kernel: copy kernel 4.19 code to 5.4

No changes were done to the patches while coping them. Currently they do
not apply on top of kernel 5.4.

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

1 files changed, 55 insertions, 0 deletions

diff --git a/target/linux/generic/backport-5.4/048-v4.21-mtd-improve-calculating-partition-boundaries-when-ch.patch b/target/linux/generic/backport-5.4/048-v4.21-mtd-improve-calculating-partition-boundaries-when-ch.patch
new file mode 100644
index 0000000000..02296276b0
--- /dev/null
+++ b/target/linux/generic/backport-5.4/048-v4.21-mtd-improve-calculating-partition-boundaries-when-ch.patch
@@ -0,0 +1,55 @@
+From 6750f61a13a0197c40e4a40739117493b15f19e8 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
+Date: Tue, 20 Nov 2018 10:24:09 +0100
+Subject: [PATCH] mtd: improve calculating partition boundaries when checking
+ for alignment
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+When checking for alignment mtd should check absolute offsets. It's
+important for subpartitions as it doesn't make sense to check their
+relative addresses.
+
+Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
+Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
+---
+ drivers/mtd/mtdpart.c | 13 +++++++++++--
+ 1 file changed, 11 insertions(+), 2 deletions(-)
+
+--- a/drivers/mtd/mtdpart.c
++++ b/drivers/mtd/mtdpart.c
+@@ -61,6 +61,15 @@ static inline struct mtd_part *mtd_to_pa
+ 	return container_of(mtd, struct mtd_part, mtd);
+ }
+ 
++static u64 part_absolute_offset(struct mtd_info *mtd)
++{
++	struct mtd_part *part = mtd_to_part(mtd);
++
++	if (!mtd_is_partition(mtd))
++		return 0;
++
++	return part_absolute_offset(part->parent) + part->offset;
++}
+ 
+ /*
+  * MTD methods which simply translate the effective address and pass through
+@@ -518,7 +527,7 @@ static struct mtd_part *allocate_partiti
+ 	if (!(slave->mtd.flags & MTD_NO_ERASE))
+ 		wr_alignment = slave->mtd.erasesize;
+ 
+-	tmp = slave->offset;
++	tmp = part_absolute_offset(parent) + slave->offset;
+ 	remainder = do_div(tmp, wr_alignment);
+ 	if ((slave->mtd.flags & MTD_WRITEABLE) && remainder) {
+ 		/* Doesn't start on a boundary of major erase size */
+@@ -529,7 +538,7 @@ static struct mtd_part *allocate_partiti
+ 			part->name);
+ 	}
+ 
+-	tmp = slave->mtd.size;
++	tmp = part_absolute_offset(parent) + slave->mtd.size;
+ 	remainder = do_div(tmp, wr_alignment);
+ 	if ((slave->mtd.flags & MTD_WRITEABLE) && remainder) {
+ 		slave->mtd.flags &= ~MTD_WRITEABLE;