locking/atomic, kref: Add kref_read()
Since we need to change the implementation, stop exposing internals.
Provide kref_read() to read the current reference count; typically
used for debug messages.
Kills two anti-patterns:
atomic_read(&kref->refcount)
kref->refcount.counter
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
diff --git a/drivers/infiniband/hw/cxgb3/iwch_cm.h b/drivers/infiniband/hw/cxgb3/iwch_cm.h
index b9efadf..e66e759 100644
--- a/drivers/infiniband/hw/cxgb3/iwch_cm.h
+++ b/drivers/infiniband/hw/cxgb3/iwch_cm.h
@@ -55,14 +55,14 @@
#define put_ep(ep) { \
PDBG("put_ep (via %s:%u) ep %p refcnt %d\n", __func__, __LINE__, \
- ep, atomic_read(&((ep)->kref.refcount))); \
- WARN_ON(atomic_read(&((ep)->kref.refcount)) < 1); \
+ ep, kref_read(&((ep)->kref))); \
+ WARN_ON(kref_read(&((ep)->kref)) < 1); \
kref_put(&((ep)->kref), __free_ep); \
}
#define get_ep(ep) { \
PDBG("get_ep (via %s:%u) ep %p, refcnt %d\n", __func__, __LINE__, \
- ep, atomic_read(&((ep)->kref.refcount))); \
+ ep, kref_read(&((ep)->kref))); \
kref_get(&((ep)->kref)); \
}
diff --git a/drivers/infiniband/hw/cxgb3/iwch_qp.c b/drivers/infiniband/hw/cxgb3/iwch_qp.c
index d939980..a9194db 100644
--- a/drivers/infiniband/hw/cxgb3/iwch_qp.c
+++ b/drivers/infiniband/hw/cxgb3/iwch_qp.c
@@ -961,7 +961,7 @@ int iwch_modify_qp(struct iwch_dev *rhp, struct iwch_qp *qhp,
case IWCH_QP_STATE_RTS:
switch (attrs->next_state) {
case IWCH_QP_STATE_CLOSING:
- BUG_ON(atomic_read(&qhp->ep->com.kref.refcount) < 2);
+ BUG_ON(kref_read(&qhp->ep->com.kref) < 2);
qhp->attr.state = IWCH_QP_STATE_CLOSING;
if (!internal) {
abort=0;
diff --git a/drivers/infiniband/hw/cxgb4/iw_cxgb4.h b/drivers/infiniband/hw/cxgb4/iw_cxgb4.h
index 4788e1a..4dc1415 100644
--- a/drivers/infiniband/hw/cxgb4/iw_cxgb4.h
+++ b/drivers/infiniband/hw/cxgb4/iw_cxgb4.h
@@ -654,14 +654,14 @@ enum c4iw_mmid_state {
#define c4iw_put_ep(ep) { \
PDBG("put_ep (via %s:%u) ep %p refcnt %d\n", __func__, __LINE__, \
- ep, atomic_read(&((ep)->kref.refcount))); \
- WARN_ON(atomic_read(&((ep)->kref.refcount)) < 1); \
+ ep, kref_read(&((ep)->kref))); \
+ WARN_ON(kref_read(&((ep)->kref)) < 1); \
kref_put(&((ep)->kref), _c4iw_free_ep); \
}
#define c4iw_get_ep(ep) { \
PDBG("get_ep (via %s:%u) ep %p, refcnt %d\n", __func__, __LINE__, \
- ep, atomic_read(&((ep)->kref.refcount))); \
+ ep, kref_read(&((ep)->kref))); \
kref_get(&((ep)->kref)); \
}
void _c4iw_free_ep(struct kref *kref);
diff --git a/drivers/infiniband/hw/cxgb4/qp.c b/drivers/infiniband/hw/cxgb4/qp.c
