Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/libata-dev

* 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/libata-dev:
  [libata] ata_piix: Enable parallel scan
  sata_nv: use hardreset only for post-boot probing
  [libata] ahci: Restore SB600 SATA controller 64 bit DMA
  ata_piix: Remove stale comment
  ata_piix: Turn on hotplugging support for older chips
  ahci: misc cleanups for EM stuff
  [libata] get rid of ATA_MAX_QUEUE loop in ata_qc_complete_multiple() v2
  sata_sil: enable 32-bit PIO
  sata_sx4: speed up ECC initialization
  libata-sff: avoid byte swapping in ata_sff_data_xfer()
  [libata] ahci: use less error-prone array initializers

1 files changed, 13 insertions, 7 deletions

diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
index bb18415d3d63..bbbb1fab1755 100644
--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -727,17 +727,23 @@ unsigned int ata_sff_data_xfer(struct ata_device *dev, unsigned char *buf,
         else
                 iowrite16_rep(data_addr, buf, words);
 
-        /* Transfer trailing 1 byte, if any. */
+        /* Transfer trailing byte, if any. */
         if (unlikely(buflen & 0x01)) {
-                __le16 align_buf[1] = { 0 };
-                unsigned char *trailing_buf = buf + buflen - 1;
+                unsigned char pad[2];
 
+                /* Point buf to the tail of buffer */
+                buf += buflen - 1;
+
+                /*
+                 * Use io*16_rep() accessors here as well to avoid pointlessly
+                 * swapping bytes to and fro on the big endian machines...
+                 */
                 if (rw == READ) {
-                        align_buf[0] = cpu_to_le16(ioread16(data_addr));
-                        memcpy(trailing_buf, align_buf, 1);
+                        ioread16_rep(data_addr, pad, 1);
+                        *buf = pad[0];
                 } else {
-                        memcpy(align_buf, trailing_buf, 1);
-                        iowrite16(le16_to_cpu(align_buf[0]), data_addr);
+                        pad[0] = *buf;
+                        iowrite16_rep(data_addr, pad, 1);
                 }
                 words++;
         }