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IB/qib: Fix QP RCU sparse warnings

Browse source 
Commit af061a644a ("IB/qib: Use RCU for qpn lookup") introduced sparse
warnings.

This patch corrects those issues.

Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
This commit is contained in:
Mike Marciniszyn 2012-07-16 17:11:06 +00:00 committed by Roland Dreier
parent 7e23017704
commit 1fb9fed6d4
5 changed files with 61 additions and 35 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

12
drivers/infiniband/hw/qib/qib_iba7322.c
View file

@ -1,5 +1,6 @@
/*
* Copyright (c) 2008, 2009, 2010 QLogic Corporation. All rights reserved.
* Copyright (c) 2012 Intel Corporation. All rights reserved.
* Copyright (c) 2008 - 2012 QLogic Corporation. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
@ -49,6 +50,7 @@
#include "qib_qsfp.h"
#include "qib_mad.h"
#include "qib_verbs.h"
static void qib_setup_7322_setextled(struct qib_pportdata *, u32);
static void qib_7322_handle_hwerrors(struct qib_devdata *, char *, size_t);
@ -5151,15 +5153,11 @@ static void try_7322_ipg(struct qib_pportdata *ppd)
goto retry;
if (!ibp->smi_ah) {
struct ib_ah_attr attr;
struct ib_ah *ah;
memset(&attr, 0, sizeof attr);
attr.dlid = be16_to_cpu(IB_LID_PERMISSIVE);
attr.port_num = ppd->port;
ah = ib_create_ah(ibp->qp0->ibqp.pd, &attr);
ah = qib_create_qp0_ah(ibp, be16_to_cpu(IB_LID_PERMISSIVE));
if (IS_ERR(ah))
ret = -EINVAL;
ret = PTR_ERR(ah);
else {
send_buf->ah = ah;
ibp->smi_ah = to_iah(ah);

12
drivers/infiniband/hw/qib/qib_mad.c
View file

@ -1,6 +1,6 @@
/*
* Copyright (c) 2006, 2007, 2008, 2009, 2010 QLogic Corporation.
* All rights reserved.
* Copyright (c) 2012 Intel Corporation. All rights reserved.
* Copyright (c) 2006 - 2012 QLogic Corporation. All rights reserved.
* Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.
*
* This software is available to you under a choice of one of two
@ -90,14 +90,10 @@ static void qib_send_trap(struct qib_ibport *ibp, void *data, unsigned len)
if (!ibp->sm_ah) {
if (ibp->sm_lid != be16_to_cpu(IB_LID_PERMISSIVE)) {
struct ib_ah *ah;
struct ib_ah_attr attr;
memset(&attr, 0, sizeof attr);
attr.dlid = ibp->sm_lid;
attr.port_num = ppd_from_ibp(ibp)->port;
ah = ib_create_ah(ibp->qp0->ibqp.pd, &attr);
ah = qib_create_qp0_ah(ibp, ibp->sm_lid);
if (IS_ERR(ah))
ret = -EINVAL;
ret = PTR_ERR(ah);
else {
send_buf->ah = ah;
ibp->sm_ah = to_iah(ah);

35
drivers/infiniband/hw/qib/qib_qp.c
View file

@ -1,6 +1,6 @@
/*
* Copyright (c) 2006, 2007, 2008, 2009, 2010 QLogic Corporation.
* All rights reserved.
* Copyright (c) 2012 Intel Corporation. All rights reserved.
* Copyright (c) 2006 - 2012 QLogic Corporation. * All rights reserved.
* Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.
*
* This software is available to you under a choice of one of two
@ -250,23 +250,33 @@ static void remove_qp(struct qib_ibdev *dev, struct qib_qp *qp)
spin_lock_irqsave(&dev->qpt_lock, flags);
if (ibp->qp0 == qp) {
if (rcu_dereference_protected(ibp->qp0,
lockdep_is_held(&dev->qpt_lock)) == qp) {
atomic_dec(&qp->refcount);
rcu_assign_pointer(ibp->qp0, NULL);
} else if (ibp->qp1 == qp) {
} else if (rcu_dereference_protected(ibp->qp1,
lockdep_is_held(&dev->qpt_lock)) == qp) {
atomic_dec(&qp->refcount);
rcu_assign_pointer(ibp->qp1, NULL);
} else {
struct qib_qp *q, **qpp;
struct qib_qp *q;
struct qib_qp __rcu **qpp;
qpp = &dev->qp_table[n];
for (; (q = *qpp) != NULL; qpp = &q->next)
q = rcu_dereference_protected(*qpp,
lockdep_is_held(&dev->qpt_lock));
for (; q; qpp = &q->next) {
if (q == qp) {
atomic_dec(&qp->refcount);
rcu_assign_pointer(*qpp, qp->next);
qp->next = NULL;
*qpp = qp->next;
rcu_assign_pointer(qp->next, NULL);
q = rcu_dereference_protected(*qpp,
lockdep_is_held(&dev->qpt_lock));
break;
}
q = rcu_dereference_protected(*qpp,
lockdep_is_held(&dev->qpt_lock));
}
}
spin_unlock_irqrestore(&dev->qpt_lock, flags);
@ -302,10 +312,12 @@ unsigned qib_free_all_qps(struct qib_devdata *dd)
spin_lock_irqsave(&dev->qpt_lock, flags);
for (n = 0; n < dev->qp_table_size; n++) {
qp = dev->qp_table[n];
qp = rcu_dereference_protected(dev->qp_table[n],
lockdep_is_held(&dev->qpt_lock));
rcu_assign_pointer(dev->qp_table[n], NULL);
for (; qp; qp = qp->next)
for (; qp; qp = rcu_dereference_protected(qp->next,
lockdep_is_held(&dev->qpt_lock)))
qp_inuse++;
}
spin_unlock_irqrestore(&dev->qpt_lock, flags);
@ -337,7 +349,8 @@ struct qib_qp *qib_lookup_qpn(struct qib_ibport *ibp, u32 qpn)
unsigned n = qpn_hash(dev, qpn);
rcu_read_lock();
for (qp = dev->qp_table[n]; rcu_dereference(qp); qp = qp->next)
for (qp = rcu_dereference(dev->qp_table[n]); qp;
qp = rcu_dereference(qp->next))
if (qp->ibqp.qp_num == qpn)
break;
}

