edac: i5100 ack error detection register after each read

If I only ack the detection register after a error have been detected
I'm unable to reliably detect errors. I have verified this behavior
using both an error injection DIMM and software to inject errors.

I can't find any documentation supporting this behavior in Intel 5100
Memory Controller Hub Chipset, see 1. So this is all based on
experimentation.

[1] Intel® 5100 Memory Controller Hub Chipset
    http://www.intel.com/content/dam/doc/datasheet/5100-
	memory-controller-hub-chipset-datasheet.pdf

Signed-off-by: Niklas Söderlund <niklas.soderlund@ericsson.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 4 insertions, 7 deletions

diff --git a/drivers/edac/i5100_edac.c b/drivers/edac/i5100_edac.c
index ab2f90619821..2a6e7ff1f020 100644
--- a/drivers/edac/i5100_edac.c
+++ b/drivers/edac/i5100_edac.c
@@ -535,23 +535,20 @@ static void i5100_read_log(struct mem_ctl_info *mci, int chan,
 static void i5100_check_error(struct mem_ctl_info *mci)
 {
         struct i5100_priv *priv = mci->pvt_info;
-        u32 dw;
-
+        u32 dw, dw2;
 
         pci_read_config_dword(priv->mc, I5100_FERR_NF_MEM, &dw);
         if (i5100_ferr_nf_mem_any(dw)) {
-                u32 dw2;
 
                 pci_read_config_dword(priv->mc, I5100_NERR_NF_MEM, &dw2);
-                if (dw2)
-                        pci_write_config_dword(priv->mc, I5100_NERR_NF_MEM,
-                                               dw2);
-                pci_write_config_dword(priv->mc, I5100_FERR_NF_MEM, dw);
 
                 i5100_read_log(mci, i5100_ferr_nf_mem_chan_indx(dw),
                                i5100_ferr_nf_mem_any(dw),
                                i5100_nerr_nf_mem_any(dw2));
+
+                pci_write_config_dword(priv->mc, I5100_NERR_NF_MEM, dw2);
         }
+        pci_write_config_dword(priv->mc, I5100_FERR_NF_MEM, dw);
 }
 
 /* The i5100 chipset will scrub the entire memory once, then