[1/4] dc395x: simplify list handling

Commit Message

Christoph Hellwig Oct. 11, 2018, 2:17 p.m. UTC

Remove the list wrappers, including the pointless list iteration before
deletion.

Signed-off-by: Christoph Hellwig <[e-mail]>
---
 drivers/scsi/dc395x.c | 152 ++++++++----------------------------------
 1 file changed, 26 insertions(+), 126 deletions(-)

Patch

diff --git a/drivers/scsi/dc395x.c b/drivers/scsi/dc395x.c
index 1ed2cd82129d..8705730b2e5a 100644
--- a/drivers/scsi/dc395x.c
+++ b/drivers/scsi/dc395x.c
@@ -753,105 +753,6 @@  static inline struct ScsiReqBlk *find_cmd(struct scsi_cmnd *cmd,
 	return NULL;
 }
 
-
-static struct ScsiReqBlk *srb_get_free(struct AdapterCtlBlk *acb)
-{
-	struct list_head *head = &acb->srb_free_list;
-	struct ScsiReqBlk *srb = NULL;
-
-	if (!list_empty(head)) {
-		srb = list_entry(head->next, struct ScsiReqBlk, list);
-		list_del(head->next);
-		dprintkdbg(DBG_0, "srb_get_free: srb=%p\n", srb);
-	}
-	return srb;
-}
-
-
-static void srb_free_insert(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb)
-{
-	dprintkdbg(DBG_0, "srb_free_insert: srb=%p\n", srb);
-	list_add_tail(&srb->list, &acb->srb_free_list);
-}
-
-
-static void srb_waiting_insert(struct DeviceCtlBlk *dcb,
-		struct ScsiReqBlk *srb)
-{
-	dprintkdbg(DBG_0, "srb_waiting_insert: (0x%p) <%02i-%i> srb=%p\n",
-		srb->cmd, dcb->target_id, dcb->target_lun, srb);
-	list_add(&srb->list, &dcb->srb_waiting_list);
-}
-
-
-static void srb_waiting_append(struct DeviceCtlBlk *dcb,
-		struct ScsiReqBlk *srb)
-{
-	dprintkdbg(DBG_0, "srb_waiting_append: (0x%p) <%02i-%i> srb=%p\n",
-		 srb->cmd, dcb->target_id, dcb->target_lun, srb);
-	list_add_tail(&srb->list, &dcb->srb_waiting_list);
-}
-
-
-static void srb_going_append(struct DeviceCtlBlk *dcb, struct ScsiReqBlk *srb)
-{
-	dprintkdbg(DBG_0, "srb_going_append: (0x%p) <%02i-%i> srb=%p\n",
-		srb->cmd, dcb->target_id, dcb->target_lun, srb);
-	list_add_tail(&srb->list, &dcb->srb_going_list);
-}
-
-
-static void srb_going_remove(struct DeviceCtlBlk *dcb, struct ScsiReqBlk *srb)
-{
-	struct ScsiReqBlk *i;
-	struct ScsiReqBlk *tmp;
-	dprintkdbg(DBG_0, "srb_going_remove: (0x%p) <%02i-%i> srb=%p\n",
-		srb->cmd, dcb->target_id, dcb->target_lun, srb);
-
-	list_for_each_entry_safe(i, tmp, &dcb->srb_going_list, list)
-		if (i == srb) {
-			list_del(&srb->list);
-			break;
-		}
-}
-
-
-static void srb_waiting_remove(struct DeviceCtlBlk *dcb,
-		struct ScsiReqBlk *srb)
-{
-	struct ScsiReqBlk *i;
-	struct ScsiReqBlk *tmp;
-	dprintkdbg(DBG_0, "srb_waiting_remove: (0x%p) <%02i-%i> srb=%p\n",
-		srb->cmd, dcb->target_id, dcb->target_lun, srb);
-
-	list_for_each_entry_safe(i, tmp, &dcb->srb_waiting_list, list)
-		if (i == srb) {
-			list_del(&srb->list);
-			break;
-		}
-}
-
-
-static void srb_going_to_waiting_move(struct DeviceCtlBlk *dcb,
-		struct ScsiReqBlk *srb)
-{
-	dprintkdbg(DBG_0,
-		"srb_going_to_waiting_move: (0x%p) <%02i-%i> srb=%p\n",
-		srb->cmd, dcb->target_id, dcb->target_lun, srb);
-	list_move(&srb->list, &dcb->srb_waiting_list);
-}
-
-
-static void srb_waiting_to_going_move(struct DeviceCtlBlk *dcb,
-		struct ScsiReqBlk *srb)
-{
-	dprintkdbg(DBG_0,
-		"srb_waiting_to_going_move: (0x%p) <%02i-%i> srb=%p\n",
-		srb->cmd, dcb->target_id, dcb->target_lun, srb);
-	list_move(&srb->list, &dcb->srb_going_list);
-}
-
-
 /* Sets the timer to wake us up */
 static void waiting_set_timer(struct AdapterCtlBlk *acb, unsigned long to)
 {
@@ -923,7 +824,7 @@  static void waiting_process_next(struct AdapterCtlBlk *acb)
 
