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IB/core: lock client data with lists_rwsem 

An ib_client callback that is called with the lists_rwsem locked only for
read is protected from changes to the IB client lists, but not from
ib_unregister_device() freeing its client data. This is because
ib_unregister_device() will remove the device from the device list with
lists_rwsem locked for write, but perform the rest of the cleanup,
including the call to remove() without that lock.

Mark client data that is undergoing de-registration with a new going_down
flag in the client data context. Lock the client data list with lists_rwsem
for write in addition to using the spinlock, so that functions calling the
callback would be able to lock only lists_rwsem for read and let callbacks
sleep.

Since ib_unregister_client() now marks the client data context, no need for
remove() to search the context again, so pass the client data directly to
remove() callbacks.

Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: Haggai Eran <haggaie@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Haggai Eran 2015-07-30 17:50:14 +03:00 committed by Doug Ledford
parent 5aa44bb90f
commit 7c1eb45a22
16 changed files with 82 additions and 52 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/infiniband/core/cache.c
View File

@ -394,7 +394,7 @@ err:
kfree(device->cache.lmc_cache);
}
static void ib_cache_cleanup_one(struct ib_device *device)
static void ib_cache_cleanup_one(struct ib_device *device, void *client_data)
{
int p;

7
drivers/infiniband/core/cm.c
View File

@ -58,7 +58,7 @@ MODULE_DESCRIPTION("InfiniBand CM");
MODULE_LICENSE("Dual BSD/GPL");
static void cm_add_one(struct ib_device *device);
static void cm_remove_one(struct ib_device *device);
static void cm_remove_one(struct ib_device *device, void *client_data);
static struct ib_client cm_client = {
.name = "cm",
@ -3886,9 +3886,9 @@ free:
kfree(cm_dev);
}
static void cm_remove_one(struct ib_device *ib_device)
static void cm_remove_one(struct ib_device *ib_device, void *client_data)
{
struct cm_device *cm_dev;
struct cm_device *cm_dev = client_data;
struct cm_port *port;
struct ib_port_modify port_modify = {
.clr_port_cap_mask = IB_PORT_CM_SUP
@ -3896,7 +3896,6 @@ static void cm_remove_one(struct ib_device *ib_device)
unsigned long flags;
int i;
cm_dev = ib_get_client_data(ib_device, &cm_client);
if (!cm_dev)
return;

7
drivers/infiniband/core/cma.c
View File

@ -94,7 +94,7 @@ const char *rdma_event_msg(enum rdma_cm_event_type event)
EXPORT_SYMBOL(rdma_event_msg);
static void cma_add_one(struct ib_device *device);
static void cma_remove_one(struct ib_device *device);
static void cma_remove_one(struct ib_device *device, void *client_data);
static struct ib_client cma_client = {
.name = "cma",
@ -3554,11 +3554,10 @@ static void cma_process_remove(struct cma_device *cma_dev)
wait_for_completion(&cma_dev->comp);
}
static void cma_remove_one(struct ib_device *device)
static void cma_remove_one(struct ib_device *device, void *client_data)
{
struct cma_device *cma_dev;
struct cma_device *cma_dev = client_data;
cma_dev = ib_get_client_data(device, &cma_client);
if (!cma_dev)
return;

