diff options
Diffstat (limited to 'target/linux/generic/pending-4.19/411-mtd-partial_eraseblock_write.patch')
| -rw-r--r-- | target/linux/generic/pending-4.19/411-mtd-partial_eraseblock_write.patch | 106 |
1 files changed, 42 insertions, 64 deletions
diff --git a/target/linux/generic/pending-4.19/411-mtd-partial_eraseblock_write.patch b/target/linux/generic/pending-4.19/411-mtd-partial_eraseblock_write.patch index 3b862dae61..978d6a6f7b 100644 --- a/target/linux/generic/pending-4.19/411-mtd-partial_eraseblock_write.patch +++ b/target/linux/generic/pending-4.19/411-mtd-partial_eraseblock_write.patch @@ -19,95 +19,86 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name> /* Our partition linked list */ static LIST_HEAD(mtd_partitions); static DEFINE_MUTEX(mtd_partitions_mutex); -@@ -255,13 +257,61 @@ static int part_erase(struct mtd_info *m +@@ -221,6 +223,53 @@ static int part_erase(struct mtd_info *m + { struct mtd_part *part = mtd_to_part(mtd); int ret; - ++ size_t wrlen = 0; ++ u8 *erase_buf = NULL; ++ u32 erase_buf_ofs = 0; ++ bool partial_start = false; + -+ instr->partial_start = false; + if (mtd->flags & MTD_ERASE_PARTIAL) { + size_t readlen = 0; + u64 mtd_ofs; + -+ instr->erase_buf = kmalloc(part->parent->erasesize, GFP_ATOMIC); -+ if (!instr->erase_buf) ++ erase_buf = kmalloc(part->parent->erasesize, GFP_ATOMIC); ++ if (!erase_buf) + return -ENOMEM; + + mtd_ofs = part->offset + instr->addr; -+ instr->erase_buf_ofs = do_div(mtd_ofs, part->parent->erasesize); ++ erase_buf_ofs = do_div(mtd_ofs, part->parent->erasesize); + -+ if (instr->erase_buf_ofs > 0) { -+ instr->addr -= instr->erase_buf_ofs; ++ if (erase_buf_ofs > 0) { ++ instr->addr -= erase_buf_ofs; + ret = mtd_read(part->parent, + instr->addr + part->offset, + part->parent->erasesize, -+ &readlen, instr->erase_buf); ++ &readlen, erase_buf); + -+ instr->len += instr->erase_buf_ofs; -+ instr->partial_start = true; ++ instr->len += erase_buf_ofs; ++ partial_start = true; + } else { + mtd_ofs = part->offset + part->mtd.size; -+ instr->erase_buf_ofs = part->parent->erasesize - ++ erase_buf_ofs = part->parent->erasesize - + do_div(mtd_ofs, part->parent->erasesize); + -+ if (instr->erase_buf_ofs > 0) { -+ instr->len += instr->erase_buf_ofs; ++ if (erase_buf_ofs > 0) { ++ instr->len += erase_buf_ofs; + ret = mtd_read(part->parent, + part->offset + instr->addr + + instr->len - part->parent->erasesize, + part->parent->erasesize, &readlen, -+ instr->erase_buf); ++ erase_buf); + } else { + ret = 0; + } + } + if (ret < 0) { -+ kfree(instr->erase_buf); ++ kfree(erase_buf); + return ret; + } + + } -+ + instr->addr += part->offset; ret = part->parent->_erase(part->parent, instr); - if (ret) { - if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN) - instr->fail_addr -= part->offset; - instr->addr -= part->offset; -+ if (mtd->flags & MTD_ERASE_PARTIAL) -+ kfree(instr->erase_buf); - } +@@ -228,6 +277,24 @@ static int part_erase(struct mtd_info *m + instr->fail_addr -= part->offset; + instr->addr -= part->offset; + ++ if (mtd->flags & MTD_ERASE_PARTIAL) { ++ if (partial_start) { ++ part->parent->_write(part->parent, ++ instr->addr, erase_buf_ofs, ++ &wrlen, erase_buf); ++ instr->addr += erase_buf_ofs; ++ } else { ++ instr->len -= erase_buf_ofs; ++ part->parent->_write(part->parent, ++ instr->addr + instr->len, ++ erase_buf_ofs, &wrlen, ++ erase_buf + ++ part->parent->erasesize - ++ erase_buf_ofs); ++ } ++ kfree(erase_buf); ++ } + return ret; } -@@ -269,6 +319,25 @@ void mtd_erase_callback(struct erase_inf - { - if (instr->mtd->_erase == part_erase) { - struct mtd_part *part = mtd_to_part(instr->mtd); -+ size_t wrlen = 0; -+ -+ if (instr->mtd->flags & MTD_ERASE_PARTIAL) { -+ if (instr->partial_start) { -+ part->parent->_write(part->parent, -+ instr->addr, instr->erase_buf_ofs, -+ &wrlen, instr->erase_buf); -+ instr->addr += instr->erase_buf_ofs; -+ } else { -+ instr->len -= instr->erase_buf_ofs; -+ part->parent->_write(part->parent, -+ instr->addr + instr->len, -+ instr->erase_buf_ofs, &wrlen, -+ instr->erase_buf + -+ part->parent->erasesize - -+ instr->erase_buf_ofs); -+ } -+ kfree(instr->erase_buf); -+ } - - if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN) - instr->fail_addr -= part->offset; -@@ -584,19 +653,22 @@ static struct mtd_part *allocate_partiti +@@ -536,19 +603,22 @@ static struct mtd_part *allocate_partiti remainder = do_div(tmp, wr_alignment); if ((slave->mtd.flags & MTD_WRITEABLE) && remainder) { /* Doesn't start on a boundary of major erase size */ @@ -139,16 +130,3 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name> } mtd_set_ooblayout(&slave->mtd, &part_ooblayout_ops); ---- a/include/linux/mtd/mtd.h -+++ b/include/linux/mtd/mtd.h -@@ -56,6 +56,10 @@ struct erase_info { - u_long priv; - u_char state; - struct erase_info *next; -+ -+ u8 *erase_buf; -+ u32 erase_buf_ofs; -+ bool partial_start; - }; - - struct mtd_erase_region_info { |