From f570c806ef507abc827f5ffaa5cc6d24ccd33585 Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Wed, 10 Oct 2012 11:38:44 +0000 Subject: [PATCH] mtd: allow partial block unlock This allows sysupgrade for devices such as the Gateworks Avila/Cambria product families based on the ixp4xx using the redboot bootloader with combined FIS directory and RedBoot config partitions on larger FLASH devices with larger eraseblocks. This second iteration of this patch addresses previous issues: - whitespace breakage fixed - unlock in all scenarios - simplification and fix logic bug Signed-off-by: Tim Harvey SVN-Revision: 33681 --- .../478-mtd-partial_eraseblock_unlock.patch | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) create mode 100644 target/linux/generic/patches-3.3/478-mtd-partial_eraseblock_unlock.patch diff --git a/target/linux/generic/patches-3.3/478-mtd-partial_eraseblock_unlock.patch b/target/linux/generic/patches-3.3/478-mtd-partial_eraseblock_unlock.patch new file mode 100644 index 0000000000..de4481a93a --- /dev/null +++ b/target/linux/generic/patches-3.3/478-mtd-partial_eraseblock_unlock.patch @@ -0,0 +1,18 @@ +--- a/drivers/mtd/mtdpart.c ++++ b/drivers/mtd/mtdpart.c +@@ -356,7 +356,14 @@ static int part_unlock(struct mtd_info * + struct mtd_part *part = PART(mtd); + if ((len + ofs) > mtd->size) + return -EINVAL; +- return mtd_unlock(part->master, ofs + part->offset, len); ++ ++ ofs += part->offset; ++ if (mtd->flags & MTD_ERASE_PARTIAL) { ++ /* round up len to next erasesize and round down offset to prev block */ ++ len = (mtd_div_by_eb(len, part->master) + 1) * part->master->erasesize; ++ ofs &= ~(part->master->erasesize - 1); ++ } ++ return mtd_unlock(part->master, ofs, len); + } + + static int part_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len) -- 2.30.2