From: Yangyang Li liyangyang20@huawei.com
[ Upstream commit 8b436a99cd708bd158231a0630ffa49b1d6175e4 ]
If hns_roce_cmd_use_events() fails then it means that the poll_sem is not obtained, but the poll_sem is released in hns_roce_cmd_use_polling(), this will cause an unlock problem.
This is the static checker warning: drivers/infiniband/hw/hns/hns_roce_main.c:926 hns_roce_init() error: double unlocked '&hr_dev->cmd.poll_sem' (orig line 879)
Event mode and polling mode are mutually exclusive and resources are separated, so there is no need to process polling mode resources in event mode.
The initial mode of cmd is polling mode, so even if cmd fails to switch to event mode, it is not necessary to switch to polling mode.
Fixes: a389d016c030 ("RDMA/hns: Enable all CMDQ context") Fixes: 3d50503b3b33 ("RDMA/hns: Optimize cmd init and mode selection for hip08") Link: https://lore.kernel.org/r/1627887374-20019-1-git-send-email-liangwenpeng@hua... Reported-by: Dan Carpenter dan.carpenter@oracle.com Signed-off-by: Yangyang Li liyangyang20@huawei.com Signed-off-by: Wenpeng Liang liangwenpeng@huawei.com Reviewed-by: Leon Romanovsky leonro@nvidia.com Signed-off-by: Jason Gunthorpe jgg@nvidia.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/infiniband/hw/hns/hns_roce_cmd.c | 7 +++---- drivers/infiniband/hw/hns/hns_roce_main.c | 4 +--- 2 files changed, 4 insertions(+), 7 deletions(-)
diff --git a/drivers/infiniband/hw/hns/hns_roce_cmd.c b/drivers/infiniband/hw/hns/hns_roce_cmd.c index 8f68cc3ff193..84f3f2b5f097 100644 --- a/drivers/infiniband/hw/hns/hns_roce_cmd.c +++ b/drivers/infiniband/hw/hns/hns_roce_cmd.c @@ -213,8 +213,10 @@ int hns_roce_cmd_use_events(struct hns_roce_dev *hr_dev)
hr_cmd->context = kcalloc(hr_cmd->max_cmds, sizeof(*hr_cmd->context), GFP_KERNEL); - if (!hr_cmd->context) + if (!hr_cmd->context) { + hr_dev->cmd_mod = 0; return -ENOMEM; + }
for (i = 0; i < hr_cmd->max_cmds; ++i) { hr_cmd->context[i].token = i; @@ -228,7 +230,6 @@ int hns_roce_cmd_use_events(struct hns_roce_dev *hr_dev) spin_lock_init(&hr_cmd->context_lock);
hr_cmd->use_events = 1; - down(&hr_cmd->poll_sem);
return 0; } @@ -239,8 +240,6 @@ void hns_roce_cmd_use_polling(struct hns_roce_dev *hr_dev)
kfree(hr_cmd->context); hr_cmd->use_events = 0; - - up(&hr_cmd->poll_sem); }
struct hns_roce_cmd_mailbox * diff --git a/drivers/infiniband/hw/hns/hns_roce_main.c b/drivers/infiniband/hw/hns/hns_roce_main.c index 6c6e82b11d8b..33b84f219d0d 100644 --- a/drivers/infiniband/hw/hns/hns_roce_main.c +++ b/drivers/infiniband/hw/hns/hns_roce_main.c @@ -897,11 +897,9 @@ int hns_roce_init(struct hns_roce_dev *hr_dev)
if (hr_dev->cmd_mod) { ret = hns_roce_cmd_use_events(hr_dev); - if (ret) { + if (ret) dev_warn(dev, "Cmd event mode failed, set back to poll!\n"); - hns_roce_cmd_use_polling(hr_dev); - } }
ret = hns_roce_init_hem(hr_dev);