xen-scsiback: define a pr_fmt macro with xen-pvscsi

Add the {xen-pvscsi: } prefix in pr_fmt and remove DPRINTK, then
replace all DPRINTK with pr_debug.

Also fixed up some comments just as eliminate redundant whitespace
and format the code.

These will make the code easier to read.

Signed-off-by: Tao Chen <boby.chen@huawei.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>

1 files changed, 36 insertions, 39 deletions

diff --git a/drivers/xen/xen-scsiback.c b/drivers/xen/xen-scsiback.c
index 9faca6a60bb0..d0b0bc549355 100644
--- a/drivers/xen/xen-scsiback.c
+++ b/drivers/xen/xen-scsiback.c
@@ -31,6 +31,8 @@
  * IN THE SOFTWARE.
  */
 
+#define pr_fmt(fmt) "xen-pvscsi: " fmt
+
 #include <stdarg.h>
 
 #include <linux/module.h>
@@ -69,9 +71,6 @@
 #include <xen/interface/grant_table.h>
 #include <xen/interface/io/vscsiif.h>
 
-#define DPRINTK(_f, _a...)                      \
-        pr_debug("(file=%s, line=%d) " _f, __FILE__ , __LINE__ , ## _a)
-
 #define VSCSI_VERSION   "v0.1"
 #define VSCSI_NAMELEN   32
 
@@ -271,7 +270,7 @@ static void scsiback_print_status(char *sense_buffer, int errors,
 {
         struct scsiback_tpg *tpg = pending_req->v2p->tpg;
 
-        pr_err("xen-pvscsi[%s:%d] cmnd[0]=%02x -> st=%02x msg=%02x host=%02x drv=%02x\n",
+        pr_err("[%s:%d] cmnd[0]=%02x -> st=%02x msg=%02x host=%02x drv=%02x\n",
                tpg->tport->tport_name, pending_req->v2p->lun,
                pending_req->cmnd[0], status_byte(errors), msg_byte(errors),
                host_byte(errors), driver_byte(errors));
@@ -427,7 +426,7 @@ static int scsiback_gnttab_data_map_batch(struct gnttab_map_grant_ref *map,
         BUG_ON(err);
         for (i = 0; i < cnt; i++) {
                 if (unlikely(map[i].status != GNTST_okay)) {
-                        pr_err("xen-pvscsi: invalid buffer -- could not remap it\n");
+                        pr_err("invalid buffer -- could not remap it\n");
                         map[i].handle = SCSIBACK_INVALID_HANDLE;
                         err = -ENOMEM;
                 } else {
@@ -449,7 +448,7 @@ static int scsiback_gnttab_data_map_list(struct vscsibk_pend *pending_req,
         for (i = 0; i < cnt; i++) {
                 if (get_free_page(pg + mapcount)) {
                         put_free_pages(pg, mapcount);
-                        pr_err("xen-pvscsi: no grant page\n");
+                        pr_err("no grant page\n");
                         return -ENOMEM;
                 }
                 gnttab_set_map_op(&map[mapcount], vaddr_page(pg[mapcount]),
@@ -492,7 +491,7 @@ static int scsiback_gnttab_data_map(struct vscsiif_request *ring_req,
                 return 0;
 
         if (nr_segments > VSCSIIF_SG_TABLESIZE) {
-                DPRINTK("xen-pvscsi: invalid parameter nr_seg = %d\n",
+                pr_debug("invalid parameter nr_seg = %d\n",
                         ring_req->nr_segments);
                 return -EINVAL;
         }
@@ -516,13 +515,12 @@ static int scsiback_gnttab_data_map(struct vscsiif_request *ring_req,
                         nr_segments += n_segs;
                 }
                 if (nr_segments > SG_ALL) {
-                        DPRINTK("xen-pvscsi: invalid nr_seg = %d\n",
-                                nr_segments);
+                        pr_debug("invalid nr_seg = %d\n", nr_segments);
                         return -EINVAL;
                 }
         }
 
