From: Stefan Agner <stefan.agner@toradex.com>
Date: Wed, 23 Aug 2017 16:46:17 +0000 (-0700)
Subject: disk: part: align buffer so it can be used with DMA enabled drivers
X-Git-Tag: v2017.09-rc3~27
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=5c27535dc9a0a4858cb3efad2400ffe83c678441;p=platform%2Fkernel%2Fu-boot.git

disk: part: align buffer so it can be used with DMA enabled drivers

When using ISO partitions with a DMA enabled block device driver
reading the ISO partition leads to unaligned DMA operations:
  CACHE: Misaligned operation at range [bffb7da8, bffb85a8]

Align the buffer to make sure we pass a buffer which works for
DMA operations.

Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
---

diff --git a/disk/part_iso.c b/disk/part_iso.c
index bb8ed65..8aef251 100644
--- a/disk/part_iso.c
+++ b/disk/part_iso.c
@@ -24,7 +24,7 @@
 #undef CHECK_FOR_POWERPC_PLATTFORM
 #define CD_SECTSIZE 2048
 
-static unsigned char tmpbuf[CD_SECTSIZE];
+static unsigned char tmpbuf[CD_SECTSIZE] __aligned(ARCH_DMA_MINALIGN);
 
 unsigned long iso_dread(struct blk_desc *block_dev, lbaint_t start,
                         lbaint_t blkcnt, void *buffer)