From 74d00a8c3849c1340efd713eb94b786e304c201f Mon Sep 17 00:00:00 2001
From: John Crispin <john@phrozen.org>
Date: Sun, 25 Dec 2016 20:11:34 +0100
Subject: kernel: split patches folder up into backport, pending and hack
folders
* properly format/comment all patches
* merge debloat patches
* merge Kconfig patches
* merge swconfig patches
* merge hotplug patches
* drop 200-fix_localversion.patch - upstream
* drop 222-arm_zimage_none.patch - unused
* drop 252-mv_cesa_depends.patch - no longer required
* drop 410-mtd-move-forward-declaration-of-struct-mtd_info.patch - unused
* drop 661-fq_codel_keep_dropped_stats.patch - outdated
* drop 702-phy_add_aneg_done_function.patch - upstream
* drop 840-rtc7301.patch - unused
* drop 841-rtc_pt7c4338.patch - upstream
* drop 921-use_preinit_as_init.patch - unused
* drop spio-gpio-old and gpio-mmc - unused
Signed-off-by: John Crispin <john@phrozen.org>
---
.../411-mtd-partial_eraseblock_write.patch | 142 +++++++++++++++++++++
1 file changed, 142 insertions(+)
create mode 100644 target/linux/generic/pending-3.18/411-mtd-partial_eraseblock_write.patch
(limited to 'target/linux/generic/pending-3.18/411-mtd-partial_eraseblock_write.patch')
diff --git a/target/linux/generic/pending-3.18/411-mtd-partial_eraseblock_write.patch b/target/linux/generic/pending-3.18/411-mtd-partial_eraseblock_write.patch
new file mode 100644
index 0000000..5d5c6ed
--- /dev/null
+++ b/target/linux/generic/pending-3.18/411-mtd-partial_eraseblock_write.patch
@@ -0,0 +1,142 @@
+--- 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);
+@@ -234,13 +236,61 @@ static int part_erase(struct mtd_info *m
+ struct mtd_part *part = PART(mtd);
+ int ret;
+
++
++ instr->partial_start = false;
++ if (mtd->flags & MTD_ERASE_PARTIAL) {
++ size_t readlen = 0;
++ u64 mtd_ofs;
++
++ instr->erase_buf = kmalloc(part->master->erasesize, GFP_ATOMIC);
++ if (!instr->erase_buf)
++ return -ENOMEM;
++
++ mtd_ofs = part->offset + instr->addr;
++ instr->erase_buf_ofs = do_div(mtd_ofs, part->master->erasesize);
++
++ if (instr->erase_buf_ofs > 0) {
++ instr->addr -= instr->erase_buf_ofs;
++ ret = mtd_read(part->master,
++ instr->addr + part->offset,
++ part->master->erasesize,
++ &readlen, instr->erase_buf);
++
++ instr->len += instr->erase_buf_ofs;
++ instr->partial_start = true;
++ } else {
++ mtd_ofs = part->offset + part->mtd.size;
++ instr->erase_buf_ofs = part->master->erasesize -
++ do_div(mtd_ofs, part->master->erasesize);
++
++ if (instr->erase_buf_ofs > 0) {
++ instr->len += instr->erase_buf_ofs;
++ ret = mtd_read(part->master,
++ part->offset + instr->addr +
++ instr->len - part->master->erasesize,
++ part->master->erasesize, &readlen,
++ instr->erase_buf);
++ } else {
++ ret = 0;
++ }
++ }
++ if (ret < 0) {
++ kfree(instr->erase_buf);
++ return ret;
++ }
++
++ }
++
+ instr->addr += part->offset;
+ ret = part->master->_erase(part->master, 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);
+ }
++
+ return ret;
+ }
+
+@@ -248,7 +298,25 @@ void mtd_erase_callback(struct erase_inf
+ {
+ if (instr->mtd->_erase == part_erase) {
+ struct mtd_part *part = PART(instr->mtd);
++ size_t wrlen = 0;
+
++ if (instr->mtd->flags & MTD_ERASE_PARTIAL) {
++ if (instr->partial_start) {
++ part->master->_write(part->master,
++ instr->addr, instr->erase_buf_ofs,
++ &wrlen, instr->erase_buf);
++ instr->addr += instr->erase_buf_ofs;
++ } else {
++ instr->len -= instr->erase_buf_ofs;
++ part->master->_write(part->master,
++ instr->addr + instr->len,
++ instr->erase_buf_ofs, &wrlen,
++ instr->erase_buf +
++ part->master->erasesize -
++ instr->erase_buf_ofs);
++ }
++ kfree(instr->erase_buf);
++ }
+ if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
+ instr->fail_addr -= part->offset;
+ instr->addr -= part->offset;
+@@ -515,17 +583,20 @@ static struct mtd_part *allocate_partiti
+ if ((slave->mtd.flags & MTD_WRITEABLE) &&
+ mtd_mod_by_eb(slave->offset, &slave->mtd)) {
+ /* 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 block boundary -- force read-only\n",
+- part->name);
++ slave->mtd.flags |= MTD_ERASE_PARTIAL;
++ if (((u32) slave->mtd.size) > master->erasesize)
++ slave->mtd.flags &= ~MTD_WRITEABLE;
++ else
++ slave->mtd.erasesize = slave->mtd.size;
+ }
+ if ((slave->mtd.flags & MTD_WRITEABLE) &&
+- mtd_mod_by_eb(slave->mtd.size, &slave->mtd)) {
+- slave->mtd.flags &= ~MTD_WRITEABLE;
+- printk(KERN_WARNING"mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
+- part->name);
++ mtd_mod_by_eb(slave->offset + slave->mtd.size, &slave->mtd)) {
++ slave->mtd.flags |= MTD_ERASE_PARTIAL;
++
++ if ((u32) slave->mtd.size > master->erasesize)
++ slave->mtd.flags &= ~MTD_WRITEABLE;
++ else
++ slave->mtd.erasesize = slave->mtd.size;
+ }
+
+ slave->mtd.ecclayout = master->ecclayout;
+--- a/include/linux/mtd/mtd.h
++++ b/include/linux/mtd/mtd.h
+@@ -55,6 +55,10 @@ 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 {
--
cgit v1.1