53
drivers/infiniband/core/device.c
View File

@ -50,6 +50,9 @@ struct ib_client_data {
struct list_head list;
struct ib_client *client;
void * data;
/* The device or client is going down. Do not call client or device
* callbacks other than remove(). */
bool going_down;
};
struct workqueue_struct *ib_wq;
@ -69,6 +72,8 @@ static LIST_HEAD(client_list);
* to the lists must be done with a write lock. A special case is when the
* device_mutex is locked. In this case locking the lists for read access is
* not necessary as the device_mutex implies it.
*
* lists_rwsem also protects access to the client data list.
*/
static DEFINE_MUTEX(device_mutex);
static DECLARE_RWSEM(lists_rwsem);
@ -210,10 +215,13 @@ static int add_client_context(struct ib_device *device, struct ib_client *client
context->client = client;
context->data = NULL;
context->going_down = false;
down_write(&lists_rwsem);
spin_lock_irqsave(&device->client_data_lock, flags);
list_add(&context->list, &device->client_data_list);
spin_unlock_irqrestore(&device->client_data_lock, flags);
up_write(&lists_rwsem);
return 0;
}
@ -339,7 +347,6 @@ EXPORT_SYMBOL(ib_register_device);
*/
void ib_unregister_device(struct ib_device *device)
{
struct ib_client *client;
struct ib_client_data *context, *tmp;
unsigned long flags;
@ -347,20 +354,29 @@ void ib_unregister_device(struct ib_device *device)
down_write(&lists_rwsem);
list_del(&device->core_list);
up_write(&lists_rwsem);
spin_lock_irqsave(&device->client_data_lock, flags);
list_for_each_entry_safe(context, tmp, &device->client_data_list, list)
context->going_down = true;
spin_unlock_irqrestore(&device->client_data_lock, flags);
downgrade_write(&lists_rwsem);
list_for_each_entry_reverse(client, &client_list, list)
if (client->remove)
client->remove(device);
list_for_each_entry_safe(context, tmp, &device->client_data_list,
list) {
if (context->client->remove)
context->client->remove(device, context->data);
}
up_read(&lists_rwsem);
mutex_unlock(&device_mutex);
ib_device_unregister_sysfs(device);
down_write(&lists_rwsem);
spin_lock_irqsave(&device->client_data_lock, flags);
list_for_each_entry_safe(context, tmp, &device->client_data_list, list)
kfree(context);
spin_unlock_irqrestore(&device->client_data_lock, flags);
up_write(&lists_rwsem);
device->reg_state = IB_DEV_UNREGISTERED;
}
@ -420,16 +436,35 @@ void ib_unregister_client(struct ib_client *client)
up_write(&lists_rwsem);
list_for_each_entry(device, &device_list, core_list) {
if (client->remove)
client->remove(device);
struct ib_client_data *found_context = NULL;
down_write(&lists_rwsem);
spin_lock_irqsave(&device->client_data_lock, flags);
list_for_each_entry_safe(context, tmp, &device->client_data_list, list)
if (context->client == client) {
list_del(&context->list);
kfree(context);
context->going_down = true;
found_context = context;
break;
}
spin_unlock_irqrestore(&device->client_data_lock, flags);
up_write(&lists_rwsem);
if (client->remove)
client->remove(device, found_context ?
found_context->data : NULL);
if (!found_context) {
pr_warn("No client context found for %s/%s\n",
device->name, client->name);
continue;
}
down_write(&lists_rwsem);
spin_lock_irqsave(&device->client_data_lock, flags);
list_del(&found_context->list);
kfree(found_context);
spin_unlock_irqrestore(&device->client_data_lock, flags);
up_write(&lists_rwsem);
}
mutex_unlock(&device_mutex);

2
drivers/infiniband/core/mad.c
View File

@ -3335,7 +3335,7 @@ error:
}
}
static void ib_mad_remove_device(struct ib_device *device)
static void ib_mad_remove_device(struct ib_device *device, void *client_data)
{
int i;

7
drivers/infiniband/core/multicast.c
View File

@ -43,7 +43,7 @@
#include "sa.h"
static void mcast_add_one(struct ib_device *device);
static void mcast_remove_one(struct ib_device *device);
static void mcast_remove_one(struct ib_device *device, void *client_data);
static struct ib_client mcast_client = {
.name = "ib_multicast",
@ -840,13 +840,12 @@ static void mcast_add_one(struct ib_device *device)
ib_register_event_handler(&dev->event_handler);
}
static void mcast_remove_one(struct ib_device *device)
static void mcast_remove_one(struct ib_device *device, void *client_data)
{
struct mcast_device *dev;
struct mcast_device *dev = client_data;
struct mcast_port *port;
int i;
dev = ib_get_client_data(device, &mcast_client);
if (!dev)
return;

