[SCSI] libsas: perform sas-transport resets in shost->workq context

Extend the sas transport class to allow transport users to attach extra
data to a sas_phy (->hostdata).  Use this area in libsas to move resets
to workq context in preparation for scheduling ata device resets through
libata-eh.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 17 insertions, 1 deletions

diff --git a/drivers/scsi/scsi_transport_sas.c b/drivers/scsi/scsi_transport_sas.c
index 9421bae8af1a..ab3bd0b5ffd9 100644
--- a/drivers/scsi/scsi_transport_sas.c
+++ b/drivers/scsi/scsi_transport_sas.c
@@ -652,9 +652,21 @@ sas_phy_linkerror_attr(running_disparity_error_count);
 sas_phy_linkerror_attr(loss_of_dword_sync_count);
 sas_phy_linkerror_attr(phy_reset_problem_count);
 
+static int sas_phy_setup(struct transport_container *tc, struct device *dev,
+                         struct device *cdev)
+{
+        struct sas_phy *phy = dev_to_phy(dev);
+        struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
+        struct sas_internal *i = to_sas_internal(shost->transportt);
+
+        if (i->f->phy_setup)
+                i->f->phy_setup(phy);
+
+        return 0;
+}
 
 static DECLARE_TRANSPORT_CLASS(sas_phy_class,
-                "sas_phy", NULL, NULL, NULL);
+                "sas_phy", sas_phy_setup, NULL, NULL);
 
 static int sas_phy_match(struct attribute_container *cont, struct device *dev)
 {
@@ -678,7 +690,11 @@ static int sas_phy_match(struct attribute_container *cont, struct device *dev)
 static void sas_phy_release(struct device *dev)
 {
         struct sas_phy *phy = dev_to_phy(dev);
+        struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
+        struct sas_internal *i = to_sas_internal(shost->transportt);
 
+        if (i->f->phy_release)
+                i->f->phy_release(phy);
         put_device(dev->parent);
         kfree(phy);
 }