libata: transfer EHI control flags to slave ehc.i

ATA_EHI_NO_AUTOPSY and ATA_EHI_QUIET are used to control the behavior
of EH.  As only the master link is visible outside EH, these flags are
set only for the master link although they should also apply to the
slave link, which causes spurious EH messages during probe and
suspend/resume.

This patch transfers those two flags to slave ehc.i before performing
slave autopsy and reporting.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

2 files changed, 8 insertions, 0 deletions

diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index a93247cc395a..d2409a8acece 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -2010,8 +2010,13 @@ void ata_eh_autopsy(struct ata_port *ap)
                 struct ata_eh_context *mehc = &ap->link.eh_context;
                 struct ata_eh_context *sehc = &ap->slave_link->eh_context;
 
+                /* transfer control flags from master to slave */
+                sehc->i.flags |= mehc->i.flags & ATA_EHI_TO_SLAVE_MASK;
+
+                /* perform autopsy on the slave link */
                 ata_eh_link_autopsy(ap->slave_link);
 
+                /* transfer actions from slave to master and clear slave */
                 ata_eh_about_to_do(ap->slave_link, NULL, ATA_EH_ALL_ACTIONS);
                 mehc->i.action          |= sehc->i.action;
                 mehc->i.dev_action[1]   |= sehc->i.dev_action[1];
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 947cf84e555d..c261aa0584b1 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -340,6 +340,9 @@ enum {
 
         ATA_EHI_DID_RESET       = ATA_EHI_DID_SOFTRESET | ATA_EHI_DID_HARDRESET,
 
+        /* mask of flags to transfer *to* the slave link */
+        ATA_EHI_TO_SLAVE_MASK   = ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET,
+
         /* max tries if error condition is still set after ->error_handler */
         ATA_EH_MAX_TRIES        = 5,