-        /* free of (sgl) in fast_flush_area()*/
+        /* free of (sgl) in fast_flush_area() */
         pending_req->sgl = kmalloc_array(nr_segments,
                                         sizeof(struct scatterlist), GFP_KERNEL);
         if (!pending_req->sgl)
@@ -679,7 +677,8 @@ static int prepare_pending_reqs(struct vscsibk_info *info,
         v2p = scsiback_do_translation(info, &vir);
         if (!v2p) {
                 pending_req->v2p = NULL;
-                DPRINTK("xen-pvscsi: doesn't exist.\n");
+                pr_debug("the v2p of (chn:%d, tgt:%d, lun:%d) doesn't exist.\n",
+                        vir.chn, vir.tgt, vir.lun);
                 return -ENODEV;
         }
         pending_req->v2p = v2p;
@@ -690,14 +689,14 @@ static int prepare_pending_reqs(struct vscsibk_info *info,
                 (pending_req->sc_data_direction != DMA_TO_DEVICE) &&
                 (pending_req->sc_data_direction != DMA_FROM_DEVICE) &&
                 (pending_req->sc_data_direction != DMA_NONE)) {
-                DPRINTK("xen-pvscsi: invalid parameter data_dir = %d\n",
+                pr_debug("invalid parameter data_dir = %d\n",
                         pending_req->sc_data_direction);
                 return -EINVAL;
         }
 
         pending_req->cmd_len = ring_req->cmd_len;
         if (pending_req->cmd_len > VSCSIIF_MAX_COMMAND_SIZE) {
-                DPRINTK("xen-pvscsi: invalid parameter cmd_len = %d\n",
+                pr_debug("invalid parameter cmd_len = %d\n",
                         pending_req->cmd_len);
                 return -EINVAL;
         }
@@ -721,7 +720,7 @@ static int scsiback_do_cmd_fn(struct vscsibk_info *info)
 
         if (RING_REQUEST_PROD_OVERFLOW(ring, rp)) {
                 rc = ring->rsp_prod_pvt;
-                pr_warn("xen-pvscsi: Dom%d provided bogus ring requests (%#x - %#x = %u). Halting ring processing\n",
+                pr_warn("Dom%d provided bogus ring requests (%#x - %#x = %u). Halting ring processing\n",
                            info->domid, rp, rc, rp - rc);
                 info->ring_error = 1;
                 return 0;
@@ -772,7 +771,7 @@ static int scsiback_do_cmd_fn(struct vscsibk_info *info)
                         scsiback_device_action(pending_req, TMR_LUN_RESET, 0);
                         break;
                 default:
-                        pr_err_ratelimited("xen-pvscsi: invalid request\n");
+                        pr_err_ratelimited("invalid request\n");
                         scsiback_do_resp_with_sense(NULL, DRIVER_ERROR << 24,
                                                     0, pending_req);
                         kmem_cache_free(scsiback_cachep, pending_req);
@@ -874,14 +873,13 @@ static int scsiback_add_translation_entry(struct vscsibk_info *info,
 
         lunp = strrchr(phy, ':');
         if (!lunp) {
-                pr_err("xen-pvscsi: illegal format of physical device %s\n",
-                        phy);
+                pr_err("illegal format of physical device %s\n", phy);
                 return -EINVAL;
         }
         *lunp = 0;
         lunp++;
         if (kstrtouint(lunp, 10, &lun) || lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
-                pr_err("xen-pvscsi: lun number not valid: %s\n", lunp);
+                pr_err("lun number not valid: %s\n", lunp);
                 return -EINVAL;
         }
 
@@ -909,7 +907,7 @@ static int scsiback_add_translation_entry(struct vscsibk_info *info,
         mutex_unlock(&scsiback_mutex);
 
         if (!tpg) {
-                pr_err("xen-pvscsi: %s:%d %s\n", phy, lun, error);
+                pr_err("%s:%d %s\n", phy, lun, error);
                 return -ENODEV;
         }
 
