linux-kernel - [025/107] e1000: Fix driver to be used on PA RISC C8000 workstations

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Date:	Wed, 02 Nov 2011 15:13:51 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Guy Martin <gmsoft@...icoman.be>,
	Rolf Eike Beer <eike-kernel@...tec.de>,
	Matt Turner <mattst88@...il.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [025/107] e1000: Fix driver to be used on PA RISC C8000 workstations

2.6.32-longterm review patch.  If anyone has any objections, please let us know.

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

From: Jeff Kirsher <jeffrey.t.kirsher@...el.com>

commit e2faeec2de9e2c73958e6ea6065dde1e8cd6f3a2 upstream.

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@...icoman.be>
CC: Rolf Eike Beer <eike-kernel@...tec.de>
CC: Matt Turner <mattst88@...il.com>
Reported-by: Mikulas Patocka <mikulas@...ax.kerlin.mff.cuni.cz>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Acked-by: Jesse Brandeburg <jesse.brandeburg@...el.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/net/e1000/e1000_hw.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/net/e1000/e1000_hw.c
+++ b/drivers/net/e1000/e1000_hw.c
@@ -3842,6 +3842,12 @@ s32 e1000_validate_eeprom_checksum(struc
 		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 {

--
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