kernel: Copy patches from kernel 4.14 to 4.19

This just copies the files from the kernel 4.14 specific folders into
the kernel 4.19 specific folder, no changes are done to the files in
this commit.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

1 files changed, 154 insertions, 0 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
new file mode 100644
index 0000000000..3b862dae61
--- /dev/null
+++ b/target/linux/generic/pending-4.19/411-mtd-partial_eraseblock_write.patch
@@ -0,0 +1,154 @@
+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
+@@ -37,6 +37,8 @@
+ #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);
+@@ -255,13 +257,61 @@ static int part_erase(struct mtd_info *m
+ 	struct mtd_part *part = mtd_to_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->parent->erasesize, GFP_ATOMIC);
++		if (!instr->erase_buf)
++			return -ENOMEM;
++
++		mtd_ofs = part->offset + instr->addr;
++		instr->erase_buf_ofs = do_div(mtd_ofs, part->parent->erasesize);
++
++		if (instr->erase_buf_ofs > 0) {
++			instr->addr -= instr->erase_buf_ofs;
++			ret = mtd_read(part->parent,
++				instr->addr + part->offset,
++				part->parent->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->parent->erasesize -
++				do_div(mtd_ofs, part->parent->erasesize);
++
++			if (instr->erase_buf_ofs > 0) {
++				instr->len += instr->erase_buf_ofs;
++				ret = mtd_read(part->parent,
++					part->offset + instr->addr +
++					instr->len - part->parent->erasesize,
++					part->parent->erasesize, &readlen,
++					instr->erase_buf);
++			} else {
++				ret = 0;
++			}
++		}
++		if (ret < 0) {
++			kfree(instr->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);
+ 	}
++
+ 	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
+ 	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);
+--- 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 {