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Subject[PATCH 1/1] edac: i5000_edac critical fix panic out of bounds
From: Tamas Vincze <tom@vincze.org>

Fix for BZ#14568

EDAC MC0: INTERNAL ERROR: channel-b out of range (4 >= 4)
Kernel panic - not syncing: EDAC MC0: Uncorrected Error (XEN) Domain 0 crashed: 'noreboot' set - not rebooting.

This happens because FERR_NF_FBD bit 28 is not updated on i5000. Due to that,
both bits 28 and 29 may be equal to one, returning channel = 3. As this
value is invalid, EDAC core generates the panic.

Signed-off-by: Tamas Vincze <tom@vincze.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: Doug Thompson <dougthompson@xmission.com>
---
i5000_edac.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)

Index: linux-2.6.33-rc4/drivers/edac/i5000_edac.c
===================================================================
--- linux-2.6.33-rc4.orig/drivers/edac/i5000_edac.c 2010-01-14 08:37:33.000000000 -0700
+++ linux-2.6.33-rc4/drivers/edac/i5000_edac.c 2010-01-14 08:41:23.000000000 -0700
@@ -577,7 +577,13 @@ static void i5000_process_nonfatal_error
debugf0("\tUncorrected bits= 0x%x\n", ue_errors);

branch = EXTRACT_FBDCHAN_INDX(info->ferr_nf_fbd);
- channel = branch;
+
+ /*
+ * According with i5000 datasheet, bit 28 has no significance
+ * for errors M4Err-M12Err and M17Err-M21Err, on FERR_NF_FBD
+ */
+ channel = branch & 2;
+
bank = NREC_BANK(info->nrecmema);
rank = NREC_RANK(info->nrecmema);
rdwr = NREC_RDWR(info->nrecmema);

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