--- /dev/null
+From b522d7b0ebe3539340c2a6d46d787ae3d33bcb92 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
+Date: Tue, 10 Jan 2017 23:15:24 +0100
+Subject: [PATCH] mtd: bcm47xxpart: move TRX parsing code to separated function
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+This change simplifies main parsing loop logic a bit. In future it may
+be useful for moving TRX support to separated module / parser (if we
+implement support for them at some point).
+Finally parsing TRX at the end puts us in a better position as we have
+better flash layout knowledge. It may be useful e.g. if it appears there
+is more than 1 TRX partition.
+
+Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
+Acked-by: Marek Vasut <marek.vasut@gmail.com>
+Signed-off-by: Brian Norris <computersforpeace@gmail.com>
+---
+ drivers/mtd/bcm47xxpart.c | 121 ++++++++++++++++++++++++++++------------------
+ 1 file changed, 74 insertions(+), 47 deletions(-)
+
+--- a/drivers/mtd/bcm47xxpart.c
++++ b/drivers/mtd/bcm47xxpart.c
+@@ -83,6 +83,67 @@ out_default:
+ return "rootfs";
+ }
+
++static int bcm47xxpart_parse_trx(struct mtd_info *master,
++ struct mtd_partition *trx,
++ struct mtd_partition *parts,
++ size_t parts_len)
++{
++ struct trx_header header;
++ size_t bytes_read;
++ int curr_part = 0;
++ int i, err;
++
++ if (parts_len < 3) {
++ pr_warn("No enough space to add TRX partitions!\n");
++ return -ENOMEM;
++ }
++
++ err = mtd_read(master, trx->offset, sizeof(header), &bytes_read,
++ (uint8_t *)&header);
++ if (err && !mtd_is_bitflip(err)) {
++ pr_err("mtd_read error while reading TRX header: %d\n", err);
++ return err;
++ }
++
++ i = 0;
++
++ /* We have LZMA loader if offset[2] points to sth */
++ if (header.offset[2]) {
++ bcm47xxpart_add_part(&parts[curr_part++], "loader",
++ trx->offset + header.offset[i], 0);
++ i++;
++ }
++
++ if (header.offset[i]) {
++ bcm47xxpart_add_part(&parts[curr_part++], "linux",
++ trx->offset + header.offset[i], 0);
++ i++;
++ }
++
++ if (header.offset[i]) {
++ size_t offset = trx->offset + header.offset[i];
++ const char *name = bcm47xxpart_trx_data_part_name(master,
++ offset);
++
++ bcm47xxpart_add_part(&parts[curr_part++], name, offset, 0);
++ i++;
++ }
++
++ /*
++ * Assume that every partition ends at the beginning of the one it is
++ * followed by.
++ */
++ for (i = 0; i < curr_part; i++) {
++ u64 next_part_offset = (i < curr_part - 1) ?
++ parts[i + 1].offset :
++ trx->offset + trx->size;
++
++ parts[i].size = next_part_offset - parts[i].offset;
++ }
++
++ return curr_part;
++}
++
+ static int bcm47xxpart_parse(struct mtd_info *master,
+ const struct mtd_partition **pparts,
+ struct mtd_part_parser_data *data)
+@@ -93,9 +154,7 @@ static int bcm47xxpart_parse(struct mtd_
+ size_t bytes_read;
+ uint32_t offset;
+ uint32_t blocksize = master->erasesize;
+- struct trx_header *trx;
+ int trx_part = -1;
+- int last_trx_part = -1;
+ int possible_nvram_sizes[] = { 0x8000, 0xF000, 0x10000, };
+ int err;
+
+@@ -182,54 +241,14 @@ static int bcm47xxpart_parse(struct mtd_
+
+ /* TRX */
+ if (buf[0x000 / 4] == TRX_MAGIC) {
+- if (BCM47XXPART_MAX_PARTS - curr_part < 4) {
+- pr_warn("Not enough partitions left to register trx, scanning stopped!\n");
+- break;
+- }
+-
+- trx = (struct trx_header *)buf;
++ struct trx_header *trx;
+
+ trx_part = curr_part;
+ bcm47xxpart_add_part(&parts[curr_part++], "firmware",
+ offset, 0);
+
+- i = 0;
+- /* We have LZMA loader if offset[2] points to sth */
+- if (trx->offset[2]) {
+- bcm47xxpart_add_part(&parts[curr_part++],
+- "loader",
+- offset + trx->offset[i],
+- 0);
+- i++;
+- }
+-
+- if (trx->offset[i]) {
+- bcm47xxpart_add_part(&parts[curr_part++],
+- "linux",
+- offset + trx->offset[i],
+- 0);
+- i++;
+- }
+-
+- /*
+- * Pure rootfs size is known and can be calculated as:
+- * trx->length - trx->offset[i]. We don't fill it as
+- * we want to have jffs2 (overlay) in the same mtd.
+- */
+- if (trx->offset[i]) {
+- const char *name;
+-
+- name = bcm47xxpart_trx_data_part_name(master, offset + trx->offset[i]);
+- bcm47xxpart_add_part(&parts[curr_part++],
+- name,
+- offset + trx->offset[i],
+- 0);
+- i++;
+- }
+-
+- last_trx_part = curr_part - 1;
+-
+ /* Jump to the end of TRX */
++ trx = (struct trx_header *)buf;
+ offset = roundup(offset + trx->length, blocksize);
+ /* Next loop iteration will increase the offset */
+ offset -= blocksize;
+@@ -307,9 +326,17 @@ static int bcm47xxpart_parse(struct mtd_
+ parts[i + 1].offset : master->size;
+
+ parts[i].size = next_part_offset - parts[i].offset;
+- if (i == last_trx_part && trx_part >= 0)
+- parts[trx_part].size = next_part_offset -
+- parts[trx_part].offset;
++ }
++
++ /* If there was TRX parse it now */
++ if (trx_part >= 0) {
++ int num_parts;
++
++ num_parts = bcm47xxpart_parse_trx(master, &parts[trx_part],
++ parts + curr_part,
++ BCM47XXPART_MAX_PARTS - curr_part);
++ if (num_parts > 0)
++ curr_part += num_parts;
+ }
+
+ *pparts = parts;
projects / openwrt / openwrt.git / blobdiff