[PATCH] libata: always use polling IDENTIFY

libata switched to IRQ-driven IDENTIFY when IRQ-driven PIO was
introduced.  This has caused a lot of problems including device
misdetection and phantom device.

ATA_FLAG_DETECT_POLLING was added recently to selectively use polling
IDENTIFY on problemetic drivers but many controllers and devices are
affected by this problem and trying to adding ATA_FLAG_DETECT_POLLING
for each such case is diffcult and not very rewarding.

This patch makes libata always use polling IDENTIFY.  This is
consistent with libata's original behavior and drivers/ide's behavior.

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

1 files changed, 1 insertions, 3 deletions

diff --git a/include/linux/libata.h b/include/linux/libata.h
index 8b57b6a806cc..202283b5df96 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -176,9 +176,7 @@ enum {
         ATA_FLAG_SKIP_D2H_BSY   = (1 << 12), /* can't wait for the first D2H
                                               * Register FIS clearing BSY */
         ATA_FLAG_DEBUGMSG       = (1 << 13),
-        ATA_FLAG_DETECT_POLLING = (1 << 14), /* detect device presence by
-                                              * polling IDENTIFY */
-        ATA_FLAG_SETXFER_POLLING= (1 << 15), /* use polling for SETXFER */
+        ATA_FLAG_SETXFER_POLLING= (1 << 14), /* use polling for SETXFER */
 
         /* The following flag belongs to ap->pflags but is kept in
          * ap->flags because it's referenced in many LLDs and will be