lkml.org 
[lkml]   [2022]   [Jan]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v3] ata: libata-scsi: simplify __ata_scsi_queuecmd()
Date
This is just a clean code. Since each branch of "if" state would check
scmd->cmd_len, so move the check of scmd->cmd_len out of "if" state to
simplify parameters check.

After the check of scmd->cmd_len is out of "if" state, we can remove
one redundant "if" state.

Remove a redundant variable "rc" by hand.

This patch do not change origin function logic.

Signed-off-by: Wenchao Hao <haowenchao@huawei.com>
---
drivers/ata/libata-scsi.c | 45 ++++++++++++++++++---------------------
1 file changed, 21 insertions(+), 24 deletions(-)

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index a16ef0030..ed8be585a 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -3958,42 +3958,39 @@ int __ata_scsi_queuecmd(struct scsi_cmnd *scmd, struct ata_device *dev)
{
u8 scsi_op = scmd->cmnd[0];
ata_xlat_func_t xlat_func;
- int rc = 0;
+
+ if (unlikely(!scmd->cmd_len))
+ goto bad_cdb_len;

if (dev->class == ATA_DEV_ATA || dev->class == ATA_DEV_ZAC) {
- if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len))
+ if (unlikely(scmd->cmd_len > dev->cdb_len))
goto bad_cdb_len;

xlat_func = ata_get_xlat_func(dev, scsi_op);
- } else {
- if (unlikely(!scmd->cmd_len))
- goto bad_cdb_len;
+ } else if (likely((scsi_op != ATA_16) || !atapi_passthru16)) {
+ /* relay SCSI command to ATAPI device */
+ int len = COMMAND_SIZE(scsi_op);

- xlat_func = NULL;
- if (likely((scsi_op != ATA_16) || !atapi_passthru16)) {
- /* relay SCSI command to ATAPI device */
- int len = COMMAND_SIZE(scsi_op);
- if (unlikely(len > scmd->cmd_len ||
- len > dev->cdb_len ||
- scmd->cmd_len > ATAPI_CDB_LEN))
- goto bad_cdb_len;
+ if (unlikely(len > scmd->cmd_len ||
+ len > dev->cdb_len ||
+ scmd->cmd_len > ATAPI_CDB_LEN))
+ goto bad_cdb_len;

- xlat_func = atapi_xlat;
- } else {
- /* ATA_16 passthru, treat as an ATA command */
- if (unlikely(scmd->cmd_len > 16))
- goto bad_cdb_len;
+ xlat_func = atapi_xlat;
+ } else {
+ /* ATA_16 passthru, treat as an ATA command */
+ if (unlikely(scmd->cmd_len > 16))
+ goto bad_cdb_len;

- xlat_func = ata_get_xlat_func(dev, scsi_op);
- }
+ xlat_func = ata_get_xlat_func(dev, scsi_op);
}

if (xlat_func)
- rc = ata_scsi_translate(dev, scmd, xlat_func);
- else
- ata_scsi_simulate(dev, scmd);
+ return ata_scsi_translate(dev, scmd, xlat_func);

- return rc;
+ ata_scsi_simulate(dev, scmd);
+
+ return 0;

bad_cdb_len:
scmd->result = DID_ERROR << 16;
--
2.32.0
\
 
 \ /
  Last update: 2022-01-05 12:05    [W:0.650 / U:0.540 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site