qlcnic: protect qlicnic_attach_func with rtnl_lock

qlcnic_attach_func requires rtnl_lock to be held.

Cc: Dept-GELinuxNICDev@qlogic.com
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c

@@ -3952,8 +3952,14 @@ static pci_ers_result_t qlcnic_82xx_io_error_detected(struct pci_dev *pdev,
 
 static pci_ers_result_t qlcnic_82xx_io_slot_reset(struct pci_dev *pdev)
 {
-	return qlcnic_attach_func(pdev) ? PCI_ERS_RESULT_DISCONNECT :
+	pci_ers_result_t res;
+
+	rtnl_lock();
+	res = qlcnic_attach_func(pdev) ? PCI_ERS_RESULT_DISCONNECT :
 					 PCI_ERS_RESULT_RECOVERED;
+	rtnl_unlock();
+
+	return res;
 }
 
 static void qlcnic_82xx_io_resume(struct pci_dev *pdev)