i7300_edac: Fix error cleanup logic

The error cleanup logic was broken. Due to that, one error is generated for
every error polling.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/edac/i7300_edac.c b/drivers/edac/i7300_edac.c
index a76fe83..6104dba 100644 (file)
--- a/drivers/edac/i7300_edac.c
+++ b/drivers/edac/i7300_edac.c
@@ -372,7 +372,7 @@ static const char *get_err_from_table(const char *table[], int size, int pos)
 static void i7300_process_error_global(struct mem_ctl_info *mci)
 {
        struct i7300_pvt *pvt;
-       u32 errnum, value;
+       u32 errnum, error_reg;
        unsigned long errors;
        const char *specific;
        bool is_fatal;
@@ -381,9 +381,9 @@ static void i7300_process_error_global(struct mem_ctl_info *mci)
 
        /* read in the 1st FATAL error register */
        pci_read_config_dword(pvt->pci_dev_16_2_fsb_err_regs,
-                             FERR_GLOBAL_HI, &value);
-       if (unlikely(value)) {
-               errors = value;
+                             FERR_GLOBAL_HI, &error_reg);
+       if (unlikely(error_reg)) {
+               errors = error_reg;
                errnum = find_first_bit(&errors,
                                        ARRAY_SIZE(ferr_global_hi_name));
                specific = GET_ERR_FROM_TABLE(ferr_global_hi_name, errnum);
@@ -391,15 +391,15 @@ static void i7300_process_error_global(struct mem_ctl_info *mci)
 
                /* Clear the error bit */
                pci_write_config_dword(pvt->pci_dev_16_2_fsb_err_regs,
-                                      FERR_GLOBAL_HI, value);
+                                      FERR_GLOBAL_HI, error_reg);
 
                goto error_global;
        }
 
        pci_read_config_dword(pvt->pci_dev_16_2_fsb_err_regs,
-                             FERR_GLOBAL_LO, &value);
-       if (unlikely(value)) {
-               errors = value;
+                             FERR_GLOBAL_LO, &error_reg);
+       if (unlikely(error_reg)) {
+               errors = error_reg;
                errnum = find_first_bit(&errors,
                                        ARRAY_SIZE(ferr_global_lo_name));
                specific = GET_ERR_FROM_TABLE(ferr_global_lo_name, errnum);
@@ -407,7 +407,7 @@ static void i7300_process_error_global(struct mem_ctl_info *mci)
 
                /* Clear the error bit */
                pci_write_config_dword(pvt->pci_dev_16_2_fsb_err_regs,
-                                      FERR_GLOBAL_LO, value);
+                                      FERR_GLOBAL_LO, error_reg);
 
                goto error_global;
        }
@@ -427,7 +427,7 @@ error_global:
 static void i7300_process_fbd_error(struct mem_ctl_info *mci)
 {
        struct i7300_pvt *pvt;
-       u32 errnum, value;
+       u32 errnum, value, error_reg;
        u16 val16;
        unsigned branch, channel, bank, rank, cas, ras;
        u32 syndrome;
@@ -440,14 +440,14 @@ static void i7300_process_fbd_error(struct mem_ctl_info *mci)
 
        /* read in the 1st FATAL error register */
        pci_read_config_dword(pvt->pci_dev_16_1_fsb_addr_map,
-                             FERR_FAT_FBD, &value);
-       if (unlikely(value & FERR_FAT_FBD_ERR_MASK)) {
-               errors = value & FERR_FAT_FBD_ERR_MASK ;
+                             FERR_FAT_FBD, &error_reg);
+       if (unlikely(error_reg & FERR_FAT_FBD_ERR_MASK)) {
+               errors = error_reg & FERR_FAT_FBD_ERR_MASK ;
                errnum = find_first_bit(&errors,
                                        ARRAY_SIZE(ferr_fat_fbd_name));
                specific = GET_ERR_FROM_TABLE(ferr_fat_fbd_name, errnum);
+               branch = (GET_FBD_FAT_IDX(error_reg) == 2) ? 1 : 0;
 
-               branch = (GET_FBD_FAT_IDX(value) == 2) ? 1 : 0;
                pci_read_config_word(pvt->pci_dev_16_1_fsb_addr_map,
                                     NRECMEMA, &val16);
                bank = NRECMEMA_BANK(val16);
@@ -455,11 +455,14 @@ static void i7300_process_fbd_error(struct mem_ctl_info *mci)
 
                pci_read_config_dword(pvt->pci_dev_16_1_fsb_addr_map,
                                NRECMEMB, &value);
-
                is_wr = NRECMEMB_IS_WR(value);
                cas = NRECMEMB_CAS(value);
                ras = NRECMEMB_RAS(value);
 
+               /* Clean the error register */
+               pci_write_config_dword(pvt->pci_dev_16_1_fsb_addr_map,
+                               FERR_FAT_FBD, error_reg);
+
                snprintf(pvt->tmp_prt_buffer, PAGE_SIZE,
                        "FATAL (Branch=%d DRAM-Bank=%d %s "
                        "RAS=%d CAS=%d Err=0x%lx (%s))",
@@ -476,21 +479,17 @@ static void i7300_process_fbd_error(struct mem_ctl_info *mci)
 
        /* read in the 1st NON-FATAL error register */
        pci_read_config_dword(pvt->pci_dev_16_1_fsb_addr_map,
-                             FERR_NF_FBD, &value);
-       if (unlikely(value & FERR_NF_FBD_ERR_MASK)) {
-               errors = value & FERR_NF_FBD_ERR_MASK;
+                             FERR_NF_FBD, &error_reg);
+       if (unlikely(error_reg & FERR_NF_FBD_ERR_MASK)) {
+               errors = error_reg & FERR_NF_FBD_ERR_MASK;
                errnum = find_first_bit(&errors,
                                        ARRAY_SIZE(ferr_nf_fbd_name));
                specific = GET_ERR_FROM_TABLE(ferr_nf_fbd_name, errnum);
-
-               /* Clear the error bit */
-               pci_write_config_dword(pvt->pci_dev_16_2_fsb_err_regs,
-                                      FERR_GLOBAL_LO, value);
+               branch = (GET_FBD_FAT_IDX(error_reg) == 2) ? 1 : 0;
 
                pci_read_config_dword(pvt->pci_dev_16_1_fsb_addr_map,
                        REDMEMA, &syndrome);
 
-               branch = (GET_FBD_FAT_IDX(value) == 2) ? 1 : 0;
                pci_read_config_word(pvt->pci_dev_16_1_fsb_addr_map,
                                     RECMEMA, &val16);
                bank = RECMEMA_BANK(val16);
@@ -498,18 +497,20 @@ static void i7300_process_fbd_error(struct mem_ctl_info *mci)
 
                pci_read_config_dword(pvt->pci_dev_16_1_fsb_addr_map,
                                RECMEMB, &value);
-
                is_wr = RECMEMB_IS_WR(value);
                cas = RECMEMB_CAS(value);
                ras = RECMEMB_RAS(value);
 
                pci_read_config_dword(pvt->pci_dev_16_1_fsb_addr_map,
                                     REDMEMB, &value);
-
                channel = (branch << 1);
                if (IS_SECOND_CH(value))
                        channel++;
 
+               /* Clear the error bit */
+               pci_write_config_dword(pvt->pci_dev_16_1_fsb_addr_map,
+                               FERR_NF_FBD, error_reg);
+
                /* Form out message */
                snprintf(pvt->tmp_prt_buffer, PAGE_SIZE,
                        "Corrected error (Branch=%d, Channel %d), "