index cda5542..347b3c9 100644
--- a/drivers/infiniband/hw/cxgb4/qp.c
+++ b/drivers/infiniband/hw/cxgb4/qp.c
@@ -1503,7 +1503,7 @@ int c4iw_modify_qp(struct c4iw_dev *rhp, struct c4iw_qp *qhp,
case C4IW_QP_STATE_RTS:
switch (attrs->next_state) {
case C4IW_QP_STATE_CLOSING:
- BUG_ON(atomic_read(&qhp->ep->com.kref.refcount) < 2);
+ BUG_ON(kref_read(&qhp->ep->com.kref) < 2);
t4_set_wq_in_error(&qhp->wq);
set_state(qhp, C4IW_QP_STATE_CLOSING);
ep = qhp->ep;
diff --git a/drivers/infiniband/hw/usnic/usnic_ib_sysfs.c b/drivers/infiniband/hw/usnic/usnic_ib_sysfs.c
index 80ef3f8..0444324 100644
--- a/drivers/infiniband/hw/usnic/usnic_ib_sysfs.c
+++ b/drivers/infiniband/hw/usnic/usnic_ib_sysfs.c
@@ -80,7 +80,7 @@ usnic_ib_show_config(struct device *device, struct device_attribute *attr,
left = PAGE_SIZE;
mutex_lock(&us_ibdev->usdev_lock);
- if (atomic_read(&us_ibdev->vf_cnt.refcount) > 0) {
+ if (kref_read(&us_ibdev->vf_cnt) > 0) {
char *busname;
/*
@@ -99,7 +99,7 @@ usnic_ib_show_config(struct device *device, struct device_attribute *attr,
PCI_FUNC(us_ibdev->pdev->devfn),
netdev_name(us_ibdev->netdev),
us_ibdev->ufdev->mac,
- atomic_read(&us_ibdev->vf_cnt.refcount));
+ kref_read(&us_ibdev->vf_cnt));
UPDATE_PTR_LEFT(n, ptr, left);
for (res_type = USNIC_VNIC_RES_TYPE_EOL;
@@ -147,7 +147,7 @@ usnic_ib_show_max_vf(struct device *device, struct device_attribute *attr,
us_ibdev = container_of(device, struct usnic_ib_dev, ib_dev.dev);
return scnprintf(buf, PAGE_SIZE, "%u\n",
- atomic_read(&us_ibdev->vf_cnt.refcount));
+ kref_read(&us_ibdev->vf_cnt));
}
static ssize_t
diff --git a/drivers/infiniband/hw/usnic/usnic_ib_verbs.c b/drivers/infiniband/hw/usnic/usnic_ib_verbs.c
index 74819a7..69df8e3 100644
--- a/drivers/infiniband/hw/usnic/usnic_ib_verbs.c
+++ b/drivers/infiniband/hw/usnic/usnic_ib_verbs.c
@@ -291,11 +291,11 @@ int usnic_ib_query_device(struct ib_device *ibdev,
qp_per_vf = max(us_ibdev->vf_res_cnt[USNIC_VNIC_RES_TYPE_WQ],
us_ibdev->vf_res_cnt[USNIC_VNIC_RES_TYPE_RQ]);
props->max_qp = qp_per_vf *
- atomic_read(&us_ibdev->vf_cnt.refcount);
+ kref_read(&us_ibdev->vf_cnt);
props->device_cap_flags = IB_DEVICE_PORT_ACTIVE_EVENT |
IB_DEVICE_SYS_IMAGE_GUID | IB_DEVICE_BLOCK_MULTICAST_LOOPBACK;
props->max_cq = us_ibdev->vf_res_cnt[USNIC_VNIC_RES_TYPE_CQ] *
- atomic_read(&us_ibdev->vf_cnt.refcount);
+ kref_read(&us_ibdev->vf_cnt);
props->max_pd = USNIC_UIOM_MAX_PD_CNT;
props->max_mr = USNIC_UIOM_MAX_MR_CNT;
props->local_ca_ack_delay = 0;