ide: add IDE_HFLAG_NO_DSC host flag

* Add IDE_HFLAG_NO_DSC host flag for hosts that doesn't support DSC overlap.

* Set it in aec62xx (for ATP850UF only) and hpt34x host drivers.

* Convert ide-tape device driver to check for IDE_HFLAG_NO_DSC flag.

Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/ide.h b/include/linux/ide.h
index 1b31597e7435..af352cc41db5 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -1095,6 +1095,8 @@ enum {
         IDE_HFLAG_CY82C693              = (1 << 27),
         /* force host out of "simplex" mode */
         IDE_HFLAG_CLEAR_SIMPLEX         = (1 << 28),
+        /* DSC overlap is unsupported */
+        IDE_HFLAG_NO_DSC                = (1 << 29),
 };
 
 #ifdef CONFIG_BLK_DEV_OFFBOARD