diff options
| -rw-r--r-- | drivers/mtd/devices/docg3.c | 21 |
1 files changed, 13 insertions, 8 deletions
diff --git a/drivers/mtd/devices/docg3.c b/drivers/mtd/devices/docg3.c index 3eafef383a39..2c1d0fca6757 100644 --- a/drivers/mtd/devices/docg3.c +++ b/drivers/mtd/devices/docg3.c @@ -734,7 +734,7 @@ err: * doc_read_page_getbytes - Reads bytes from a prepared page * @docg3: the device * @len: the number of bytes to be read (must be a multiple of 4) - * @buf: the buffer to be filled in + * @buf: the buffer to be filled in (or NULL is forget bytes) * @first: 1 if first time read, DOC_READADDRESS should be set * */ @@ -849,7 +849,7 @@ static int doc_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops) { struct docg3 *docg3 = mtd->priv; - int block0, block1, page, ret, ofs = 0; + int block0, block1, page, ret, skip, ofs = 0; u8 *oobbuf = ops->oobbuf; u8 *buf = ops->datbuf; size_t len, ooblen, nbdata, nboob; @@ -869,8 +869,7 @@ static int doc_read_oob(struct mtd_info *mtd, loff_t from, doc_dbg("doc_read_oob(from=%lld, mode=%d, data=(%p:%zu), oob=(%p:%zu))\n", from, ops->mode, buf, len, oobbuf, ooblen); - if ((len % DOC_LAYOUT_PAGE_SIZE) || (ooblen % DOC_LAYOUT_OOB_SIZE) || - (from % DOC_LAYOUT_PAGE_SIZE)) + if (ooblen % DOC_LAYOUT_OOB_SIZE) return -EINVAL; ret = -EINVAL; @@ -882,10 +881,11 @@ static int doc_read_oob(struct mtd_info *mtd, loff_t from, ops->oobretlen = 0; ops->retlen = 0; ret = 0; + skip = from % DOC_LAYOUT_PAGE_SIZE; while (!ret && (len > 0 || ooblen > 0)) { - calc_block_sector(from, &block0, &block1, &page, &ofs, + calc_block_sector(from - skip, &block0, &block1, &page, &ofs, docg3->reliable); - nbdata = min_t(size_t, len, (size_t)DOC_LAYOUT_PAGE_SIZE); + nbdata = min_t(size_t, len, DOC_LAYOUT_PAGE_SIZE - skip); nboob = min_t(size_t, ooblen, (size_t)DOC_LAYOUT_OOB_SIZE); ret = doc_read_page_prepare(docg3, block0, block1, page, ofs); if (ret < 0) @@ -893,10 +893,14 @@ static int doc_read_oob(struct mtd_info *mtd, loff_t from, ret = doc_read_page_ecc_init(docg3, DOC_ECC_BCH_TOTAL_BYTES); if (ret < 0) goto err_in_read; - ret = doc_read_page_getbytes(docg3, nbdata, buf, 1); + ret = doc_read_page_getbytes(docg3, skip, NULL, 1); + if (ret < skip) + goto err_in_read; + ret = doc_read_page_getbytes(docg3, nbdata, buf, 0); if (ret < nbdata) goto err_in_read; - doc_read_page_getbytes(docg3, DOC_LAYOUT_PAGE_SIZE - nbdata, + doc_read_page_getbytes(docg3, + DOC_LAYOUT_PAGE_SIZE - nbdata - skip, NULL, 0); ret = doc_read_page_getbytes(docg3, nboob, oobbuf, 0); if (ret < nboob) @@ -950,6 +954,7 @@ static int doc_read_oob(struct mtd_info *mtd, loff_t from, len -= nbdata; ooblen -= nboob; from += DOC_LAYOUT_PAGE_SIZE; + skip = 0; } return ret; |