[PATCH 2/8] drivers edac fix e752x reversed csrows

[dougthompson@xmission.com]

From: Mark Grondona <mgrondona@llnl.gov>

Found a 'reversal' decoding bug in the driver. This patch fixes that
mapping to correctly display the CSROW entries in their proper order.
Users will be enable to correctly identifiy the failing DIMM with
this fix.

CC:             Alan Cox alan@lxorguk.ukuu.org.uk
Signed-off-by: Mark Grondona <mgrondona@llnl.gov>
Signed-off-by:  Doug Thompson <dougthompson@xmission.com>
---
 e752x_edac.c |   34 +++++++++++++++++++++-------------
 1 files changed, 21 insertions(+), 13 deletions(-)

Index: linux-2.6.22-rc4-mm2/drivers/edac/e752x_edac.c
===================================================================
--- linux-2.6.22-rc4-mm2.orig/drivers/edac/e752x_edac.c
+++ linux-2.6.22-rc4-mm2/drivers/edac/e752x_edac.c
@@ -284,9 +284,6 @@ static void do_process_ce(struct mem_ctl
 	/* 0 = channel A, 1 = channel B */
 	channel = !(error_one & 1);
 
-	if (!pvt->map_type)
-		row = 7 - row;
-
 	/* e752x mc reads 34:6 of the DRAM linear address */
 	edac_mc_handle_ce(mci, page, offset_in_page(sec1_add << 4),
 			sec1_syndrome, row, channel, "e752x CE");
@@ -774,6 +771,18 @@ static inline int dual_channel_active(u1
 	return (((ddrcsr >> 12) & 3) == 3);
 }
 
+/* Remap csrow index numbers if map_type is "reverse"
+ */
+static inline int remap_csrow_index(struct mem_ctl_info *mci, int index)
+{
+	struct e752x_pvt *pvt = (struct e752x_pvt *) mci->pvt_info;
+
+	if (!pvt->map_type)
+		return (7 - index);
+
+	return (index);
+}
+
 static void e752x_init_csrows(struct mem_ctl_info *mci, struct pci_dev *pdev,
 			u16 ddrcsr)
 {
@@ -804,7 +813,7 @@ static void e752x_init_csrows(struct mem
 	for (last_cumul_size = index = 0; index < mci->nr_csrows; index++) {
 		/* mem_dev 0=x8, 1=x4 */
 		mem_dev = (dra >> (index * 4 + 2)) & 0x3;
-		csrow = &mci->csrows[index];
+		csrow = &mci->csrows[remap_csrow_index(mci, index)];
 
 		mem_dev = (mem_dev == 2);
 		pci_read_config_byte(pdev, E752X_DRB + index, &value);
@@ -844,7 +853,7 @@ static void e752x_init_mem_map_table(str
 				struct e752x_pvt *pvt)
 {
 	int index;
-	u8 value, last, row, stat8;
+	u8 value, last, row;
 
 	last = 0;
 	row = 0;
@@ -873,10 +882,6 @@ static void e752x_init_mem_map_table(str
 			last = value;
 		}
 	}
-
-	/* set the map type.  1 = normal, 0 = reversed */
-	pci_read_config_byte(pdev, E752X_DRM, &stat8);
-	pvt->map_type = ((stat8 & 0x0f) > ((stat8 >> 4) & 0x0f));
 }
 
 /* Return 0 on success or 1 on failure. */
@@ -1003,13 +1008,16 @@ static int e752x_probe1(struct pci_dev *
 	mci->edac_check = e752x_check;
 	mci->ctl_page_to_phys = ctl_page_to_phys;
 
-	e752x_init_csrows(mci, pdev, ddrcsr);
-	e752x_init_mem_map_table(pdev, pvt);
-
-	/* set the map type.  1 = normal, 0 = reversed */
+	/* set the map type.  1 = normal, 0 = reversed
+	 * Must be set before e752x_init_csrows in case csrow mapping
+	 * is reversed.
+	 */
 	pci_read_config_byte(pdev, E752X_DRM, &stat8);
 	pvt->map_type = ((stat8 & 0x0f) > ((stat8 >> 4) & 0x0f));
 
+	e752x_init_csrows(mci, pdev, ddrcsr);
+	e752x_init_mem_map_table(pdev, pvt);
+
 	mci->edac_cap |= EDAC_FLAG_NONE;
 	debugf3("%s(): tolm, remapbase, remaplimit\n", __func__);
 
-
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