[PATCH for-next 4/4] RDMA/erdma: Support create_ah/destroy_ah in non-sleepable contexts

[Boshi Yu <boshiyu@linux.alibaba.com>]

The RDMA CM module might invoke erdma_create_ah() or erdma_destroy_ah()
in a non-sleepable context. Both of these functions will call the
erdma_post_cmd_wait(), which can potentially sleep and occasionally lead
to a hard lockup. Therefore, post the create_ah and destroy_ah commands in
polling mode if the RDMA_CREATE_AH_SLEEPABLE and RDMA_DESTROY_AH_SLEEPABLE
flags are not set, respectively.

Reviewed-by: Cheng Xu <chengyou@linux.alibaba.com>
Signed-off-by: Boshi Yu <boshiyu@linux.alibaba.com>
---
 drivers/infiniband/hw/erdma/erdma_verbs.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/hw/erdma/erdma_verbs.c b/drivers/infiniband/hw/erdma/erdma_verbs.c
index 73ec59dcf43e..3511189a4248 100644
--- a/drivers/infiniband/hw/erdma/erdma_verbs.c
+++ b/drivers/infiniband/hw/erdma/erdma_verbs.c
@@ -2223,7 +2223,7 @@ int erdma_create_ah(struct ib_ah *ibah, struct rdma_ah_init_attr *init_attr,
 	erdma_set_av_cfg(&req.av_cfg, &ah->av);
 
 	ret = erdma_post_cmd_wait(&dev->cmdq, &req, sizeof(req), NULL, NULL,
-				  true);
+				  init_attr->flags & RDMA_CREATE_AH_SLEEPABLE);
 	if (ret) {
 		erdma_free_idx(&dev->res_cb[ERDMA_RES_TYPE_AH], ah->ahn);
 		return ret;
@@ -2247,7 +2247,7 @@ int erdma_destroy_ah(struct ib_ah *ibah, u32 flags)
 	req.ahn = ah->ahn;
 
 	ret = erdma_post_cmd_wait(&dev->cmdq, &req, sizeof(req), NULL, NULL,
-				  true);
+				  flags & RDMA_DESTROY_AH_SLEEPABLE);
 	if (ret)
 		return ret;
 
-- 
2.46.0