diff options
author | Finn Thain <fthain@telegraphics.com.au> | 2018-10-16 16:31:25 +1100 |
---|---|---|
committer | Martin K. Petersen <martin.petersen@oracle.com> | 2018-10-17 21:37:31 -0400 |
commit | 8bca2143335116af838305440d94539367382555 (patch) | |
tree | 81997190f787438ac2cb91981f2888f9a1d35f0e /drivers/scsi/esp_scsi.c | |
parent | 87c58ef5a57f46b1d78117317a7d8806ad16f404 (diff) |
scsi: esp_scsi: Eliminate ESP_FLAG_DOING_SLOWCMD
The concept of a 'slow command' as it appears in esp_scsi is confusing
because it could refer to an ESP command or a SCSI command. It turns out
that it refers to a particular ESP select command which the driver also
tracks as 'ESP_SELECT_MSGOUT'. For readability, it is better to use the
terminology from the datasheets.
The global ESP_FLAG_DOING_SLOWCMD flag is redundant anyway, as it can be
inferred from esp->select_state. Remove the ESP_FLAG_DOING_SLOWCMD cruft
and just use a boolean local variable.
Tested-by: Stan Johnson <userm57@yahoo.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Tested-by: Michael Schmitz <schmitzmic@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/esp_scsi.c')
-rw-r--r-- | drivers/scsi/esp_scsi.c | 57 |
1 files changed, 23 insertions, 34 deletions
diff --git a/drivers/scsi/esp_scsi.c b/drivers/scsi/esp_scsi.c index 692461443103..752857dc6437 100644 --- a/drivers/scsi/esp_scsi.c +++ b/drivers/scsi/esp_scsi.c @@ -482,17 +482,6 @@ static void esp_restore_pointers(struct esp *esp, struct esp_cmd_entry *ent) spriv->tot_residue = ent->saved_tot_residue; } -static void esp_check_command_len(struct esp *esp, struct scsi_cmnd *cmd) -{ - if (cmd->cmd_len == 6 || - cmd->cmd_len == 10 || - cmd->cmd_len == 12) { - esp->flags &= ~ESP_FLAG_DOING_SLOWCMD; - } else { - esp->flags |= ESP_FLAG_DOING_SLOWCMD; - } -} - static void esp_write_tgt_config3(struct esp *esp, int tgt) { if (esp->rev > ESP100A) { @@ -739,6 +728,7 @@ static void esp_maybe_execute_command(struct esp *esp) struct scsi_device *dev; struct scsi_cmnd *cmd; struct esp_cmd_entry *ent; + bool select_and_stop = false; int tgt, lun, i; u32 val, start_cmd; u8 *p; @@ -769,7 +759,8 @@ static void esp_maybe_execute_command(struct esp *esp) esp_map_dma(esp, cmd); esp_save_pointers(esp, ent); - esp_check_command_len(esp, cmd); + if (!(cmd->cmd_len == 6 || cmd->cmd_len == 10 || cmd->cmd_len == 12)) + select_and_stop = true; p = esp->command_block; @@ -810,9 +801,9 @@ static void esp_maybe_execute_command(struct esp *esp) tp->flags &= ~ESP_TGT_CHECK_NEGO; } - /* Process it like a slow command. */ - if (tp->flags & (ESP_TGT_NEGO_WIDE | ESP_TGT_NEGO_SYNC)) - esp->flags |= ESP_FLAG_DOING_SLOWCMD; + /* If there are multiple message bytes, use Select and Stop */ + if (esp->msg_out_len) + select_and_stop = true; } build_identify: @@ -822,23 +813,10 @@ build_identify: /* ESP100 lacks select w/atn3 command, use select * and stop instead. */ - esp->flags |= ESP_FLAG_DOING_SLOWCMD; + select_and_stop = true; } - if (!(esp->flags & ESP_FLAG_DOING_SLOWCMD)) { - start_cmd = ESP_CMD_SELA; - if (ent->tag[0]) { - *p++ = ent->tag[0]; - *p++ = ent->tag[1]; - - start_cmd = ESP_CMD_SA3; - } - - for (i = 0; i < cmd->cmd_len; i++) - *p++ = cmd->cmnd[i]; - - esp->select_state = ESP_SELECT_BASIC; - } else { + if (select_and_stop) { esp->cmd_bytes_left = cmd->cmd_len; esp->cmd_bytes_ptr = &cmd->cmnd[0]; @@ -853,6 +831,19 @@ build_identify: start_cmd = ESP_CMD_SELAS; esp->select_state = ESP_SELECT_MSGOUT; + } else { + start_cmd = ESP_CMD_SELA; + if (ent->tag[0]) { + *p++ = ent->tag[0]; + *p++ = ent->tag[1]; + + start_cmd = ESP_CMD_SA3; + } + + for (i = 0; i < cmd->cmd_len; i++) + *p++ = cmd->cmnd[i]; + + esp->select_state = ESP_SELECT_BASIC; } val = tgt; if (esp->rev == FASHME) @@ -1260,7 +1251,6 @@ static int esp_finish_select(struct esp *esp) esp_unmap_dma(esp, cmd); esp_free_lun_tag(ent, cmd->device->hostdata); tp->flags &= ~(ESP_TGT_NEGO_SYNC | ESP_TGT_NEGO_WIDE); - esp->flags &= ~ESP_FLAG_DOING_SLOWCMD; esp->cmd_bytes_ptr = NULL; esp->cmd_bytes_left = 0; } else { @@ -1308,9 +1298,8 @@ static int esp_finish_select(struct esp *esp) esp_flush_fifo(esp); } - /* If we are doing a slow command, negotiation, etc. - * we'll do the right thing as we transition to the - * next phase. + /* If we are doing a Select And Stop command, negotiation, etc. + * we'll do the right thing as we transition to the next phase. */ esp_event(esp, ESP_EVENT_CHECK_PHASE); return 0; |