linux-kernel - [PATCH] netxen: Fix a sleep-in-atomic bug in netxen_nic_hw_read_wx_2M and netxen_nic_hw_write_wx

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Date:   Mon, 19 Jun 2017 10:47:32 +0800
From:   Jia-Ju Bai <baijiaju1990@....com>
To:     rahul.verma@...ium.com, davem@...emloft.net
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jia-Ju Bai <baijiaju1990@....com>
Subject: [PATCH] netxen: Fix a sleep-in-atomic bug in netxen_nic_hw_read_wx_2M and netxen_nic_hw_write_wx_2M

The driver may sleep under a write spin lock, and function call path is:
netxen_nic_hw_read_wx_2M (acquire the lock by write_lock_irqsave)
  crb_win_lock
    netxen_pcie_sem_lock
      msleep --> may sleep
netxen_nic_hw_write_wx_2M (acquire the lock by write_lock_irqsave)
  crb_win_lock
    netxen_pcie_sem_lock
      msleep --> may sleep

To fix it, the "msleep" is replaced with "mdelay" in netxen_pcie_sem_lock.

Signed-off-by: Jia-Ju Bai <baijiaju1990@....com>
---
 drivers/net/ethernet/qlogic/netxen/netxen_nic_hw.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/qlogic/netxen/netxen_nic_hw.c b/drivers/net/ethernet/qlogic/netxen/netxen_nic_hw.c
index a996801..0a9da42 100644
--- a/drivers/net/ethernet/qlogic/netxen/netxen_nic_hw.c
+++ b/drivers/net/ethernet/qlogic/netxen/netxen_nic_hw.c
@@ -329,7 +329,7 @@ static void __iomem *pci_base_offset(struct netxen_adapter *adapter,
 			break;
 		if (++timeout >= NETXEN_PCIE_SEM_TIMEOUT)
 			return -EIO;
-		msleep(1);
+		mdelay(1);
 	}
 
 	if (id_reg)
-- 
1.7.9.5