[SCSI] libsas: async ata-eh

Once sas_ata_hard_reset() starts honoring the 'deadline' parameter a
pathological configuration could take 25 seconds per ata device
(serialized) to recover.  Run per-port recoveries in parallel.

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

diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c
index 03930a0..4beca66 100644 (file)
--- a/drivers/scsi/libsas/sas_ata.c
+++ b/drivers/scsi/libsas/sas_ata.c
@@ -23,6 +23,7 @@
 
 #include <linux/scatterlist.h>
 #include <linux/slab.h>
+#include <linux/async.h>
 
 #include <scsi/sas_ata.h>
 #include "sas_internal.h"
@@ -605,10 +606,21 @@ int sas_discover_sata(struct domain_device *dev)
        return 0;
 }
 
+static void async_sas_ata_eh(void *data, async_cookie_t cookie)
+{
+       struct domain_device *dev = data;
+       struct ata_port *ap = dev->sata_dev.ap;
+       struct sas_ha_struct *ha = dev->port->ha;
+
+       ata_port_printk(ap, KERN_DEBUG, "sas eh calling libata port error handler");
+       ata_scsi_port_error_handler(ha->core.shost, ap);
+}
+
 void sas_ata_strategy_handler(struct Scsi_Host *shost)
 {
        struct scsi_device *sdev;
        struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
+       LIST_HEAD(async);
 
        /* it's ok to defer revalidation events during ata eh, these
         * disks are in one of three states:
@@ -622,14 +634,13 @@ void sas_ata_strategy_handler(struct Scsi_Host *shost)
 
        shost_for_each_device(sdev, shost) {
                struct domain_device *ddev = sdev_to_domain_dev(sdev);
-               struct ata_port *ap = ddev->sata_dev.ap;
 
                if (!dev_is_sata(ddev))
                        continue;
 
-               ata_port_printk(ap, KERN_DEBUG, "sas eh calling libata port error handler");
-               ata_scsi_port_error_handler(shost, ap);
+               async_schedule_domain(async_sas_ata_eh, ddev, &async);
        }
+       async_synchronize_full_domain(&async);
 
        sas_enable_revalidation(sas_ha);
 }