path: root/drivers/net
diff options
authorNat Gurumoorthy <natg@google.com>2013-12-09 10:43:21 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-01-15 15:28:47 -0800
commitfa57cd8a526cb76ae372f0963339883f8e9f69bb (patch)
treed660be6d6b5983e871bf235d6670b184b8af80eb /drivers/net
parentd90d9ff6cac64e701f27291ecef12fdc48606bb6 (diff)
tg3: Initialize REG_BASE_ADDR at PCI config offset 120 to 0
[ Upstream commit 388d3335575f4c056dcf7138a30f1454e2145cd8 ] The new tg3 driver leaves REG_BASE_ADDR (PCI config offset 120) uninitialized. From power on reset this register may have garbage in it. The Register Base Address register defines the device local address of a register. The data pointed to by this location is read or written using the Register Data register (PCI config offset 128). When REG_BASE_ADDR has garbage any read or write of Register Data Register (PCI 128) will cause the PCI bus to lock up. The TCO watchdog will fire and bring down the system. Signed-off-by: Nat Gurumoorthy <natg@google.com> Acked-by: Michael Chan <mchan@broadcom.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/net')
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
index 36a0b438e65..11ae0811e4b 100644
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -16297,6 +16297,9 @@ static int tg3_get_invariants(struct tg3 *tp, const struct pci_device_id *ent)
/* Clear this out for sanity. */
+ /* Clear TG3PCI_REG_BASE_ADDR to prevent hangs. */
+ tw32(TG3PCI_REG_BASE_ADDR, 0);
pci_read_config_dword(tp->pdev, TG3PCI_PCISTATE,
if ((pci_state_reg & PCISTATE_CONV_PCI_MODE) == 0 &&