1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/ide/cmd64x.c b/drivers/ide/cmd64x.c
index 680e5975217f..ca0c46f6580a 100644
--- a/drivers/ide/cmd64x.c
+++ b/drivers/ide/cmd64x.c
@@ -379,7 +379,8 @@ static const struct ide_port_info cmd64x_chipsets[] __devinitdata = {
                 .enablebits     = {{0x00,0x00,0x00}, {0x51,0x08,0x08}},
                 .port_ops       = &cmd64x_port_ops,
                 .host_flags     = IDE_HFLAG_CLEAR_SIMPLEX |
-                                  IDE_HFLAG_ABUSE_PREFETCH,
+                                  IDE_HFLAG_ABUSE_PREFETCH |
+                                  IDE_HFLAG_SERIALIZE,
                 .pio_mask       = ATA_PIO5,
                 .mwdma_mask     = ATA_MWDMA2,
                 .udma_mask      = 0x00, /* no udma */
@@ -389,7 +390,8 @@ static const struct ide_port_info cmd64x_chipsets[] __devinitdata = {
                 .init_chipset   = init_chipset_cmd64x,
                 .enablebits     = {{0x51,0x04,0x04}, {0x51,0x08,0x08}},
                 .port_ops       = &cmd648_port_ops,
-                .host_flags     = IDE_HFLAG_ABUSE_PREFETCH,
+                .host_flags     = IDE_HFLAG_ABUSE_PREFETCH |
+                                  IDE_HFLAG_SERIALIZE,
                 .pio_mask       = ATA_PIO5,
                 .mwdma_mask     = ATA_MWDMA2,
                 .udma_mask      = ATA_UDMA2,