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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>
This commit is contained in:
Tamas Vincze 2010-01-15 17:01:10 -08:00 committed by Linus Torvalds
parent 355e8e8d1b
commit 118f3e1afd
1 changed files with 7 additions and 1 deletions
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8
drivers/edac/i5000_edac.c
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@ -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);