linux-kernel - Re: [PATCH 08/13] IB/srpt: chain RDMA READ/WRITE requests

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Date:	Tue, 29 Dec 2015 10:58:24 +0100
From:	Bart Van Assche <bart.vanassche@...disk.com>
To:	Christoph Hellwig <hch@....de>, <linux-rdma@...r.kernel.org>
CC:	<sagig@....mellanox.co.il>, <bart.vanassche@...disk.com>,
	<axboe@...com>, <linux-scsi@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 08/13] IB/srpt: chain RDMA READ/WRITE requests

On 12/07/2015 09:51 PM, Christoph Hellwig wrote:
> Remove struct rdma_iu and instead allocate the struct ib_rdma_wr array
> early and fill out directly.  This allows us to chain the WRs, and thus
> archive both less lock contention on the HCA workqueue as well as much
> simpler error handling.

Please consider folding the patch below into this patch.

Thanks,

Bart.

[PATCH] IB/srpt: Fix a recently introduced kernel crash

BUG: unable to handle kernel paging request at 0000000100000198
IP: [<ffffffff810a4ea2>] __lock_acquire+0xa2/0x560
Call Trace:
 [<ffffffff810a53c2>] lock_acquire+0x62/0x80
 [<ffffffff8151bd33>] _raw_spin_lock_irqsave+0x43/0x60
 [<ffffffffa04fd437>] srpt_rdma_read_done+0x57/0x120 [ib_srpt]
 [<ffffffffa0144dd3>] __ib_process_cq+0x43/0xc0 [ib_core]
 [<ffffffffa0145115>] ib_cq_poll_work+0x25/0x70 [ib_core]
 [<ffffffff8107184d>] process_one_work+0x1bd/0x460
 [<ffffffff81073148>] worker_thread+0x118/0x420
 [<ffffffff81078454>] kthread+0xe4/0x100
 [<ffffffff8151cbbf>] ret_from_fork+0x3f/0x70

---
 drivers/infiniband/ulp/srpt/ib_srpt.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/ulp/srpt/ib_srpt.c b/drivers/infiniband/ulp/srpt/ib_srpt.c
index 8068aff..3daab39 100644
--- a/drivers/infiniband/ulp/srpt/ib_srpt.c
+++ b/drivers/infiniband/ulp/srpt/ib_srpt.c
@@ -1395,7 +1395,7 @@ static void srpt_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc)
 {
 	struct srpt_rdma_ch *ch = cq->cq_context;
 	struct srpt_send_ioctx *ioctx =
-		container_of(wc->wr_cqe, struct srpt_send_ioctx, ioctx.cqe);
+		container_of(wc->wr_cqe, struct srpt_send_ioctx, rdma_cqe);
 
 	WARN_ON(ioctx->n_rdma <= 0);
 	atomic_add(ioctx->n_rdma, &ch->sq_wr_avail);
@@ -1418,7 +1418,7 @@ static void srpt_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc)
 static void srpt_rdma_write_done(struct ib_cq *cq, struct ib_wc *wc)
 {
 	struct srpt_send_ioctx *ioctx =
-		container_of(wc->wr_cqe, struct srpt_send_ioctx, ioctx.cqe);
+		container_of(wc->wr_cqe, struct srpt_send_ioctx, rdma_cqe);
 
 	if (unlikely(wc->status != IB_WC_SUCCESS)) {
 		pr_info("RDMA_WRITE for ioctx 0x%p failed with status %d\n",
-- 
2.1.4


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