linux-kernel - [PATCH for-next 04/10] RDMA/hns: Fix deadlock on SRQ async events.

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Message-ID: <20240412091616.370789-5-huangjunxian6@hisilicon.com>
Date: Fri, 12 Apr 2024 17:16:10 +0800
From: Junxian Huang <huangjunxian6@...ilicon.com>
To: <jgg@...pe.ca>, <leon@...nel.org>
CC: <linux-rdma@...r.kernel.org>, <linuxarm@...wei.com>,
	<linux-kernel@...r.kernel.org>, <huangjunxian6@...ilicon.com>
Subject: [PATCH for-next 04/10] RDMA/hns: Fix deadlock on SRQ async events.

From: Chengchang Tang <tangchengchang@...wei.com>

xa_lock for SRQ table may be required in AEQ. Use xa_store_irq()/
xa_erase_irq() to avoid deadlock.

Fixes: 81fce6291d99 ("RDMA/hns: Add SRQ asynchronous event support")
Signed-off-by: Chengchang Tang <tangchengchang@...wei.com>
Signed-off-by: Junxian Huang <huangjunxian6@...ilicon.com>
---
 drivers/infiniband/hw/hns/hns_roce_main.c | 1 +
 drivers/infiniband/hw/hns/hns_roce_srq.c  | 6 +++---
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/infiniband/hw/hns/hns_roce_main.c b/drivers/infiniband/hw/hns/hns_roce_main.c
index 4d94fcb8685a..d202258368ed 100644
--- a/drivers/infiniband/hw/hns/hns_roce_main.c
+++ b/drivers/infiniband/hw/hns/hns_roce_main.c
@@ -37,6 +37,7 @@
 #include <rdma/ib_smi.h>
 #include <rdma/ib_user_verbs.h>
 #include <rdma/ib_cache.h>
+#include "hnae3.h"
 #include "hns_roce_common.h"
 #include "hns_roce_device.h"
 #include "hns_roce_hem.h"
diff --git a/drivers/infiniband/hw/hns/hns_roce_srq.c b/drivers/infiniband/hw/hns/hns_roce_srq.c
index e4705ccdfa65..7210e53a82f3 100644
--- a/drivers/infiniband/hw/hns/hns_roce_srq.c
+++ b/drivers/infiniband/hw/hns/hns_roce_srq.c
@@ -123,7 +123,7 @@ static int alloc_srqc(struct hns_roce_dev *hr_dev, struct hns_roce_srq *srq)
 		return ret;
 	}
 
-	ret = xa_err(xa_store(&srq_table->xa, srq->srqn, srq, GFP_KERNEL));
+	ret = xa_err(xa_store_irq(&srq_table->xa, srq->srqn, srq, GFP_KERNEL));
 	if (ret) {
 		ibdev_err(ibdev, "failed to store SRQC, ret = %d.\n", ret);
 		goto err_put;
@@ -136,7 +136,7 @@ static int alloc_srqc(struct hns_roce_dev *hr_dev, struct hns_roce_srq *srq)
 	return 0;
 
 err_xa:
-	xa_erase(&srq_table->xa, srq->srqn);
+	xa_erase_irq(&srq_table->xa, srq->srqn);
 err_put:
 	hns_roce_table_put(hr_dev, &srq_table->table, srq->srqn);
 
@@ -154,7 +154,7 @@ static void free_srqc(struct hns_roce_dev *hr_dev, struct hns_roce_srq *srq)
 		dev_err(hr_dev->dev, "DESTROY_SRQ failed (%d) for SRQN %06lx\n",
 			ret, srq->srqn);
 
-	xa_erase(&srq_table->xa, srq->srqn);
+	xa_erase_irq(&srq_table->xa, srq->srqn);
 
 	if (refcount_dec_and_test(&srq->refcount))
 		complete(&srq->free);
-- 
2.30.0