This bug applied where mtd partition end address, or erase start address, was not cleanly divisible by parent mtd erasesize.
This error would cause the bits following the end of the partition to the next erasesize block boundary to be erased, and this partition-overflow data to be written to the partition erase address (missing additional partition offset address) of the mtd (top) parent device. Signed-off-by: John Thomson <[email protected]> -- 4.19 also requires this fix A little discussion here: https://github.com/openwrt/openwrt/pull/3103#issuecomment-667610510 mtdpart.c should be made to work with 4K erase sectors, where available Considering this here: https://github.com/openwrt/openwrt/pull/3271 --- .../411-mtd-partial_eraseblock_write.patch | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) diff --git a/target/linux/generic/pending-5.4/411-mtd-partial_eraseblock_write.patch b/target/linux/generic/pending-5.4/411-mtd-partial_eraseblock_write.patch index b46c3f5ed4..c48a144d3d 100644 --- a/target/linux/generic/pending-5.4/411-mtd-partial_eraseblock_write.patch +++ b/target/linux/generic/pending-5.4/411-mtd-partial_eraseblock_write.patch @@ -19,7 +19,7 @@ Signed-off-by: Felix Fietkau <[email protected]> /* Our partition linked list */ static LIST_HEAD(mtd_partitions); static DEFINE_MUTEX(mtd_partitions_mutex); -@@ -206,6 +208,53 @@ static int part_erase(struct mtd_info *m +@@ -206,11 +208,77 @@ static int part_erase(struct mtd_info *m { struct mtd_part *part = mtd_to_part(mtd); int ret; @@ -73,10 +73,9 @@ Signed-off-by: Felix Fietkau <[email protected]> instr->addr += part->offset; ret = part->parent->_erase(part->parent, instr); -@@ -213,6 +262,24 @@ static int part_erase(struct mtd_info *m + if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN) instr->fail_addr -= part->offset; - instr->addr -= part->offset; - ++ + if (mtd->flags & MTD_ERASE_PARTIAL) { + if (partial_start) { + part->parent->_write(part->parent, @@ -95,10 +94,10 @@ Signed-off-by: Felix Fietkau <[email protected]> + kfree(erase_buf); + } + - return ret; - } + instr->addr -= part->offset; -@@ -525,19 +592,22 @@ static struct mtd_part *allocate_partiti + return ret; +@@ -525,19 +593,22 @@ 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 */ -- 2.28.0 _______________________________________________ openwrt-devel mailing list [email protected] https://lists.openwrt.org/mailman/listinfo/openwrt-devel
