forked from Minki/linux
2aee309d3e
A failure in the get_txreq() inline will result in a slow path retry using __get_txreq(). __get_txreq() attempts to procure the qp s_lock, which is already held in all callers. Fix by deleting the s_lock maintenance in __get_txreq() and add sparse syntax hooks to future proof the code. Cc: Stable <stable@vger.kernel.org> # 4.6+ Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com> Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com> Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
118 lines
3.8 KiB
C
118 lines
3.8 KiB
C
/*
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* Copyright(c) 2016 Intel Corporation.
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*
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* This file is provided under a dual BSD/GPLv2 license. When using or
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* redistributing this file, you may do so under either license.
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*
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* GPL LICENSE SUMMARY
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* BSD LICENSE
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* - Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifndef HFI1_VERBS_TXREQ_H
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#define HFI1_VERBS_TXREQ_H
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#include <linux/types.h>
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#include <linux/slab.h>
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#include "verbs.h"
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#include "sdma_txreq.h"
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#include "iowait.h"
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struct verbs_txreq {
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struct hfi1_pio_header phdr;
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struct sdma_txreq txreq;
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struct rvt_qp *qp;
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struct rvt_swqe *wqe;
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struct rvt_mregion *mr;
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struct rvt_sge_state *ss;
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struct sdma_engine *sde;
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struct send_context *psc;
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u16 hdr_dwords;
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};
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struct hfi1_ibdev;
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struct verbs_txreq *__get_txreq(struct hfi1_ibdev *dev,
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struct rvt_qp *qp);
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static inline struct verbs_txreq *get_txreq(struct hfi1_ibdev *dev,
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struct rvt_qp *qp)
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__must_hold(&qp->slock)
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{
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struct verbs_txreq *tx;
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struct hfi1_qp_priv *priv = qp->priv;
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tx = kmem_cache_alloc(dev->verbs_txreq_cache, GFP_ATOMIC);
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if (unlikely(!tx)) {
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/* call slow path to get the lock */
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tx = __get_txreq(dev, qp);
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if (IS_ERR(tx))
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return tx;
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}
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tx->qp = qp;
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tx->mr = NULL;
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tx->sde = priv->s_sde;
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tx->psc = priv->s_sendcontext;
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/* so that we can test if the sdma decriptors are there */
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tx->txreq.num_desc = 0;
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return tx;
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}
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static inline struct sdma_txreq *get_sdma_txreq(struct verbs_txreq *tx)
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{
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return &tx->txreq;
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}
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static inline struct verbs_txreq *get_waiting_verbs_txreq(struct rvt_qp *qp)
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{
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struct sdma_txreq *stx;
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struct hfi1_qp_priv *priv = qp->priv;
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stx = iowait_get_txhead(&priv->s_iowait);
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if (stx)
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return container_of(stx, struct verbs_txreq, txreq);
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return NULL;
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}
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void hfi1_put_txreq(struct verbs_txreq *tx);
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int verbs_txreq_init(struct hfi1_ibdev *dev);
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void verbs_txreq_exit(struct hfi1_ibdev *dev);
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#endif /* HFI1_VERBS_TXREQ_H */
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