edac i5000, i5400: fix pointer math in i5000_get_mc_regs()

"pvt->ambase" is a u64 datatype.  The intent here is to fill the first
half in the first call to pci_read_config_dword() and the other half in
the second.  Unfortunately the pointer math is wrong so we set the wrong
data.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

2 files changed, 18 insertions, 6 deletions

diff --git a/drivers/edac/i5000_edac.c b/drivers/edac/i5000_edac.c
index a5c33df520ac..39c63757c2a1 100644
--- a/drivers/edac/i5000_edac.c
+++ b/drivers/edac/i5000_edac.c
@@ -328,7 +328,13 @@ struct i5000_pvt {
         struct pci_dev *branch_1;       /* 22.0 */
 
         u16 tolm;               /* top of low memory */
-        u64 ambase;             /* AMB BAR */
+        union {
+                u64 ambase;             /* AMB BAR */
+                struct {
+                        u32 ambase_bottom;
+                        u32 ambase_top;
+                } u __packed;
+        };
 
         u16 mir0, mir1, mir2;
 
@@ -1131,9 +1137,9 @@ static void i5000_get_mc_regs(struct mem_ctl_info *mci)
         pvt = mci->pvt_info;
 
         pci_read_config_dword(pvt->system_address, AMBASE,
-                        (u32 *) & pvt->ambase);
+                        &pvt->u.ambase_bottom);
         pci_read_config_dword(pvt->system_address, AMBASE + sizeof(u32),
-                        ((u32 *) & pvt->ambase) + sizeof(u32));
+                        &pvt->u.ambase_top);
 
         maxdimmperch = pvt->maxdimmperch;
         maxch = pvt->maxch;
diff --git a/drivers/edac/i5400_edac.c b/drivers/edac/i5400_edac.c
index 50069c62c8d4..277246998b80 100644
--- a/drivers/edac/i5400_edac.c
+++ b/drivers/edac/i5400_edac.c
@@ -327,7 +327,13 @@ struct i5400_pvt {
         struct pci_dev *branch_1;               /* 22.0 */
 
         u16 tolm;                               /* top of low memory */
-        u64 ambase;                             /* AMB BAR */
+        union {
+                u64 ambase;                             /* AMB BAR */
+                struct {
+                        u32 ambase_bottom;
+                        u32 ambase_top;
+                } u __packed;
+        };
 
         u16 mir0, mir1;
 
@@ -1055,9 +1061,9 @@ static void i5400_get_mc_regs(struct mem_ctl_info *mci)
         pvt = mci->pvt_info;
 
         pci_read_config_dword(pvt->system_address, AMBASE,
-                        (u32 *) &pvt->ambase);
+                        &pvt->u.ambase_bottom);
         pci_read_config_dword(pvt->system_address, AMBASE + sizeof(u32),
-                        ((u32 *) &pvt->ambase) + sizeof(u32));
+                        &pvt->u.ambase_top);
 
         maxdimmperch = pvt->maxdimmperch;
         maxch = pvt->maxch;