RDMA/cm: Allow ib_send_cm_drep() to be done under lock
The first thing ib_send_cm_drep() does is obtain the lock, so use the usual unlocked wrapper, locked actor pattern here. This avoids a sketchy lock/unlock sequence (which could allow state to change) during cm_destroy_id(). Link: https://lore.kernel.org/r/20200310092545.251365-13-leon@kernel.org Signed-off-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
parent
e029fdc068
commit
87cabf3e09
@ -85,6 +85,8 @@ static void cm_add_one(struct ib_device *device);
|
||||
static void cm_remove_one(struct ib_device *device, void *client_data);
|
||||
static int cm_send_dreq_locked(struct cm_id_private *cm_id_priv,
|
||||
const void *private_data, u8 private_data_len);
|
||||
static int cm_send_drep_locked(struct cm_id_private *cm_id_priv,
|
||||
void *private_data, u8 private_data_len);
|
||||
|
||||
static struct ib_client cm_client = {
|
||||
.name = "cm",
|
||||
@ -1100,8 +1102,8 @@ retest:
|
||||
spin_unlock_irq(&cm_id_priv->lock);
|
||||
break;
|
||||
case IB_CM_DREQ_RCVD:
|
||||
cm_send_drep_locked(cm_id_priv, NULL, 0);
|
||||
spin_unlock_irq(&cm_id_priv->lock);
|
||||
ib_send_cm_drep(cm_id, NULL, 0);
|
||||
break;
|
||||
default:
|
||||
spin_unlock_irq(&cm_id_priv->lock);
|
||||
@ -2685,51 +2687,60 @@ static void cm_format_drep(struct cm_drep_msg *drep_msg,
|
||||
private_data_len);
|
||||
}
|
||||
|
||||
int ib_send_cm_drep(struct ib_cm_id *cm_id,
|
||||
const void *private_data,
|
||||
u8 private_data_len)
|
||||
static int cm_send_drep_locked(struct cm_id_private *cm_id_priv,
|
||||
void *private_data, u8 private_data_len)
|
||||
{
|
||||
struct cm_id_private *cm_id_priv;
|
||||
struct ib_mad_send_buf *msg;
|
||||
unsigned long flags;
|
||||
void *data;
|
||||
int ret;
|
||||
|
||||
lockdep_assert_held(&cm_id_priv->lock);
|
||||
|
||||
if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
|
||||
return -EINVAL;
|
||||
|
||||
data = cm_copy_private_data(private_data, private_data_len);
|
||||
if (IS_ERR(data))
|
||||
return PTR_ERR(data);
|
||||
|
||||
cm_id_priv = container_of(cm_id, struct cm_id_private, id);
|
||||
spin_lock_irqsave(&cm_id_priv->lock, flags);
|
||||
if (cm_id->state != IB_CM_DREQ_RCVD) {
|
||||
pr_debug("%s: local_id %d, cm_idcm_id->state(%d) != IB_CM_DREQ_RCVD\n",
|
||||
__func__, be32_to_cpu(cm_id->local_id), cm_id->state);
|
||||
spin_unlock_irqrestore(&cm_id_priv->lock, flags);
|
||||
kfree(data);
|
||||
if (cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
|
||||
pr_debug(
|
||||
"%s: local_id %d, cm_idcm_id->state(%d) != IB_CM_DREQ_RCVD\n",
|
||||
__func__, be32_to_cpu(cm_id_priv->id.local_id),
|
||||
cm_id_priv->id.state);
|
||||
kfree(private_data);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
cm_set_private_data(cm_id_priv, data, private_data_len);
|
||||
cm_set_private_data(cm_id_priv, private_data, private_data_len);
|
||||
cm_enter_timewait(cm_id_priv);
|
||||
|
||||
ret = cm_alloc_msg(cm_id_priv, &msg);
|
||||
if (ret)
|
||||
goto out;
|
||||
return ret;
|
||||
|
||||
cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
|
||||
private_data, private_data_len);
|
||||
|
||||
ret = ib_post_send_mad(msg, NULL);
|
||||
if (ret) {
|
||||
spin_unlock_irqrestore(&cm_id_priv->lock, flags);
|
||||
cm_free_msg(msg);
|
||||
return ret;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
|
||||
int ib_send_cm_drep(struct ib_cm_id *cm_id, const void *private_data,
|
||||
u8 private_data_len)
|
||||
{
|
||||
struct cm_id_private *cm_id_priv =
|
||||
container_of(cm_id, struct cm_id_private, id);
|
||||
unsigned long flags;
|
||||
void *data;
|
||||
int ret;
|
||||
|
||||
data = cm_copy_private_data(private_data, private_data_len);
|
||||
if (IS_ERR(data))
|
||||
return PTR_ERR(data);
|
||||
|
||||
spin_lock_irqsave(&cm_id_priv->lock, flags);
|
||||
ret = cm_send_drep_locked(cm_id_priv, data, private_data_len);
|
||||
spin_unlock_irqrestore(&cm_id_priv->lock, flags);
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL(ib_send_cm_drep);
|
||||
|
Loading…
x
Reference in New Issue
Block a user