UBI: add a commentary about allocating VID header buffer on stack

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/mtd/ubi/io.c b/drivers/mtd/ubi/io.c
index 668d24005106..65915a649861 100644
--- a/drivers/mtd/ubi/io.c
+++ b/drivers/mtd/ubi/io.c
@@ -480,6 +480,13 @@ static int nor_erase_prepare(struct ubi_device *ubi, int pnum)
         size_t written;
         loff_t addr;
         uint32_t data = 0;
+        /*
+         * Note, we cannot generally define VID header buffers on stack,
+         * because of the way we deal with these buffers (see the header
+         * comment in this file). But we know this is a NOR-specific piece of
+         * code, so we can do this. But yes, this is error-prone and we should
+         * (pre-)allocate VID header buffer instead.
+         */
         struct ubi_vid_hdr vid_hdr;
 
         /*