This is a note to let you know that I've just added the patch titled
mtd: rawnand: meson: fix unaligned DMA buffers handling
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mtd-rawnand-meson-fix-unaligned-dma-buffers-handling.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 98480a181a08ceeede417e5b28f6d0429d8ae156 Mon Sep 17 00:00:00 2001
From: Arseniy Krasnov <AVKrasnov@xxxxxxxxxxxxxx>
Date: Thu, 15 Jun 2023 11:08:15 +0300
Subject: mtd: rawnand: meson: fix unaligned DMA buffers handling
From: Arseniy Krasnov <AVKrasnov@xxxxxxxxxxxxxx>
commit 98480a181a08ceeede417e5b28f6d0429d8ae156 upstream.
Meson NAND controller requires 8 bytes alignment for DMA addresses,
otherwise it "aligns" passed address by itself thus accessing invalid
location in the provided buffer. This patch makes unaligned buffers to
be reallocated to become valid.
Fixes: 8fae856c5350 ("mtd: rawnand: meson: add support for Amlogic NAND flash controller")
Cc: <Stable@xxxxxxxxxxxxxxx>
Signed-off-by: Arseniy Krasnov <AVKrasnov@xxxxxxxxxxxxxx>
Signed-off-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
Link: https://lore.kernel.org/linux-mtd/20230615080815.3291006-1-AVKrasnov@xxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/mtd/nand/raw/meson_nand.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/drivers/mtd/nand/raw/meson_nand.c
+++ b/drivers/mtd/nand/raw/meson_nand.c
@@ -72,6 +72,7 @@
#define GENCMDIADDRH(aih, addr) ((aih) | (((addr) >> 16) & 0xffff))
#define DMA_DIR(dir) ((dir) ? NFC_CMD_N2M : NFC_CMD_M2N)
+#define DMA_ADDR_ALIGN 8
#define ECC_CHECK_RETURN_FF (-1)
@@ -838,6 +839,9 @@ static int meson_nfc_read_oob(struct nan
static bool meson_nfc_is_buffer_dma_safe(const void *buffer)
{
+ if ((uintptr_t)buffer % DMA_ADDR_ALIGN)
+ return false;
+
if (virt_addr_valid(buffer) && (!object_is_on_stack(buffer)))
return true;
return false;
Patches currently in stable-queue which might be from AVKrasnov@xxxxxxxxxxxxxx are
queue-5.4/mtd-rawnand-meson-fix-unaligned-dma-buffers-handling.patch
