[source] brcm63xx: remove misleading warning about partial SPI NOR writes

[LEDE Commits]

jogo pushed a commit to source.git, branch master:
https://git.lede-project.org/a0bb6c91fee399fd2008bff571ec77fd57742f27

commit a0bb6c91fee399fd2008bff571ec77fd57742f27
Author: Jonas Gorski <jonas.gorski at gmail.com>
AuthorDate: Wed Jul 5 10:53:00 2017 +0200

    brcm63xx: remove misleading warning about partial SPI NOR writes
    
    The warning will be triggered by jffs2 or UBI, and partial writes are no
    issue for most flash chips.
    
    Fixes: 2a2b16210bbc ("brcm63xx: backport upstream solution for SPI message size limits")
    Signed-off-by: Jonas Gorski <jonas.gorski at gmail.com>
---
 ...-remove-WARN_ONCE-message-in-spi_nor_writ.patch | 33 ++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/target/linux/brcm63xx/patches-4.4/001-4.11-02-mtd-spi-nor-remove-WARN_ONCE-message-in-spi_nor_writ.patch b/target/linux/brcm63xx/patches-4.4/001-4.11-02-mtd-spi-nor-remove-WARN_ONCE-message-in-spi_nor_writ.patch
new file mode 100644
index 0000000..7c70d20
--- /dev/null
+++ b/target/linux/brcm63xx/patches-4.4/001-4.11-02-mtd-spi-nor-remove-WARN_ONCE-message-in-spi_nor_writ.patch
@@ -0,0 +1,33 @@
+From bc0e151514d09cadb56e473a10c783e64e48ce0b Mon Sep 17 00:00:00 2001
+From: Cyrille Pitchen <cyrille.pitchen at atmel.com>
+Date: Tue, 6 Dec 2016 18:14:24 +0100
+Subject: [PATCH] mtd: spi-nor: remove WARN_ONCE() message in spi_nor_write()
+
+This patch removes the WARN_ONCE() test in spi_nor_write().
+This macro triggers the display of a warning message almost every time we
+use a UBI file-system because a write operation is performed at offset 64,
+which is in the middle of the SPI NOR memory page. This is a valid
+operation for ubifs.
+
+Hence this warning is pretty annoying and useless so we just remove it.
+
+Signed-off-by: Cyrille Pitchen <cyrille.pitchen at atmel.com>
+Suggested-by: Richard Weinberger <richard at nod.at>
+Suggested-by: Andras Szemzo <szemzo.andras at gmail.com>
+Acked-by: Boris Brezillon <boris.brezillon at free-electrons.com>
+---
+ drivers/mtd/spi-nor/spi-nor.c | 3 ---
+ 1 file changed, 3 deletions(-)
+
+--- a/drivers/mtd/spi-nor/spi-nor.c
++++ b/drivers/mtd/spi-nor/spi-nor.c
+@@ -1014,9 +1014,6 @@ static int spi_nor_write(struct mtd_info
+ 		ssize_t written;
+ 
+ 		page_offset = (to + i) & (nor->page_size - 1);
+-		WARN_ONCE(page_offset,
+-			  "Writing at offset %zu into a NOR page. Writing partial pages may decrease reliability and increase wear of NOR flash.",
+-			  page_offset);
+ 		/* the size of data remaining on the first page */
+ 		page_remain = min_t(size_t,
+ 				    nor->page_size - page_offset, len - i);