23
drivers/infiniband/hw/qib/qib_verbs.c
View file

@ -1,6 +1,6 @@
/*
* Copyright (c) 2006, 2007, 2008, 2009, 2010 QLogic Corporation.
* All rights reserved.
* Copyright (c) 2012 Intel Corporation. All rights reserved.
* Copyright (c) 2006 - 2012 QLogic Corporation. All rights reserved.
* Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.
*
* This software is available to you under a choice of one of two
@ -1845,6 +1845,23 @@ static struct ib_ah *qib_create_ah(struct ib_pd *pd,
return ret;
}
struct ib_ah *qib_create_qp0_ah(struct qib_ibport *ibp, u16 dlid)
{
struct ib_ah_attr attr;
struct ib_ah *ah = ERR_PTR(-EINVAL);
struct qib_qp *qp0;
memset(&attr, 0, sizeof attr);
attr.dlid = dlid;
attr.port_num = ppd_from_ibp(ibp)->port;
rcu_read_lock();
qp0 = rcu_dereference(ibp->qp0);
if (qp0)
ah = ib_create_ah(qp0->ibqp.pd, &attr);
rcu_read_unlock();
return ah;
}
/**
* qib_destroy_ah - destroy an address handle
* @ibah: the AH to destroy
@ -2060,7 +2077,7 @@ int qib_register_ib_device(struct qib_devdata *dd)
spin_lock_init(&dev->lk_table.lock);
dev->lk_table.max = 1 << ib_qib_lkey_table_size;
lk_tab_size = dev->lk_table.max * sizeof(*dev->lk_table.table);
dev->lk_table.table = (struct qib_mregion **)
dev->lk_table.table = (struct qib_mregion __rcu **)
__get_free_pages(GFP_KERNEL, get_order(lk_tab_size));
if (dev->lk_table.table == NULL) {
ret = -ENOMEM;

14
drivers/infiniband/hw/qib/qib_verbs.h
View file

@ -1,6 +1,6 @@
/*
* Copyright (c) 2006, 2007, 2008, 2009, 2010 QLogic Corporation.
* All rights reserved.
* Copyright (c) 2012 Intel Corporation. All rights reserved.
* Copyright (c) 2006 - 2012 QLogic Corporation. All rights reserved.
* Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.
*
* This software is available to you under a choice of one of two
@ -420,7 +420,7 @@ struct qib_qp {
/* read mostly fields above and below */
struct ib_ah_attr remote_ah_attr;
struct ib_ah_attr alt_ah_attr;
struct qib_qp *next; /* link list for QPN hash table */
struct qib_qp __rcu *next; /* link list for QPN hash table */
struct qib_swqe *s_wq; /* send work queue */
struct qib_mmap_info *ip;
struct qib_ib_header *s_hdr; /* next packet header to send */
@ -659,8 +659,8 @@ struct qib_opcode_stats {
};
struct qib_ibport {
struct qib_qp *qp0;
struct qib_qp *qp1;
struct qib_qp __rcu *qp0;
struct qib_qp __rcu *qp1;
struct ib_mad_agent *send_agent; /* agent for SMI (traps) */
struct qib_ah *sm_ah;
struct qib_ah *smi_ah;
@ -743,7 +743,7 @@ struct qib_ibdev {
struct list_head memwait; /* list for wait kernel memory */
struct list_head txreq_free;
struct timer_list mem_timer;
struct qib_qp **qp_table;
struct qib_qp __rcu **qp_table;
struct qib_pio_header *pio_hdrs;
dma_addr_t pio_hdrs_phys;
/* list of QPs waiting for RNR timer */
@ -937,6 +937,8 @@ void qib_rc_rcv(struct qib_ctxtdata *rcd, struct qib_ib_header *hdr,
int qib_check_ah(struct ib_device *ibdev, struct ib_ah_attr *ah_attr);
struct ib_ah *qib_create_qp0_ah(struct qib_ibport *ibp, u16 dlid);
void qib_rc_rnr_retry(unsigned long arg);
void qib_rc_send_complete(struct qib_qp *qp, struct qib_ib_header *hdr);