1 files changed, 9 insertions, 2 deletions

diff --git a/include/linux/libata.h b/include/linux/libata.h
index 91f705de2c0b..fc03efa64ffe 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -823,10 +823,10 @@ struct ata_port {
         unsigned int            cbl;    /* cable type; ATA_CBL_xxx */
 
         struct ata_queued_cmd   qcmd[ATA_MAX_QUEUE];
-        unsigned long           qc_allocated;
+        unsigned long           sas_tag_allocated; /* for sas tag allocation only */
         unsigned int            qc_active;
         int                     nr_active_links; /* #links with active qcs */
-        unsigned int            last_tag;       /* track next tag hw expects */
+        unsigned int            sas_last_tag;   /* track next tag hw expects */
 
         struct ata_link         link;           /* host default link */
         struct ata_link         *slave_link;    /* see ata_slave_link_init() */
@@ -1340,12 +1340,19 @@ extern const struct ata_port_operations ata_base_port_ops;
 extern const struct ata_port_operations sata_port_ops;
 extern struct device_attribute *ata_common_sdev_attrs[];
 
+/*
+ * All sht initializers (BASE, PIO, BMDMA, NCQ) must be instantiated
+ * by the edge drivers.  Because the 'module' field of sht must be the
+ * edge driver's module reference, otherwise the driver can be unloaded
+ * even if the scsi_device is being accessed.
+ */
 #define ATA_BASE_SHT(drv_name)                                  \
         .module                 = THIS_MODULE,                  \
         .name                   = drv_name,                     \
         .ioctl                  = ata_scsi_ioctl,               \
         .queuecommand           = ata_scsi_queuecmd,            \
         .can_queue              = ATA_DEF_QUEUE,                \
+        .tag_alloc_policy       = BLK_TAG_ALLOC_RR,             \
         .this_id                = ATA_SHT_THIS_ID,              \
         .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,          \
         .emulated               = ATA_SHT_EMULATED,             \