[PATCH 4.4 028/163] x86 EDAC, sb_edac.c: Repair damage introduced when "fixing" channel address

Greg Kroah-Hartman
2016-05-03T01:48:37Z

From: Tony Luck <tony.luck@intel.com>

commit ff15e95c82768d589957dbb17d7eb7dba7904659 upstream.

In commit:

eb1af3b71f9d ("Fix computation of channel address")

I switched the "sck_way" variable from holding the log2 value read
from the h/w to instead be the actual number. Unfortunately it
is needed in log2 form when used to shift the address.

Tested-by: Patrick Geary <patrickg@supermicro.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Acked-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Cc: Aristeu Rozanski <arozansk@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-edac@vger.kernel.org
Fixes: eb1af3b71f9d ("Fix computation of channel address")
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/edac/sb_edac.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

--- a/drivers/edac/sb_edac.c
+++ b/drivers/edac/sb_edac.c
@@ -1396,7 +1396,7 @@ static int get_memory_error_data(struct
}

ch_way = TAD_CH(reg) + 1;
- sck_way = 1 << TAD_SOCK(reg);
+ sck_way = TAD_SOCK(reg);

if (ch_way == 3)
idx = addr >> 6;
@@ -1435,7 +1435,7 @@ static int get_memory_error_data(struct
switch(ch_way) {
case 2:
case 4:
- sck_xch = 1 << sck_way * (ch_way >> 1);
+ sck_xch = (1 << sck_way) * (ch_way >> 1);
break;
default:
sprintf(msg, "Invalid mirror set. Can't decode addr");
@@ -1471,7 +1471,7 @@ static int get_memory_error_data(struct

ch_addr = addr - offset;
ch_addr >>= (6 + shiftup);
- ch_addr /= ch_way * sck_way;
+ ch_addr /= sck_xch;
ch_addr <<= (6 + shiftup);
ch_addr |= addr & ((1 << (6 + shiftup)) - 1);