[PATCH] infiniband: hw: hns: Fix a sleep-in-atomic-context bug in hns_roce_set_hem()

[Jia-Ju Bai]

The driver may sleep with holding a spinlock.

The function call paths (from bottom to top) in Linux-4.16 are:

drivers/infiniband/hw/hns/hns_roce_hem.c, 345: 
        msleep in hns_roce_set_hem
drivers/infiniband/hw/hns/hns_roce_hem.c, 330: 
        _raw_spin_lock_irqsave in hns_roce_set_hem

To fix this bug, msleep() is replaced with mdelay().

This bug is found by my static analysis tool DSAC.

Signed-off-by: Jia-Ju Bai <baijiaju1...@gmail.com>
---
 drivers/infiniband/hw/hns/hns_roce_hem.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/infiniband/hw/hns/hns_roce_hem.c 
b/drivers/infiniband/hw/hns/hns_roce_hem.c
index 63b5b3edabcb..8c142676c589 100644
--- a/drivers/infiniband/hw/hns/hns_roce_hem.c
+++ b/drivers/infiniband/hw/hns/hns_roce_hem.c
@@ -342,7 +342,7 @@ static int hns_roce_set_hem(struct hns_roce_dev *hr_dev,
                        } else {
                                break;
                        }
-                       msleep(HW_SYNC_SLEEP_TIME_INTERVAL);
+                       mdelay(HW_SYNC_SLEEP_TIME_INTERVAL);
                }
 
                bt_cmd_l = (u32)bt_ba;
-- 
2.17.0