6
drivers/infiniband/core/sa_query.c
View File

@ -107,7 +107,7 @@ struct ib_sa_mcmember_query {
};
static void ib_sa_add_one(struct ib_device *device);
static void ib_sa_remove_one(struct ib_device *device);
static void ib_sa_remove_one(struct ib_device *device, void *client_data);
static struct ib_client sa_client = {
.name = "sa",
@ -1221,9 +1221,9 @@ free:
return;
}
static void ib_sa_remove_one(struct ib_device *device)
static void ib_sa_remove_one(struct ib_device *device, void *client_data)
{
struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
struct ib_sa_device *sa_dev = client_data;
int i;
if (!sa_dev)

6
drivers/infiniband/core/ucm.c
View File

@ -109,7 +109,7 @@ enum {
#define IB_UCM_BASE_DEV MKDEV(IB_UCM_MAJOR, IB_UCM_BASE_MINOR)
static void ib_ucm_add_one(struct ib_device *device);
static void ib_ucm_remove_one(struct ib_device *device);
static void ib_ucm_remove_one(struct ib_device *device, void *client_data);
static struct ib_client ucm_client = {
.name = "ucm",
@ -1310,9 +1310,9 @@ err:
return;
}
static void ib_ucm_remove_one(struct ib_device *device)
static void ib_ucm_remove_one(struct ib_device *device, void *client_data)
{
struct ib_ucm_device *ucm_dev = ib_get_client_data(device, &ucm_client);
struct ib_ucm_device *ucm_dev = client_data;
if (!ucm_dev)
return;

6
drivers/infiniband/core/user_mad.c
View File

@ -133,7 +133,7 @@ static DEFINE_SPINLOCK(port_lock);
static DECLARE_BITMAP(dev_map, IB_UMAD_MAX_PORTS);
static void ib_umad_add_one(struct ib_device *device);
static void ib_umad_remove_one(struct ib_device *device);
static void ib_umad_remove_one(struct ib_device *device, void *client_data);
static void ib_umad_release_dev(struct kobject *kobj)
{
@ -1322,9 +1322,9 @@ free:
kobject_put(&umad_dev->kobj);
}
static void ib_umad_remove_one(struct ib_device *device)
static void ib_umad_remove_one(struct ib_device *device, void *client_data)
{
struct ib_umad_device *umad_dev = ib_get_client_data(device, &umad_client);
struct ib_umad_device *umad_dev = client_data;
int i;
if (!umad_dev)

6
drivers/infiniband/core/uverbs_main.c
View File

@ -128,7 +128,7 @@ static int (*uverbs_ex_cmd_table[])(struct ib_uverbs_file *file,
};
static void ib_uverbs_add_one(struct ib_device *device);
static void ib_uverbs_remove_one(struct ib_device *device);
static void ib_uverbs_remove_one(struct ib_device *device, void *client_data);
static void ib_uverbs_release_dev(struct kref *ref)
{
@ -948,9 +948,9 @@ err:
return;
}
static void ib_uverbs_remove_one(struct ib_device *device)
static void ib_uverbs_remove_one(struct ib_device *device, void *client_data)
{
struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client);
struct ib_uverbs_device *uverbs_dev = client_data;
if (!uverbs_dev)
return;

