Unverified Commit ab293c3a authored by openeuler-ci-bot's avatar openeuler-ci-bot Committed by Gitee
Browse files

!13301 RDMA/bnxt_re: Avoid CPU lockups due fifo occupancy check loop 

Merge Pull Request from: @ci-robot 
 
PR sync from: Zhang Changzhong <zhangchangzhong@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/V5QY7MIW3MSE4NJ2JKIPKPDF6FOZB6AV/ 
 
https://gitee.com/src-openeuler/kernel/issues/IB2SU7 
 
Link:https://gitee.com/openeuler/kernel/pulls/13301

 

Reviewed-by: default avatarYue Haibing <yuehaibing@huawei.com>
Signed-off-by: default avatarZhang Peng <zhangpeng362@huawei.com>
parents b265682b 0ab9f4c3

drivers/infiniband/hw/bnxt_re/main.c

+10 −0
Original line number Diff line number Diff line
@@ -484,6 +484,8 @@ static void bnxt_re_set_default_pacing_data(struct bnxt_re_dev *rdev) 


static void __wait_for_fifo_occupancy_below_th(struct bnxt_re_dev *rdev)

{

	struct bnxt_qplib_db_pacing_data *pacing_data = rdev->qplib_res.pacing_data;

	u32 retry_fifo_check = 1000;

	u32 read_val, fifo_occup;



	/* loop shouldn't run infintely as the occupancy usually goes
@@ -500,6 +502,14 @@ static void __wait_for_fifo_occupancy_below_th(struct bnxt_re_dev *rdev) 


		if (fifo_occup < rdev->qplib_res.pacing_data->pacing_th)

			break;

		if (!retry_fifo_check--) {

			dev_info_once(rdev_to_dev(rdev),

				      "%s: fifo_occup = 0x%xfifo_max_depth = 0x%x pacing_th = 0x%x\n",

				      __func__, fifo_occup, pacing_data->fifo_max_depth,

					pacing_data->pacing_th);

			break;

		}



	}

}