[PATCH] libata: remove unused HSM_ST_UNKNOWN

HSM_ST_UNKNOWN is not used anywhere.  Its value is zero and supposed
to serve sanity check purpose but HSM_ST_IDLE is used for that
purpose.  This unused state causes confusion.  After a port is
initialized but before the first command is executed, the idle hsm
state is UNKNOWN.  However, once a command has completed, the idle hsm
state is IDLE.  This defeats sanity check in ata_pio_task() for the
first command.

This patch removes HSM_ST_UNKNOWN and consequently make HSM_ST_IDLE
the default state.

Signed-off-by: Tejun Heo <htejun@gmail.com>

1 files changed, 0 insertions, 1 deletions

diff --git a/include/linux/libata.h b/include/linux/libata.h
index 9080789913f7..6013211ac7de 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -318,7 +318,6 @@ enum {
 };
 
 enum hsm_task_states {
-        HSM_ST_UNKNOWN,         /* state unknown */
         HSM_ST_IDLE,            /* no command on going */
         HSM_ST,                 /* (waiting the device to) transfer data */
         HSM_ST_LAST,            /* (waiting the device to) complete command */