@@ -926,7 +924,7 @@ static int scsiback_add_translation_entry(struct vscsibk_info *info,
                 if ((entry->v.chn == v->chn) &&
                     (entry->v.tgt == v->tgt) &&
                     (entry->v.lun == v->lun)) {
-                        pr_warn("xen-pvscsi: Virtual ID is already used. Assignment was not performed.\n");
+                        pr_warn("Virtual ID is already used. Assignment was not performed.\n");
                         err = -EEXIST;
                         goto out;
                 }
@@ -997,7 +995,7 @@ static void scsiback_do_add_lun(struct vscsibk_info *info, const char *state,
         if (!scsiback_add_translation_entry(info, phy, vir)) {
                 if (xenbus_printf(XBT_NIL, info->dev->nodename, state,
                                   "%d", XenbusStateInitialised)) {
-                        pr_err("xen-pvscsi: xenbus_printf error %s\n", state);
+                        pr_err("xenbus_printf error %s\n", state);
                         scsiback_del_translation_entry(info, vir);
                 }
         } else {
@@ -1012,7 +1010,7 @@ static void scsiback_do_del_lun(struct vscsibk_info *info, const char *state,
         if (!scsiback_del_translation_entry(info, vir)) {
                 if (xenbus_printf(XBT_NIL, info->dev->nodename, state,
                                   "%d", XenbusStateClosed))
-                        pr_err("xen-pvscsi: xenbus_printf error %s\n", state);
+                        pr_err("xenbus_printf error %s\n", state);
         }
 }
 
@@ -1071,15 +1069,14 @@ static void scsiback_do_1lun_hotplug(struct vscsibk_info *info, int op,
                         /* modify vscsi-devs/dev-x/state */
                         if (xenbus_printf(XBT_NIL, dev->nodename, state,
                                           "%d", XenbusStateConnected)) {
-                                pr_err("xen-pvscsi: xenbus_printf error %s\n",
-                                       str);
+                                pr_err("xenbus_printf error %s\n", str);
                                 scsiback_del_translation_entry(info, &vir);
                                 xenbus_printf(XBT_NIL, dev->nodename, state,
                                               "%d", XenbusStateClosed);
                         }
                 }
                 break;
-        /*When it is necessary, processing is added here.*/
+        /* When it is necessary, processing is added here. */
         default:
                 break;
         }
@@ -1196,7 +1193,7 @@ static int scsiback_probe(struct xenbus_device *dev,
         struct vscsibk_info *info = kzalloc(sizeof(struct vscsibk_info),
                                             GFP_KERNEL);
 
-        DPRINTK("%p %d\n", dev, dev->otherend_id);
+        pr_debug("%s %p %d\n", __func__, dev, dev->otherend_id);
 
         if (!info) {
                 xenbus_dev_fatal(dev, -ENOMEM, "allocating backend structure");
@@ -1227,7 +1224,7 @@ static int scsiback_probe(struct xenbus_device *dev,
         return 0;
 
 fail:
-        pr_warn("xen-pvscsi: %s failed\n", __func__);
+        pr_warn("%s failed\n", __func__);
         scsiback_remove(dev);
 
         return err;
@@ -1432,7 +1429,7 @@ check_len:
         }
         snprintf(&tport->tport_name[0], VSCSI_NAMELEN, "%s", &name[off]);
 
-        pr_debug("xen-pvscsi: Allocated emulated Target %s Address: %s\n",
+        pr_debug("Allocated emulated Target %s Address: %s\n",
                  scsiback_dump_proto_id(tport), name);
 
         return &tport->tport_wwn;
@@ -1443,7 +1440,7 @@ static void scsiback_drop_tport(struct se_wwn *wwn)
         struct scsiback_tport *tport = container_of(wwn,
                                 struct scsiback_tport, tport_wwn);
 
