[PATCH] libata: add per-dev pio/mwdma/udma_mask

Add per-dev pio/mwdma/udma_mask.  All transfer mode limits used to be
applied to ap->*_mask which unnecessarily restricted other devices
sharing the port.  This change will also benefit later EH speed down
and hotplug.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/include/linux/libata.h b/include/linux/libata.h
index 7a54244d30aa..fbe8ba212598 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -358,6 +358,11 @@ struct ata_device {
         unsigned int            max_sectors;    /* per-device max sectors */
         unsigned int            cdb_len;
 
+        /* per-dev xfer mask */
+        unsigned int            pio_mask;
+        unsigned int            mwdma_mask;
+        unsigned int            udma_mask;
+
         /* for CHS addressing */
         u16                     cylinders;      /* Number of cylinders */
         u16                     heads;          /* Number of heads */