linux-kernel - [PATCH 4.9 017/104] igb: re-assign hw address pointer on reset after PCI error

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Message-Id: <20171006083843.326675872@linuxfoundation.org>
Date:   Fri,  6 Oct 2017 10:50:55 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Anthony H Thai <ahthai@...ibm.com>,
        Harsha Thyagaraja <hathyaga@...ibm.com>,
        Guilherme G Piccoli <gpiccoli@...ux.vnet.ibm.com>,
        Aaron Brown <aaron.f.brown@...el.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.9 017/104] igb: re-assign hw address pointer on reset after PCI error

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Guilherme G Piccoli <gpiccoli@...ux.vnet.ibm.com>

[ Upstream commit 69b97cf6dbce7403845a28bbc75d57f5be7b12ac ]

Whenever the igb driver detects the result of a read operation returns
a value composed only by F's (like 0xFFFFFFFF), it will detach the
net_device, clear the hw_addr pointer and warn to the user that adapter's
link is lost - those steps happen on igb_rd32().

In case a PCI error happens on Power architecture, there's a recovery
mechanism called EEH, that will reset the PCI slot and call driver's
handlers to reset the adapter and network functionality as well.

We observed that once hw_addr is NULL after the error is detected on
igb_rd32(), it's never assigned back, so in the process of resetting
the network functionality we got a NULL pointer dereference in both
igb_configure_tx_ring() and igb_configure_rx_ring(). In order to avoid
such bug, this patch re-assigns the hw_addr value in the slot_reset
handler.

Reported-by: Anthony H Thai <ahthai@...ibm.com>
Reported-by: Harsha Thyagaraja <hathyaga@...ibm.com>
Signed-off-by: Guilherme G Piccoli <gpiccoli@...ux.vnet.ibm.com>
Tested-by: Aaron Brown <aaron.f.brown@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/intel/igb/igb_main.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -7882,6 +7882,11 @@ static pci_ers_result_t igb_io_slot_rese
 		pci_enable_wake(pdev, PCI_D3hot, 0);
 		pci_enable_wake(pdev, PCI_D3cold, 0);

+		/* In case of PCI error, adapter lose its HW address
+		 * so we should re-assign it here.
+		 */
+		hw->hw_addr = adapter->io_addr;
+
 		igb_reset(adapter);
 		wr32(E1000_WUS, ~0);
 		result = PCI_ERS_RESULT_RECOVERED;