[PATCH AUTOSEL for 4.4 115/167] qlcnic: Fix a sleep-in-atomic bug in qlcnic_82xx_hw_write_wx_2M and qlcnic_82xx_hw_read_wx_2M

Sasha Levin
2018-03-19T17:13:57Z

From: Jia-Ju Bai <baijiaju1990@163.com>

[ Upstream commit 5ea6d691aac6c93b790f0905e3460d44cc4c449b ]

The driver may sleep under a write spin lock, and the function
call path is:
qlcnic_82xx_hw_write_wx_2M (acquire the lock by write_lock_irqsave)
crb_win_lock
qlcnic_pcie_sem_lock
usleep_range
qlcnic_82xx_hw_read_wx_2M (acquire the lock by write_lock_irqsave)
crb_win_lock
qlcnic_pcie_sem_lock
usleep_range

To fix it, the usleep_range is replaced with udelay.

Signed-off-by: Jia-Ju Bai <baijiaju1990@163.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
drivers/net/ethernet/qlogic/qlcnic/qlcnic_hw.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_hw.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_hw.c
index 509b596cf1e8..bd1ec70fb736 100644
--- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_hw.c
+++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_hw.c
@@ -341,7 +341,7 @@ qlcnic_pcie_sem_lock(struct qlcnic_adapter *adapter, int sem, u32 id_reg)
}
return -EIO;
}
- usleep_range(1000, 1500);
+ udelay(1200);
}

if (id_reg)
--
2.14.1