7
drivers/infiniband/ulp/ipoib/ipoib_main.c
View File

@ -89,7 +89,7 @@ struct workqueue_struct *ipoib_workqueue;
struct ib_sa_client ipoib_sa_client;
static void ipoib_add_one(struct ib_device *device);
static void ipoib_remove_one(struct ib_device *device);
static void ipoib_remove_one(struct ib_device *device, void *client_data);
static void ipoib_neigh_reclaim(struct rcu_head *rp);
static struct ib_client ipoib_client = {
@ -1715,12 +1715,11 @@ static void ipoib_add_one(struct ib_device *device)
ib_set_client_data(device, &ipoib_client, dev_list);
}
static void ipoib_remove_one(struct ib_device *device)
static void ipoib_remove_one(struct ib_device *device, void *client_data)
{
struct ipoib_dev_priv *priv, *tmp;
struct list_head *dev_list;
struct list_head *dev_list = client_data;
dev_list = ib_get_client_data(device, &ipoib_client);
if (!dev_list)
return;

6
drivers/infiniband/ulp/srp/ib_srp.c
View File

@ -131,7 +131,7 @@ MODULE_PARM_DESC(ch_count,
"Number of RDMA channels to use for communication with an SRP target. Using more than one channel improves performance if the HCA supports multiple completion vectors. The default value is the minimum of four times the number of online CPU sockets and the number of completion vectors supported by the HCA.");
static void srp_add_one(struct ib_device *device);
static void srp_remove_one(struct ib_device *device);
static void srp_remove_one(struct ib_device *device, void *client_data);
static void srp_recv_completion(struct ib_cq *cq, void *ch_ptr);
static void srp_send_completion(struct ib_cq *cq, void *ch_ptr);
static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
@ -3460,13 +3460,13 @@ free_attr:
kfree(dev_attr);
}
static void srp_remove_one(struct ib_device *device)
static void srp_remove_one(struct ib_device *device, void *client_data)
{
struct srp_device *srp_dev;
struct srp_host *host, *tmp_host;
struct srp_target_port *target;
srp_dev = ib_get_client_data(device, &srp_client);
srp_dev = client_data;
if (!srp_dev)
return;

5
drivers/infiniband/ulp/srpt/ib_srpt.c
View File

@ -3326,12 +3326,11 @@ err:
/**
* srpt_remove_one() - InfiniBand device removal callback function.
*/
static void srpt_remove_one(struct ib_device *device)
static void srpt_remove_one(struct ib_device *device, void *client_data)
{
struct srpt_device *sdev;
struct srpt_device *sdev = client_data;
int i;
sdev = ib_get_client_data(device, &srpt_client);
if (!sdev) {
pr_info("%s(%s): nothing to do.\n", __func__, device->name);
return;

4
include/rdma/ib_verbs.h
View File

@ -1550,6 +1550,8 @@ struct ib_device {
spinlock_t client_data_lock;
struct list_head core_list;
/* Access to the client_data_list is protected by the client_data_lock
* spinlock and the lists_rwsem read-write semaphore */
struct list_head client_data_list;
struct ib_cache cache;
@ -1761,7 +1763,7 @@ struct ib_device {
struct ib_client {
char *name;
void (*add) (struct ib_device *);
void (*remove)(struct ib_device *);
void (*remove)(struct ib_device *, void *client_data);
struct list_head list;
};

5
net/rds/ib.c
View File

@ -230,11 +230,10 @@ struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device)
*
* This can be called at any time and can be racing with any other RDS path.
*/
static void rds_ib_remove_one(struct ib_device *device)
static void rds_ib_remove_one(struct ib_device *device, void *client_data)
{
struct rds_ib_device *rds_ibdev;
struct rds_ib_device *rds_ibdev = client_data;
rds_ibdev = ib_get_client_data(device, &rds_ib_client);
if (!rds_ibdev)
return;

5
net/rds/iw.c
View File

@ -125,12 +125,11 @@ free_attr:
kfree(dev_attr);
}
static void rds_iw_remove_one(struct ib_device *device)
static void rds_iw_remove_one(struct ib_device *device, void *client_data)
{
struct rds_iw_device *rds_iwdev;
struct rds_iw_device *rds_iwdev = client_data;
struct rds_iw_cm_id *i_cm_id, *next;
rds_iwdev = ib_get_client_data(device, &rds_iw_client);
if (!rds_iwdev)
return;