-        pr_debug("xen-pvscsi: Deallocating emulated Target %s Address: %s\n",
+        pr_debug("Deallocating emulated Target %s Address: %s\n",
                  scsiback_dump_proto_id(tport), tport->tport_name);
 
         kfree(tport);
@@ -1470,8 +1467,8 @@ static u32 scsiback_tpg_get_inst_index(struct se_portal_group *se_tpg)
 static int scsiback_check_stop_free(struct se_cmd *se_cmd)
 {
         /*
-         * Do not release struct se_cmd's containing a valid TMR
-         * pointer.  These will be released directly in scsiback_device_action()
+         * Do not release struct se_cmd's containing a valid TMR pointer.
+         * These will be released directly in scsiback_device_action()
          * with transport_generic_free_cmd().
          */
         if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
@@ -1637,7 +1634,7 @@ static int scsiback_make_nexus(struct scsiback_tpg *tpg,
                 return -ENOMEM;
         }
         /*
-         *  Initialize the struct se_session pointer
+         * Initialize the struct se_session pointer
          */
         tv_nexus->tvn_se_sess = transport_init_session(TARGET_PROT_NORMAL);
         if (IS_ERR(tv_nexus->tvn_se_sess)) {
@@ -1708,7 +1705,7 @@ static int scsiback_drop_nexus(struct scsiback_tpg *tpg)
                 return -EBUSY;
         }
 
-        pr_debug("xen-pvscsi: Removing I_T Nexus to emulated %s Initiator Port: %s\n",
+        pr_debug("Removing I_T Nexus to emulated %s Initiator Port: %s\n",
                 scsiback_dump_proto_id(tpg->tport),
                 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
 
@@ -1754,7 +1751,7 @@ static ssize_t scsiback_tpg_store_nexus(struct se_portal_group *se_tpg,
         unsigned char i_port[VSCSI_NAMELEN], *ptr, *port_ptr;
         int ret;
         /*
-         * Shutdown the active I_T nexus if 'NULL' is passed..
+         * Shutdown the active I_T nexus if 'NULL' is passed.
          */
         if (!strncmp(page, "NULL", 4)) {
                 ret = scsiback_drop_nexus(tpg);
@@ -1925,7 +1922,7 @@ static void scsiback_drop_tpg(struct se_portal_group *se_tpg)
          */
         scsiback_drop_nexus(tpg);
         /*
-         * Deregister the se_tpg from TCM..
+         * Deregister the se_tpg from TCM.
          */
         core_tpg_deregister(se_tpg);
         kfree(tpg);
@@ -1995,7 +1992,7 @@ static int scsiback_register_configfs(void)
         struct target_fabric_configfs *fabric;
         int ret;
 
-        pr_debug("xen-pvscsi: fabric module %s on %s/%s on "UTS_RELEASE"\n",
+        pr_debug("fabric module %s on %s/%s on "UTS_RELEASE"\n",
                  VSCSI_VERSION, utsname()->sysname, utsname()->machine);
         /*
          * Register the top level struct config_item_type with TCM core
@@ -2032,7 +2029,7 @@ static int scsiback_register_configfs(void)
          * Setup our local pointer to *fabric
          */
         scsiback_fabric_configfs = fabric;
-        pr_debug("xen-pvscsi: Set fabric -> scsiback_fabric_configfs\n");
+        pr_debug("Set fabric -> scsiback_fabric_configfs\n");
         return 0;
 };
 
@@ -2043,7 +2040,7 @@ static void scsiback_deregister_configfs(void)
 
         target_fabric_configfs_deregister(scsiback_fabric_configfs);
         scsiback_fabric_configfs = NULL;
-        pr_debug("xen-pvscsi: Cleared scsiback_fabric_configfs\n");
+        pr_debug("Cleared scsiback_fabric_configfs\n");
 };
 
 static const struct xenbus_device_id scsiback_ids[] = {
@@ -2094,7 +2091,7 @@ out_unregister_xenbus:
         xenbus_unregister_driver(&scsiback_driver);
 out_cache_destroy:
         kmem_cache_destroy(scsiback_cachep);
-        pr_err("xen-pvscsi: %s: error %d\n", __func__, ret);
+        pr_err("%s: error %d\n", __func__, ret);
         return ret;
 }