libata-pmp-prep: implement ATA_LFLAG_DISABLED

Implement ATA_LFLAG_DISABLED.  The flag indicates the link is disabled
due to EH recovery failure.  While a link is disabled, no EH action is
taken on the link and suspend/resume become noop too.

This will be used by PMP links to manage failed links.

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

1 files changed, 3 insertions, 0 deletions

diff --git a/include/linux/libata.h b/include/linux/libata.h
index adeee7397cdb..2bd1d26c9c8d 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -170,6 +170,7 @@ enum {
         ATA_LFLAG_ASSUME_SEMB   = (1 << 4), /* assume SEMB class */
         ATA_LFLAG_ASSUME_CLASS  = ATA_LFLAG_ASSUME_ATA | ATA_LFLAG_ASSUME_SEMB,
         ATA_LFLAG_NO_RETRY      = (1 << 5), /* don't retry this link */
+        ATA_LFLAG_DISABLED      = (1 << 6), /* link is disabled */
 
         /* struct ata_port flags */
         ATA_FLAG_SLAVE_POSS     = (1 << 0), /* host supports slave dev */
@@ -289,6 +290,7 @@ enum {
         ATA_EH_REVALIDATE       = (1 << 0),
         ATA_EH_SOFTRESET        = (1 << 1),
         ATA_EH_HARDRESET        = (1 << 2),
+        ATA_EH_ENABLE_LINK      = (1 << 3),
 
         ATA_EH_RESET_MASK       = ATA_EH_SOFTRESET | ATA_EH_HARDRESET,
         ATA_EH_PERDEV_MASK      = ATA_EH_REVALIDATE,
@@ -999,6 +1001,7 @@ static inline void ata_ehi_hotplugged(struct ata_eh_info *ehi)
 {
         ata_ehi_schedule_probe(ehi);
         ehi->flags |= ATA_EHI_HOTPLUGGED;
+        ehi->action |= ATA_EH_ENABLE_LINK;
         ehi->err_mask |= AC_ERR_ATA_BUS;
 }