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 <[email protected]> Reviewed-by: Bin Meng <[email protected]>
grygoriyS · Aug 26, 2017 · 5c27535 · 5c27535
1 parent 527d865
commit 5c27535
Showing 1 changed file with 1 addition and 1 deletion.
diff --git 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)