[openwrt/openwrt] kernel: mtdsplit_uimage: return 0 if not fatal

[LEDE Commits]

robimarko pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/c78765213ecbe830204e2b75e15a739b7553887f

commit c78765213ecbe830204e2b75e15a739b7553887f
Author: Markus Stockhausen <markus.stockhausen at gmx.de>
AuthorDate: Wed Jun 4 03:19:40 2025 -0400

    kernel: mtdsplit_uimage: return 0 if not fatal
    
    Introduced with Linux 6.7, in commit:
    5c2f7727d437 ("mtd: mtdpart: check for subpartitions parsing result"),
    when a parser returns an error, this will be passed up, and
    consequently, all parent mtd partitions get torn down.
    
    Adjust the mtdsplit_uimage driver to only return an error if there is a
    critical problem in reading from the mtd device or allocating memory.
    Otherwise return 0 to indicate that no partitions were found.
    Also add logging to indicate what went wrong.
    
    E.g. on Realtek devices that are booted for the first time through
    initramfs with OpenWrt never installed before boot log will show
    
    [    0.932985] Creating 8 MTD partitions on "spi0.0":
    [    0.938412] 0x000000000000-0x000000080000 : "u-boot"
    [    0.990151] 0x000000080000-0x0000000c0000 : "u-boot-env"
    [    0.999907] 0x0000000c0000-0x000000100000 : "board-name"
    [    1.019971] 0x000000100000-0x000000e80000 : "firmware"
    [    1.051582] mtdsplit_uimage: no uImage found in "firmware"
    [    1.069365] 0x000000e80000-0x000001000000 : "kernel2"
    [    1.078959] 0x000001000000-0x000001040000 : "sysinfo"
    [    1.099747] 0x000001040000-0x000001c40000 : "rootfs2"
    [    1.119865] 0x000001c40000-0x000002000000 : "jffs2"
    
    Similar issue was fixed before with commit ade045084bd3f8696
    ("kernel: mtdsplit_minor: return 0 if not fatal")
    
    Signed-off-by: Markus Stockhausen <markus.stockhausen at gmx.de>
    Link: https://github.com/openwrt/openwrt/pull/19016
    Signed-off-by: Robert Marko <robimarko at gmail.com>
---
 target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_uimage.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_uimage.c b/target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_uimage.c
index a3e55fb1fe..1962cd8f2b 100644
--- a/target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_uimage.c
+++ b/target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_uimage.c
@@ -186,8 +186,8 @@ static int __mtdsplit_parse_uimage(struct mtd_info *master,
 	}
 
 	if (uimage_size == 0) {
-		pr_debug("no uImage found in \"%s\"\n", master->name);
-		ret = -ENODEV;
+		pr_info("no uImage found in \"%s\"\n", master->name);
+		ret = 0;
 		goto err_free_buf;
 	}