e1000: Fix driver to be used on PA RISC C8000 workstations

The checksum field in the EEPROM on HPPA is really not a
checksum but a signature (0x16d6).  So allow 0x16d6 as the
matching checksum on HPPA systems.

This issue is present on longterm/stable kernels, I have
verified that this patch is applicable back to at least
2.6.32.y kernels.

v2- changed ifdef to use CONFIG_PARISC instead of __hppa__

CC: Guy Martin <gmsoft@tuxicoman.be>
CC: Rolf Eike Beer <eike-kernel@sf-tec.de>
CC: Matt Turner <mattst88@gmail.com>
Reported-by: Mikulas Patocka <mikulas@artax.kerlin.mff.cuni.cz>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Acked-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/e1000/e1000_hw.c b/drivers/net/e1000/e1000_hw.c
index 8545c7aa93eb674639b6d68dff2e77cb9a7e7d75..a5a89ecb6f3654c730d834a99f090248a6053b21 100644 (file)
--- a/drivers/net/e1000/e1000_hw.c
+++ b/drivers/net/e1000/e1000_hw.c
@@ -4026,6 +4026,12 @@ s32 e1000_validate_eeprom_checksum(struct e1000_hw *hw)
                checksum += eeprom_data;
        }
 
+#ifdef CONFIG_PARISC
+       /* This is a signature and not a checksum on HP c8000 */
+       if ((hw->subsystem_vendor_id == 0x103C) && (eeprom_data == 0x16d6))
+               return E1000_SUCCESS;
+
+#endif
        if (checksum == (u16) EEPROM_SUM)
                return E1000_SUCCESS;
        else {