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scsi: dc395x: simplify list handling

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

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Christoph Hellwig 2018-10-11 16:17:13 +02:00 committed by Martin K. Petersen
parent 7726618639
commit cd29660dc8
1 changed files with 26 additions and 126 deletions
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152
drivers/scsi/dc395x.c
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@ -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);
}