[PATCH] libata: implement per-dev EH action mask eh_info->dev_action[]

Currently, the only per-dev EH action is REVALIDATE.  EH used to
exploit ehi->dev to do selective revalidation on a ATA bus.  However,
this is a bit hacky and makes it impossible to request selective
revalidation from outside of EH or add another per-dev EH action.

This patch adds per-dev EH action mask eh_info->dev_action[] and
update EH to use this field for REVALIDATE.  Note that per-dev actions
can still be specified at port-level and it has the same effect of
specifying the action for all devices on the port.

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

1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/libata.h b/include/linux/libata.h
index f03b8664af11..6b3c3af2c75f 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -249,6 +249,7 @@ enum {
         ATA_EH_HARDRESET        = (1 << 2),
 
         ATA_EH_RESET_MASK       = ATA_EH_SOFTRESET | ATA_EH_HARDRESET,
+        ATA_EH_PERDEV_MASK      = ATA_EH_REVALIDATE,
 
         /* ata_eh_info->flags */
         ATA_EHI_HOTPLUGGED      = (1 << 0),  /* could have been hotplugged */
@@ -462,6 +463,7 @@ struct ata_eh_info {
         u32                     serror;         /* SError from LLDD */
         unsigned int            err_mask;       /* port-wide err_mask */
         unsigned int            action;         /* ATA_EH_* action mask */
+        unsigned int            dev_action[ATA_MAX_DEVICES]; /* dev EH action */
         unsigned int            flags;          /* ATA_EHI_* flags */
 
         unsigned long           hotplug_timestamp;