target/linux/layerscape/patches-4.4/1112-driver-spi-fsl-quad-Hang-memcpy-Unhandled-fault-alig.patch

   1 From f1b7824a42505669476f203e126fc26dd1006af2 Mon Sep 17 00:00:00 2001
   2 From: Yutang Jiang <yutang.jiang@nxp.com>
   3 Date: Fri, 9 Sep 2016 22:57:55 +0800
   4 Subject: [PATCH 112/113] driver: spi: fsl-quad: Hang memcpy: Unhandled fault:
   5  alignment fault
   6
   7 vmap/iomap based on whether the buffer is in memory region or reserved region.
   8 However, both map it as non-cacheable memory.
   9 For armv8 specifically, non-cacheable mapping requests use a memory type
  10 that has to be accessed aligned to the request size. memcpy() doesn't guarantee
  11 that. memcpy_toio() can guarantee 4-bytes alignment.
  12
  13 Signed-off-by: Yunhui Cui <yunhui.cui@nxp.com>
  14 Integrated-by: Yutang Jiang <yutang.jiang@nxp.com>
  15 ---
  16  drivers/mtd/spi-nor/fsl-quadspi.c |    2 +-
  17  1 file changed, 1 insertion(+), 1 deletion(-)
  18
  19 --- a/drivers/mtd/spi-nor/fsl-quadspi.c
  20 +++ b/drivers/mtd/spi-nor/fsl-quadspi.c
  21 @@ -1103,7 +1103,7 @@ static ssize_t fsl_qspi_read(struct spi_
  22                 len);
  23
  24         /* Read out the data directly from the AHB buffer.*/
  25 -       memcpy(buf, q->ahb_addr + q->chip_base_addr + from - q->memmap_offs,
  26 +       memcpy_toio(buf, q->ahb_addr + q->chip_base_addr + from - q->memmap_offs,
  27                 len);
  28
  29         return len;