 			/* Try to send to the bus */
 			if (!start_scsi(acb, pos, srb))
-				srb_waiting_to_going_move(pos, srb);
+				list_move(&srb->list, &pos->srb_going_list);
 			else
 				waiting_set_timer(acb, HZ/50);
 			break;
@@ -960,15 +861,15 @@  static void send_srb(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb)
 	if (dcb->max_command <= list_size(&dcb->srb_going_list) ||
 	    acb->active_dcb ||
 	    (acb->acb_flag & (RESET_DETECT + RESET_DONE + RESET_DEV))) {
-		srb_waiting_append(dcb, srb);
+		list_add_tail(&srb->list, &dcb->srb_waiting_list);
 		waiting_process_next(acb);
 		return;
 	}
 
-	if (!start_scsi(acb, dcb, srb))
-		srb_going_append(dcb, srb);
-	else {
-		srb_waiting_insert(dcb, srb);
+	if (!start_scsi(acb, dcb, srb)) {
+		list_add_tail(&srb->list, &dcb->srb_going_list);
+	} else {
+		list_add(&srb->list, &dcb->srb_waiting_list);
 		waiting_set_timer(acb, HZ / 50);
 	}
 }
@@ -1116,9 +1017,9 @@  static int dc395x_queue_command_lck(struct scsi_cmnd *cmd, void (*done)(struct s
 	cmd->scsi_done = done;
 	cmd->result = 0;
 
-	srb = srb_get_free(acb);
-	if (!srb)
-	{
+	srb = list_first_entry_or_null(&acb->srb_free_list,
+			struct ScsiReqBlk, list);
+	if (!srb) {
 		/*
 		 * Return 1 since we are unable to queue this command at this
 		 * point in time.
@@ -1126,12 +1027,13 @@  static int dc395x_queue_command_lck(struct scsi_cmnd *cmd, void (*done)(struct s
 		dprintkdbg(DBG_0, "queue_command: No free srb's\n");
 		return 1;
 	}
+	list_del(&srb->list);
 
 	build_srb(cmd, dcb, srb);
 
 	if (!list_empty(&dcb->srb_waiting_list)) {
 		/* append to waiting queue */
-		srb_waiting_append(dcb, srb);
+		list_add_tail(&srb->list, &dcb->srb_waiting_list);
 		waiting_process_next(acb);
 	} else {
 		/* process immediately */
@@ -1376,11 +1278,11 @@  static int dc395x_eh_abort(struct scsi_cmnd *cmd)
 
 	srb = find_cmd(cmd, &dcb->srb_waiting_list);
 	if (srb) {
-		srb_waiting_remove(dcb, srb);
+		list_del(&srb->list);
 		pci_unmap_srb_sense(acb, srb);
 		pci_unmap_srb(acb, srb);
 		free_tag(dcb, srb);
-		srb_free_insert(acb, srb);
+		list_add_tail(&srb->list, &acb->srb_free_list);
 		dprintkl(KERN_DEBUG, "eh_abort: Command was waiting\n");
 		cmd->result = DID_ABORT << 16;
 		return SUCCESS;
@@ -3083,7 +2985,7 @@  static void disconnect(struct AdapterCtlBlk *acb)
 					goto disc1;
 				}
 				free_tag(dcb, srb);
-				srb_going_to_waiting_move(dcb, srb);
+				list_move(&srb->list, &dcb->srb_waiting_list);
 				dprintkdbg(DBG_KG,
 					"disconnect: (0x%p) Retry\n",
 					srb->cmd);
@@ -3148,7 +3050,7 @@  static void reselect(struct AdapterCtlBlk *acb)
 
 			srb->state = SRB_READY;
 			free_tag(dcb, srb);
-			srb_going_to_waiting_move(dcb, srb);
+			list_move(&srb->list, &dcb->srb_waiting_list);
 			waiting_set_timer(acb, HZ / 20);
 
