netdev - [PATCH] netxen: Fix a sleep-in-atomic bug in netxen_nic_pci_mem_access

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Message-Id: <1496222469-4648-1-git-send-email-baijiaju1990@163.com>
Date:   Wed, 31 May 2017 17:21:09 +0800
From:   Jia-Ju Bai <baijiaju1990@....com>
To:     manish.chopra@...ium.com, rahul.verma@...ium.com,
        Dept-GELinuxNICDev@...ium.com
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_pci_mem_access_direct

The driver may sleep under a spin lock, and the function call path is:
netxen_nic_pci_mem_access_direct (acquire the lock by spin_lock)
  ioremap --> may sleep

To fix it, the lock is released before "ioremap", and the lock is 
acquired again after this function.

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

diff --git a/drivers/net/ethernet/qlogic/netxen/netxen_nic_hw.c b/drivers/net/ethernet/qlogic/netxen/netxen_nic_hw.c
index a996801..5ea553e 100644
--- a/drivers/net/ethernet/qlogic/netxen/netxen_nic_hw.c
+++ b/drivers/net/ethernet/qlogic/netxen/netxen_nic_hw.c
@@ -1419,7 +1419,9 @@ static u32 netxen_nic_io_read_2M(struct netxen_adapter *adapter,
 
 		mem_base = pci_resource_start(adapter->pdev, 0) +
 					(start & PAGE_MASK);
+		spin_unlock(&adapter->ahw.mem_lock);
 		mem_ptr = ioremap(mem_base, PAGE_SIZE);
+		spin_lock(&adapter->ahw.mem_lock);
 		if (mem_ptr == NULL) {
 			ret = -EIO;
 			goto unlock;
-- 
1.7.9.5