[net] 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.

CC: Guy Martin <redacted>
CC: Rolf Eike Beer <redacted>
CC: Matt Turner <mattst88@gmail.com>
Reported-by: Mikulas Patocka <redacted>
Signed-off-by: Jeff Kirsher <redacted>
Acked-by: Jesse Brandeburg <redacted>
---
 drivers/net/e1000/e1000_hw.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/drivers/net/e1000/e1000_hw.c b/drivers/net/e1000/e1000_hw.c
index 8545c7a..08c1ad5 100644
--- 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 __hppa__
+	/* 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 {

-- 
1.7.6

From: Jeff Kirsher <redacted>
Date: Tue, 30 Aug 2011 17:19:26 -0700

+#ifdef __hppa__

Please use CONFIG_PARISC

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On Tue, 2011-08-30 at 17:39 -0700, David Miller wrote:

From: Jeff Kirsher <redacted>
Date: Tue, 30 Aug 2011 17:19:26 -0700

quoted

+#ifdef __hppa__

Please use CONFIG_PARISC

Ok, I will put together a v2 of the patch with your suggested change.

On Tue, Aug 30, 2011 at 05:19:26PM -0700, Jeff Kirsher wrote:

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.

CC: Guy Martin <redacted>
CC: Rolf Eike Beer <redacted>
CC: Matt Turner <mattst88@gmail.com>
Reported-by: Mikulas Patocka <redacted>
Signed-off-by: Jeff Kirsher <redacted>
Acked-by: Jesse Brandeburg <redacted>

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read Documentation/stable_kernel_rules.txt
for how to do this properly.

</formletter>