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-rw-r--r--target/linux/generic/pending-4.19/411-mtd-partial_eraseblock_write.patch132
1 files changed, 0 insertions, 132 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
deleted file mode 100644
index bf9822fda8..0000000000
--- a/target/linux/generic/pending-4.19/411-mtd-partial_eraseblock_write.patch
+++ /dev/null
@@ -1,132 +0,0 @@
-From: Felix Fietkau <nbd@nbd.name>
-Subject: mtd: implement write support for partitions covering only a part of an eraseblock (buffer data that would otherwise be erased)
-
-lede-commit: 87a8e8ac1067f58ba831c4aae443f3655c31cd80
-Signed-off-by: Felix Fietkau <nbd@nbd.name>
----
- drivers/mtd/mtdpart.c | 90 ++++++++++++++++++++++++++++++++++++++++++++-----
- include/linux/mtd/mtd.h | 4 +++
- 2 files changed, 85 insertions(+), 9 deletions(-)
-
---- a/drivers/mtd/mtdpart.c
-+++ b/drivers/mtd/mtdpart.c
-@@ -36,6 +36,8 @@
- #include "mtdcore.h"
- #include "mtdsplit/mtdsplit.h"
-
-+#define MTD_ERASE_PARTIAL 0x8000 /* partition only covers parts of an erase block */
-+
- /* Our partition linked list */
- static LIST_HEAD(mtd_partitions);
- static DEFINE_MUTEX(mtd_partitions_mutex);
-@@ -220,6 +222,53 @@ 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;
-+
-+ if (mtd->flags & MTD_ERASE_PARTIAL) {
-+ size_t readlen = 0;
-+ u64 mtd_ofs;
-+
-+ erase_buf = kmalloc(part->parent->erasesize, GFP_ATOMIC);
-+ if (!erase_buf)
-+ return -ENOMEM;
-+
-+ mtd_ofs = part->offset + instr->addr;
-+ erase_buf_ofs = do_div(mtd_ofs, part->parent->erasesize);
-+
-+ if (erase_buf_ofs > 0) {
-+ instr->addr -= erase_buf_ofs;
-+ ret = mtd_read(part->parent,
-+ instr->addr + part->offset,
-+ part->parent->erasesize,
-+ &readlen, erase_buf);
-+
-+ instr->len += erase_buf_ofs;
-+ partial_start = true;
-+ } else {
-+ mtd_ofs = part->offset + part->mtd.size;
-+ erase_buf_ofs = part->parent->erasesize -
-+ do_div(mtd_ofs, part->parent->erasesize);
-+
-+ 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,
-+ erase_buf);
-+ } else {
-+ ret = 0;
-+ }
-+ }
-+ if (ret < 0) {
-+ kfree(erase_buf);
-+ return ret;
-+ }
-+
-+ }
-
- instr->addr += part->offset;
- ret = part->parent->_erase(part->parent, instr);
-@@ -227,6 +276,24 @@ 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;
- }
-
-@@ -539,19 +606,22 @@ 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 */
-- /* FIXME: Let it be writable if it is on a boundary of
-- * _minor_ erase size though */
-- slave->mtd.flags &= ~MTD_WRITEABLE;
-- printk(KERN_WARNING"mtd: partition \"%s\" doesn't start on an erase/write block boundary -- force read-only\n",
-- part->name);
-+ slave->mtd.flags |= MTD_ERASE_PARTIAL;
-+ if (((u32)slave->mtd.size) > parent->erasesize)
-+ slave->mtd.flags &= ~MTD_WRITEABLE;
-+ else
-+ slave->mtd.erasesize = slave->mtd.size;
- }
-
-- tmp = part_absolute_offset(parent) + slave->mtd.size;
-+ tmp = part_absolute_offset(parent) + slave->offset + slave->mtd.size;
- remainder = do_div(tmp, wr_alignment);
- if ((slave->mtd.flags & MTD_WRITEABLE) && remainder) {
-- slave->mtd.flags &= ~MTD_WRITEABLE;
-- printk(KERN_WARNING"mtd: partition \"%s\" doesn't end on an erase/write block -- force read-only\n",
-- part->name);
-+ slave->mtd.flags |= MTD_ERASE_PARTIAL;
-+
-+ if ((u32)slave->mtd.size > parent->erasesize)
-+ slave->mtd.flags &= ~MTD_WRITEABLE;
-+ else
-+ slave->mtd.erasesize = slave->mtd.size;
- }
-
- mtd_set_ooblayout(&slave->mtd, &part_ooblayout_ops);