[PATCH AUTOSEL 4.9 166/251] RDMA/hns: Fixs hw access invalid dma memory error

Sasha Levin
2020-01-16T18:03:45Z

From: Xi Wang <wangxi11@huawei.com>

[ Upstream commit ec5bc2cc69b4fc494e04d10fc5226f6f9cf67c56 ]

When smmu is enable, if execute the perftest command and then use 'kill
-9' to exit, follow this operation repeatedly, the kernel will have a high
probability to print the following smmu event:

arm-smmu-v3 arm-smmu-v3.1.auto: event 0x10 received:
arm-smmu-v3 arm-smmu-v3.1.auto: 0x00007d0000000010
arm-smmu-v3 arm-smmu-v3.1.auto: 0x0000020900000080
arm-smmu-v3 arm-smmu-v3.1.auto: 0x00000000f47cf000
arm-smmu-v3 arm-smmu-v3.1.auto: 0x00000000f47cf000

This is because the hw will periodically refresh the qpc cache until the
next reset.

This patch fixed it by removing the action that release qpc memory in the
'hns_roce_qp_free' function.

Fixes: 9a4435375cd1 ("IB/hns: Add driver files for hns RoCE driver")
Signed-off-by: Xi Wang <wangxi11@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/infiniband/hw/hns/hns_roce_qp.c | 1 -
1 file changed, 1 deletion(-)

diff --git a/drivers/infiniband/hw/hns/hns_roce_qp.c b/drivers/infiniband/hw/hns/hns_roce_qp.c
index 33cf1035030b..6f3c0ea99dd0 100644
--- a/drivers/infiniband/hw/hns/hns_roce_qp.c
+++ b/drivers/infiniband/hw/hns/hns_roce_qp.c
@@ -241,7 +241,6 @@ void hns_roce_qp_free(struct hns_roce_dev *hr_dev, struct hns_roce_qp *hr_qp)

if ((hr_qp->ibqp.qp_type) != IB_QPT_GSI) {
hns_roce_table_put(hr_dev, &qp_table->irrl_table, hr_qp->qpn);
- hns_roce_table_put(hr_dev, &qp_table->qp_table, hr_qp->qpn);
}
}

--
2.20.1