[POWERPC] iSeries: Clean up and simplify vdpinfo.c

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

diff --git a/arch/powerpc/platforms/iseries/vpdinfo.c b/arch/powerpc/platforms/iseries/vpdinfo.c
index f9415bf..aec82e3 100644 (file)
--- a/arch/powerpc/platforms/iseries/vpdinfo.c
+++ b/arch/powerpc/platforms/iseries/vpdinfo.c
@@ -82,62 +82,56 @@ struct slot_map {
 static void __init iseries_parse_slot_area(struct slot_map *map, int len,
                HvAgentId agent, u8 *phb, char card[4])
 {
-       int slot_map_len = len;
-       struct slot_map *slot_map = map;
-
        /*
         * Parse Slot label until we find the one requested
         */
-       while (slot_map_len > 0) {
-               if (slot_map->agent == agent) {
+       while (len > 0) {
+               if (map->agent == agent) {
                        /*
                         * If Phb wasn't found, grab the entry first one found.
                         */
                        if (*phb == 0xff)
-                               *phb = slot_map->phb;
+                               *phb = map->phb;
                        /* Found it, extract the data. */
-                       if (slot_map->phb == *phb) {
-                               memcpy(card, &slot_map->card_location, 3);
+                       if (map->phb == *phb) {
+                               memcpy(card, &map->card_location, 3);
                                card[3]  = 0;
                                break;
                        }
                }
                /* Point to the next Slot */
-               slot_map = (struct slot_map *)((char *)slot_map + SLOT_ENTRY_SIZE);
-               slot_map_len -= SLOT_ENTRY_SIZE;
+               map = (struct slot_map *)((char *)map + SLOT_ENTRY_SIZE);
+               len -= SLOT_ENTRY_SIZE;
        }
 }
 
 /*
  * Parse the Mfg Area
  */
-static void __init iseries_parse_mfg_area(u8 *area, int len,
-               HvAgentId agent, u8 *phb,
-               u8 *frame, char card[4])
+static void __init iseries_parse_mfg_area(struct mfg_vpd_area *area, int len,
+               HvAgentId agent, u8 *phb, u8 *frame, char card[4])
 {
-       struct mfg_vpd_area *mfg_area = (struct mfg_vpd_area *)area;
-       int mfg_area_len = len;
        u16 slot_map_fmt = 0;
 
        /* Parse Mfg Data */
-       while (mfg_area_len > 0) {
-               int mfg_tag_len = mfg_area->length;
+       while (len > 0) {
+               int mfg_tag_len = area->length;
                /* Frame ID         (FI 4649020310 ) */
-               if (mfg_area->tag == VPD_FRU_FRAME_ID)
-                       *frame = mfg_area->data1;
+               if (area->tag == VPD_FRU_FRAME_ID)
+                       *frame = area->data1;
                /* Slot Map Format  (MF 4D46020004 ) */
-               else if (mfg_area->tag == VPD_SLOT_MAP_FORMAT)
-                       slot_map_fmt = (mfg_area->data1 * 256)
-                               + mfg_area->data2;
+               else if (area->tag == VPD_SLOT_MAP_FORMAT)
+                       slot_map_fmt = (area->data1 * 256)
+                               + area->data2;
                /* Slot Map         (SM 534D90 */
-               else if (mfg_area->tag == VPD_SLOT_MAP) {
+               else if (area->tag == VPD_SLOT_MAP) {
                        struct slot_map *slot_map;
 
                        if (slot_map_fmt == 0x1004)
-                               slot_map = (struct slot_map *)((char *)mfg_area
+                               slot_map = (struct slot_map *)((char *)area
                                                + MFG_ENTRY_SIZE + 1);
                        else
-                               slot_map = (struct slot_map *)((char *)mfg_area
+                               slot_map = (struct slot_map *)((char *)area
                                                + MFG_ENTRY_SIZE);
                        iseries_parse_slot_area(slot_map, mfg_tag_len,
                                        agent, phb, card);
@@ -146,9 +140,9 @@ static void __init iseries_parse_mfg_area(u8 *area, int len,
                 * Point to the next Mfg Area
                 * Use defined size, sizeof give wrong answer
                 */
-               mfg_area = (struct mfg_vpd_area *)((char *)mfg_area + mfg_tag_len
+               area = (struct mfg_vpd_area *)((char *)area + mfg_tag_len
                                + MFG_ENTRY_SIZE);
-               mfg_area_len -= (mfg_tag_len + MFG_ENTRY_SIZE);
+               len -= (mfg_tag_len + MFG_ENTRY_SIZE);
        }
 }
 
@@ -156,48 +150,46 @@ static void __init iseries_parse_mfg_area(u8 *area, int len,
  * Look for "BUS".. Data is not Null terminated.
  * PHBID of 0xFF indicates PHB was not found in VPD Data.
  */
-static int __init iseries_parse_phbid(u8 *area, int len)
+static u8 __init iseries_parse_phbid(u8 *area, int len)
 {
-       u8 *phb_ptr = area;
-       int data_len = len;
-       char phb = 0xFF;
-
-       while (data_len > 0) {
-               if ((*phb_ptr == 'B') && (*(phb_ptr + 1) == 'U')
-                               && (*(phb_ptr + 2) == 'S')) {
-                       phb_ptr += 3;
-                       while (*phb_ptr == ' ')
-                               ++phb_ptr;
-                       phb = (*phb_ptr & 0x0F);
-                       break;
+       while (len > 0) {
+               if ((*area == 'B') && (*(area + 1) == 'U')
+                               && (*(area + 2) == 'S')) {
+                       area += 3;
+                       while (*area == ' ')
+                               area++;
+                       return *area & 0x0F;
                }
-               ++phb_ptr;
-               --data_len;
+               area++;
+               len--;
        }
-       return phb;
+       return 0xff;
 }
 
 /*
  * Parse out the VPD Areas
  */
-static void __init iseries_parse_vpd(u8 *data, int vpd_data_len,
+static void __init iseries_parse_vpd(u8 *data, int data_len,
                HvAgentId agent, u8 *frame, char card[4])
 {
-       u8 *tag_ptr = data;
-       int data_len = vpd_data_len - 3;
        u8 phb = 0xff;
 
-       while ((*tag_ptr != VPD_END_OF_AREA) && (data_len > 0)) {
-               int len = *(tag_ptr + 1) + (*(tag_ptr + 2) * 256);
-               u8 *area  = tag_ptr + 3;
+       while (data_len > 0) {
+               int len;
+               u8 tag = *data;
 
-               if (*tag_ptr == VPD_ID_STRING)
-                       phb = iseries_parse_phbid(area, len);
-               else if (*tag_ptr == VPD_VENDOR_AREA)
-                       iseries_parse_mfg_area(area, len,
+               if (tag == VPD_END_OF_AREA)
+                       break;
+               len = *(data + 1) + (*(data + 2) * 256);
+               data += 3;
+               data_len -= 3;
+               if (tag == VPD_ID_STRING)
+                       phb = iseries_parse_phbid(data, len);
+               else if (tag == VPD_VENDOR_AREA)
+                       iseries_parse_mfg_area((struct mfg_vpd_area *)data, len,
                                        agent, &phb, frame, card);
                /* Point to next Area. */
-               tag_ptr  = area + len;
+               data += len;
                data_len -= len;
        }
 }