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tg3: Initialize REG_BASE_ADDR at PCI config offset 120 to 0

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[ Upstream commit 388d333557 ]

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>
This commit is contained in:
Nat Gurumoorthy
2013-12-09 10:43:21 -08:00
committed by Greg Kroah-Hartman
parent d90d9ff6ca
commit fa57cd8a52
1 changed files with 3 additions and 0 deletions
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3
drivers/net/ethernet/broadcom/tg3.c
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@@ -16297,6 +16297,9 @@ static int tg3_get_invariants(struct tg3 *tp, const struct pci_device_id *ent)
/* Clear this out for sanity. */
tw32(TG3PCI_MEM_WIN_BASE_ADDR, 0);
/* Clear TG3PCI_REG_BASE_ADDR to prevent hangs. */
tw32(TG3PCI_REG_BASE_ADDR, 0);
pci_read_config_dword(tp->pdev, TG3PCI_PCISTATE,
&pci_state_reg);
if ((pci_state_reg & PCISTATE_CONV_PCI_MODE) == 0 &&