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scsi: esp_scsi: Clean up control flow and dead code

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This patch improves readability. There are no functional changes.

Since this touches on a questionable ESP_INTR_DC conditional, add some
commentary to help others who may (as I did) find themselves chasing an
"Invalid Command" error after the device flags this condition.

This cleanup also eliminates a warning from "make W=1":
drivers/scsi/esp_scsi.c: In function 'esp_finish_select':
drivers/scsi/esp_scsi.c:1233:5: warning: variable 'orig_select_state' set but not used [-Wunused-but-set-variable]
  u8 orig_select_state;

Tested-by: Stan Johnson <userm57@yahoo.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Finn Thain 2017-08-04 01:43:19 -04:00 committed by Martin K. Petersen
parent 7640d91d28
commit 201c37d7bf
2 changed files with 14 additions and 27 deletions
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40
drivers/scsi/esp_scsi.c
View File

@ -597,14 +597,12 @@ static int esp_alloc_lun_tag(struct esp_cmd_entry *ent,
lp->non_tagged_cmd = ent;
return 0;
} else {
/* Tagged command, see if blocked by a
* non-tagged one.
*/
if (lp->non_tagged_cmd || lp->hold)
return -EBUSY;
}
/* Tagged command. Check that it isn't blocked by a non-tagged one. */
if (lp->non_tagged_cmd || lp->hold)
return -EBUSY;
BUG_ON(lp->tagged_cmds[ent->orig_tag[1]]);
lp->tagged_cmds[ent->orig_tag[1]] = ent;
@ -1210,12 +1208,6 @@ static int esp_reconnect(struct esp *esp)
esp->active_cmd = ent;
if (ent->flags & ESP_CMD_FLAG_ABORT) {
esp->msg_out[0] = ABORT_TASK_SET;
esp->msg_out_len = 1;
scsi_esp_cmd(esp, ESP_CMD_SATN);
}
esp_event(esp, ESP_EVENT_CHECK_PHASE);
esp_restore_pointers(esp, ent);
esp->flags |= ESP_FLAG_QUICKIRQ_CHECK;
@ -1230,9 +1222,6 @@ static int esp_finish_select(struct esp *esp)
{
struct esp_cmd_entry *ent;
struct scsi_cmnd *cmd;
u8 orig_select_state;
orig_select_state = esp->select_state;
/* No longer selecting. */
esp->select_state = ESP_SELECT_NONE;
@ -1745,7 +1734,6 @@ again:
return 0;
}
goto again;
break;
case ESP_EVENT_DATA_IN:
write = 1;
@ -1956,12 +1944,14 @@ again:
} else {
if (esp->msg_out_len > 1)
esp->ops->dma_invalidate(esp);
}
if (!(esp->ireg & ESP_INTR_DC)) {
if (esp->rev != FASHME)
/* XXX if the chip went into disconnected mode,
* we can't run the phase state machine anyway.
*/
if (!(esp->ireg & ESP_INTR_DC))
scsi_esp_cmd(esp, ESP_CMD_NULL);
}
esp_event(esp, ESP_EVENT_CHECK_PHASE);
goto again;
case ESP_EVENT_MSGIN:
@ -2022,7 +2012,6 @@ again:
}
esp_schedule_reset(esp);
return 0;
break;
case ESP_EVENT_RESET:
scsi_esp_cmd(esp, ESP_CMD_RS);
@ -2033,7 +2022,6 @@ again:
"Unexpected event %x, resetting\n", esp->event);
esp_schedule_reset(esp);
return 0;
break;
}
return 1;
}
@ -2170,14 +2158,14 @@ static void __esp_interrupt(struct esp *esp)
esp_schedule_reset(esp);
} else {
if (!(esp->ireg & ESP_INTR_RSEL)) {
/* Some combination of FDONE, BSERV, DC. */
if (esp->select_state != ESP_SELECT_NONE)
intr_done = esp_finish_select(esp);
} else if (esp->ireg & ESP_INTR_RSEL) {
if (esp->ireg & ESP_INTR_RSEL) {
if (esp->active_cmd)
(void) esp_finish_select(esp);
intr_done = esp_reconnect(esp);
} else {
/* Some combination of FDONE, BSERV, DC. */
if (esp->select_state != ESP_SELECT_NONE)
intr_done = esp_finish_select(esp);
}
}
while (!intr_done)

1
drivers/scsi/esp_scsi.h
View File

@ -281,7 +281,6 @@ struct esp_cmd_entry {
u8 flags;
#define ESP_CMD_FLAG_WRITE 0x01 /* DMA is a write */
#define ESP_CMD_FLAG_ABORT 0x02 /* being aborted */
#define ESP_CMD_FLAG_AUTOSENSE 0x04 /* Doing automatic REQUEST_SENSE */
#define ESP_CMD_FLAG_RESIDUAL 0x08 /* AM53c974 BLAST residual */