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, 116 insertions, 0 deletions

diff --git a/target/linux/generic/pending-5.4/440-block2mtd_init.patch b/target/linux/generic/pending-5.4/440-block2mtd_init.patch
new file mode 100644
index 0000000000..b8ec11f3dd
--- /dev/null
+++ b/target/linux/generic/pending-5.4/440-block2mtd_init.patch
@@ -0,0 +1,116 @@
+From: Felix Fietkau <nbd@nbd.name>
+Subject: block2mtd
+
+Signed-off-by: Felix Fietkau <nbd@nbd.name>
+---
+ drivers/mtd/devices/block2mtd.c | 30 ++++++++++++++++++++----------
+ 1 file changed, 20 insertions(+), 10 deletions(-)
+
+--- a/drivers/mtd/devices/block2mtd.c
++++ b/drivers/mtd/devices/block2mtd.c
+@@ -26,6 +26,7 @@
+ #include <linux/list.h>
+ #include <linux/init.h>
+ #include <linux/mtd/mtd.h>
++#include <linux/mtd/partitions.h>
+ #include <linux/mutex.h>
+ #include <linux/mount.h>
+ #include <linux/slab.h>
+@@ -214,7 +215,7 @@ static void block2mtd_free_device(struct
+ 
+ 
+ static struct block2mtd_dev *add_device(char *devname, int erase_size,
+-		int timeout)
++		const char *mtdname, int timeout)
+ {
+ #ifndef MODULE
+ 	int i;
+@@ -222,6 +223,7 @@ static struct block2mtd_dev *add_device(
+ 	const fmode_t mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
+ 	struct block_device *bdev;
+ 	struct block2mtd_dev *dev;
++	struct mtd_partition *part;
+ 	char *name;
+ 
+ 	if (!devname)
+@@ -278,13 +280,16 @@ static struct block2mtd_dev *add_device(
+ 
+ 	/* Setup the MTD structure */
+ 	/* make the name contain the block device in */
+-	name = kasprintf(GFP_KERNEL, "block2mtd: %s", devname);
++	if (!mtdname)
++		mtdname = devname;
++	name = kmalloc(strlen(mtdname) + 1, GFP_KERNEL);
+ 	if (!name)
+ 		goto err_destroy_mutex;
+ 
++	strcpy(name, mtdname);
+ 	dev->mtd.name = name;
+ 
+-	dev->mtd.size = dev->blkdev->bd_inode->i_size & PAGE_MASK;
++	dev->mtd.size = dev->blkdev->bd_inode->i_size & PAGE_MASK & ~(erase_size - 1);
+ 	dev->mtd.erasesize = erase_size;
+ 	dev->mtd.writesize = 1;
+ 	dev->mtd.writebufsize = PAGE_SIZE;
+@@ -297,7 +302,11 @@ static struct block2mtd_dev *add_device(
+ 	dev->mtd.priv = dev;
+ 	dev->mtd.owner = THIS_MODULE;
+ 
+-	if (mtd_device_register(&dev->mtd, NULL, 0)) {
++	part = kzalloc(sizeof(struct mtd_partition), GFP_KERNEL);
++	part->name = name;
++	part->offset = 0;
++	part->size = dev->mtd.size;
++	if (mtd_device_register(&dev->mtd, part, 1)) {
+ 		/* Device didn't get added, so free the entry */
+ 		goto err_destroy_mutex;
+ 	}
+@@ -305,8 +314,7 @@ static struct block2mtd_dev *add_device(
+ 	list_add(&dev->list, &blkmtd_device_list);
+ 	pr_info("mtd%d: [%s] erase_size = %dKiB [%d]\n",
+ 		dev->mtd.index,
+-		dev->mtd.name + strlen("block2mtd: "),
+-		dev->mtd.erasesize >> 10, dev->mtd.erasesize);
++		mtdname, dev->mtd.erasesize >> 10, dev->mtd.erasesize);
+ 	return dev;
+ 
+ err_destroy_mutex:
+@@ -379,7 +387,7 @@ static int block2mtd_setup2(const char *
+ 	/* 80 for device, 12 for erase size, 80 for name, 8 for timeout */
+ 	char buf[80 + 12 + 80 + 8];
+ 	char *str = buf;
+-	char *token[2];
++	char *token[3];
+ 	char *name;
+ 	size_t erase_size = PAGE_SIZE;
+ 	unsigned long timeout = MTD_DEFAULT_TIMEOUT;
+@@ -393,7 +401,7 @@ static int block2mtd_setup2(const char *
+ 	strcpy(str, val);
+ 	kill_final_newline(str);
+ 
+-	for (i = 0; i < 2; i++)
++	for (i = 0; i < 3; i++)
+ 		token[i] = strsep(&str, ",");
+ 
+ 	if (str) {
+@@ -419,8 +427,10 @@ static int block2mtd_setup2(const char *
+ 			return 0;
+ 		}
+ 	}
++	if (token[2] && (strlen(token[2]) + 1 > 80))
++		pr_err("mtd device name too long\n");
+ 
+-	add_device(name, erase_size, timeout);
++	add_device(name, erase_size, token[2], timeout);
+ 
+ 	return 0;
+ }
+@@ -454,7 +464,7 @@ static int block2mtd_setup(const char *v
+ 
+ 
+ module_param_call(block2mtd, block2mtd_setup, NULL, NULL, 0200);
+-MODULE_PARM_DESC(block2mtd, "Device to use. \"block2mtd=<dev>[,<erasesize>]\"");
++MODULE_PARM_DESC(block2mtd, "Device to use. \"block2mtd=<dev>[,<erasesize>[,<name>]]\"");
+ 
+ static int __init block2mtd_init(void)
+ {