 			/* return; */
@@ -3411,7 +3313,7 @@  static void srb_done(struct AdapterCtlBlk *acb, struct DeviceCtlBlk *dcb,
 				tempcnt--;
 			dcb->max_command = tempcnt;
 			free_tag(dcb, srb);
-			srb_going_to_waiting_move(dcb, srb);
+			list_move(&srb->list, &dcb->srb_waiting_list);
 			waiting_set_timer(acb, HZ / 20);
 			srb->adapter_status = 0;
 			srb->target_status = 0;
@@ -3498,14 +3400,13 @@  static void srb_done(struct AdapterCtlBlk *acb, struct DeviceCtlBlk *dcb,
 				cmd->cmnd[0], srb->total_xfer_length);
 	}
 
-	srb_going_remove(dcb, srb);
-	/* Add to free list */
-	if (srb == acb->tmp_srb)
-		dprintkl(KERN_ERR, "srb_done: ERROR! Completed cmd with tmp_srb\n");
-	else {
+	if (srb != acb->tmp_srb) {
+		/* Add to free list */
 		dprintkdbg(DBG_0, "srb_done: (0x%p) done result=0x%08x\n",
 			cmd, cmd->result);
-		srb_free_insert(acb, srb);
+		list_move_tail(&srb->list, &acb->srb_free_list);
+	} else {
+		dprintkl(KERN_ERR, "srb_done: ERROR! Completed cmd with tmp_srb\n");
 	}
 	pci_unmap_srb(acb, srb);
 
@@ -3535,9 +3436,9 @@  static void doing_srb_done(struct AdapterCtlBlk *acb, u8 did_flag,
 			result = MK_RES(0, did_flag, 0, 0);
 			printk("G:%p(%02i-%i) ", p,
 			       p->device->id, (u8)p->device->lun);
-			srb_going_remove(dcb, srb);
+			list_del(&srb->list);
 			free_tag(dcb, srb);
-			srb_free_insert(acb, srb);
+			list_add_tail(&srb->list, &acb->srb_free_list);
 			p->result = result;
 			pci_unmap_srb_sense(acb, srb);
 			pci_unmap_srb(acb, srb);
@@ -3565,8 +3466,7 @@  static void doing_srb_done(struct AdapterCtlBlk *acb, u8 did_flag,
 			result = MK_RES(0, did_flag, 0, 0);
 			printk("W:%p<%02i-%i>", p, p->device->id,
 			       (u8)p->device->lun);
-			srb_waiting_remove(dcb, srb);
-			srb_free_insert(acb, srb);
+			list_move_tail(&srb->list, &acb->srb_free_list);
 			p->result = result;
 			pci_unmap_srb_sense(acb, srb);
 			pci_unmap_srb(acb, srb);
@@ -3705,7 +3605,7 @@  static void request_sense(struct AdapterCtlBlk *acb, struct DeviceCtlBlk *dcb,
 		dprintkl(KERN_DEBUG,
 			"request_sense: (0x%p) failed <%02i-%i>\n",
 			srb->cmd, dcb->target_id, dcb->target_lun);
-		srb_going_to_waiting_move(dcb, srb);
+		list_move(&srb->list, &dcb->srb_waiting_list);
 		waiting_set_timer(acb, HZ / 100);
 	}
 }
@@ -4392,7 +4292,7 @@  static void adapter_init_params(struct AdapterCtlBlk *acb)
 	
 	/* link static array of srbs into the srb free list */
 	for (i = 0; i < acb->srb_count - 1; i++)
-		srb_free_insert(acb, &acb->srb_array[i]);
+		list_add_tail(&acb->srb_array[i].list, &acb->srb_free_list);
 }