas_ata.c | 1 +
drivers/scsi/libsas/sas_discover.c | 32 ++++++++++++++------------------
drivers/scsi/libsas/sas_expander.c | 8 +++++---
drivers/scsi/libsas/sas_internal.h | 1 -
drivers/scsi/libsas/sas_port.c | 3 ---
include/scsi/libsas.h | 3 ++-
include/scsi/scsi_transport_sas.h | 1 -
7 files changed, 22 insertions(+), 27 deletions(-)
--- a/drivers/scsi/libsas/sas_ata.c
+++ b/drivers/scsi/libsas/sas_ata.c
@@ -730,6 +730,7 @@ int sas_discover_sata(struct domain_devi
if (res)
return res;
+ sas_discover_event(dev->port, DISCE_PROBE);
return 0;
}
--- a/drivers/scsi/libsas/sas_discover.c
+++ b/drivers/scsi/libsas/sas_discover.c
@@ -221,9 +221,13 @@ void sas_notify_lldd_dev_gone(struct dom
}
}
-static void sas_probe_devices(struct asd_sas_port *port)
+static void sas_probe_devices(struct work_struct *work)
{
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) {
@@ -299,6 +303,7 @@ int sas_discover_end_dev(struct domain_d
res = sas_notify_lldd_dev_found(dev);
if (res)
return res;
+ sas_discover_event(dev->port, DISCE_PROBE);
return 0;
}
@@ -357,9 +362,13 @@ static void sas_unregister_common_dev(st
sas_put_device(dev);
}
-void sas_destruct_devices(struct asd_sas_port *port)
+static void sas_destruct_devices(struct work_struct *work)
{
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);
@@ -370,16 +379,6 @@ void sas_destruct_devices(struct asd_sas
}
}
-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) &&
@@ -394,6 +393,7 @@ void sas_unregister_dev(struct asd_sas_p
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);
}
}
@@ -499,8 +499,6 @@ static void sas_discover_domain(struct w
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);
}
@@ -534,10 +532,6 @@ static void sas_revalidate_domain(struct
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 ---------- */
@@ -593,8 +587,10 @@ void sas_init_disc(struct sas_discovery
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;
--- a/drivers/scsi/libsas/sas_expander.c
+++ b/drivers/scsi/libsas/sas_expander.c
@@ -1946,8 +1946,7 @@ static void sas_unregister_devs_sas_addr
sas_port_delete_phy(phy->port, phy->phy);
sas_device_set_phy(found, phy->port);
if (phy->port->num_phys == 0)
- list_add_tail(&phy->port->del_list,
- &parent->port->sas_port_del_list);
+ sas_port_delete(phy->port);
phy->port = NULL;
}
}
@@ -2157,7 +2156,7 @@ int sas_ex_revalidate_domain(struct doma
struct domain_device *dev = NULL;
res = sas_find_bcast_dev(port_dev, &dev);
- if (res == 0 && dev) {
+ while (res == 0 && dev) {
struct expander_device *ex = &dev->ex_dev;
int i = 0, phy_id;
@@ -2169,6 +2168,9 @@ int sas_ex_revalidate_domain(struct doma
res = sas_rediscover(dev, phy_id);
i = phy_id + 1;
} while (i < ex->num_phys);
+
+ dev = NULL;
+ res = sas_find_bcast_dev(port_dev, &dev);
}
return res;
}
--- a/drivers/scsi/libsas/sas_internal.h
+++ b/drivers/scsi/libsas/sas_internal.h
@@ -98,7 +98,6 @@ int sas_try_ata_reset(struct asd_sas_phy
void sas_hae_reset(struct work_struct *work);
void sas_free_device(struct kref *kref);
-void sas_destruct_devices(struct asd_sas_port *port);
#ifdef CONFIG_SCSI_SAS_HOST_SMP
extern void sas_smp_host_handler(struct bsg_job *job, struct Scsi_Host *shost);
--- a/drivers/scsi/libsas/sas_port.c
+++ b/drivers/scsi/libsas/sas_port.c
@@ -66,7 +66,6 @@ static void sas_resume_port(struct asd_s
rc = sas_notify_lldd_dev_found(dev);
if (rc) {
sas_unregister_dev(port, dev);
- sas_destruct_devices(port);
continue;
}
@@ -220,7 +219,6 @@ void sas_deform_port(struct asd_sas_phy
if (port->num_phys == 1) {
sas_unregister_domain_devices(port, gone);
- sas_destruct_devices(port);
sas_port_delete(port->port);
port->port = NULL;
} else {
@@ -325,7 +323,6 @@ static void sas_init_port(struct asd_sas
INIT_LIST_HEAD(&port->dev_list);
INIT_LIST_HEAD(&port->disco_list);
INIT_LIST_HEAD(&port->destroy_list);
- INIT_LIST_HEAD(&port->sas_port_del_list);
spin_lock_init(&port->phy_list_lock);
INIT_LIST_HEAD(&port->phy_list);
port->ha = sas_ha;
--- a/include/scsi/libsas.h
+++ b/include/scsi/libsas.h
@@ -87,8 +87,10 @@ enum discover_event {
DISCE_DISCOVER_DOMAIN = 0U,
DISCE_REVALIDATE_DOMAIN = 1,
DISCE_PORT_GONE = 2,
+ DISCE_PROBE = 3,
DISCE_SUSPEND = 4,
DISCE_RESUME = 5,
+ DISCE_DESTRUCT = 6,
DISC_NUM_EVENTS = 7,
};
@@ -267,7 +269,6 @@ struct asd_sas_port {
struct list_head dev_list;
struct list_head disco_list;
struct list_head destroy_list;
- struct list_head sas_port_del_list;
enum sas_linkrate linkrate;
struct sas_work work;
--- a/include/scsi/scsi_transport_sas.h
+++ b/include/scsi/scsi_transport_sas.h
@@ -156,7 +156,6 @@ struct sas_port {
struct mutex phy_list_mutex;
struct list_head phy_list;
- struct list_head del_list; /* libsas only */
};
#define dev_to_sas_port(d) \
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