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IB/rdma_cm: Add wrapper for cma reference count

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Currently, cma users can't increase or decrease the cma reference
count. This is necassary when setting cma attributes (like the
default GID type) in order to avoid use-after-free errors.
Adding cma_ref_dev and cma_deref_dev APIs.

Signed-off-by: Matan Barak <matanb@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Matan Barak 2015-12-23 14:56:54 +02:00 committed by Doug Ledford
parent 200298326b
commit 218a773f76
2 changed files with 13 additions and 2 deletions
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11
drivers/infiniband/core/cma.c
View file

@ -60,6 +60,8 @@
#include <rdma/ib_sa.h>
#include <rdma/iw_cm.h>
#include "core_priv.h"
MODULE_AUTHOR("Sean Hefty");
MODULE_DESCRIPTION("Generic RDMA CM Agent");
MODULE_LICENSE("Dual BSD/GPL");
@ -185,6 +187,11 @@ enum {
CMA_OPTION_AFONLY,
};
void cma_ref_dev(struct cma_device *cma_dev)
{
atomic_inc(&cma_dev->refcount);
}
/*
* Device removal can occur at anytime, so we need extra handling to
* serialize notifying the user of device removal with other callbacks.
@ -339,7 +346,7 @@ static inline void cma_set_ip_ver(struct cma_hdr *hdr, u8 ip_ver)
static void cma_attach_to_dev(struct rdma_id_private *id_priv,
struct cma_device *cma_dev)
{
atomic_inc(&cma_dev->refcount);
cma_ref_dev(cma_dev);
id_priv->cma_dev = cma_dev;
id_priv->id.device = cma_dev->device;
id_priv->id.route.addr.dev_addr.transport =
@ -347,7 +354,7 @@ static void cma_attach_to_dev(struct rdma_id_private *id_priv,
list_add_tail(&id_priv->list, &cma_dev->id_list);
}
static inline void cma_deref_dev(struct cma_device *cma_dev)
void cma_deref_dev(struct cma_device *cma_dev)
{
if (atomic_dec_and_test(&cma_dev->refcount))
complete(&cma_dev->comp);

4
drivers/infiniband/core/core_priv.h
View file

@ -38,6 +38,10 @@
#include <rdma/ib_verbs.h>
struct cma_device;
void cma_ref_dev(struct cma_device *cma_dev);
void cma_deref_dev(struct cma_device *cma_dev);
int ib_device_register_sysfs(struct ib_device *device,
int (*port_callback)(struct ib_device *,
u8, struct kobject *));