edac: i5000_edac critical fix panic out of bounds

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.

Addresses http://bugzilla.kernel.org/show_bug.cgi?id=14568

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>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/edac/i5000_edac.c b/drivers/edac/i5000_edac.c
index 77a9579d7167..adc10a2ac5f6 100644
--- a/drivers/edac/i5000_edac.c
+++ b/drivers/edac/i5000_edac.c
@@ -577,7 +577,13 @@ static void i5000_process_nonfatal_error_info(struct mem_ctl_info *mci,
                 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);